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<li class="navelem"><a class="el" href="dir_a62226f9e3a6c7c5a3be455e2f87ae01.html">xrpld</a></li><li class="navelem"><a class="el" href="dir_c69db3203fa08a9ff994909ba6ee9783.html">app</a></li><li class="navelem"><a class="el" href="dir_2860c73e71f9ef894ba4acb1eeae5483.html">misc</a></li> </ul>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">//------------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">/*</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> This file is part of rippled: https://github.com/ripple/rippled</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> Copyright (c) 2023 Ripple Labs Inc.</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"></span> </div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> Permission to use, copy, modify, and/or distribute this software for any</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> purpose with or without fee is hereby granted, provided that the above</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> copyright notice and this permission notice appear in all copies.</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"></span> </div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"> OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment">*/</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment">//==============================================================================</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> </div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#ifndef RIPPLE_APP_MISC_AMMHELPERS_H_INCLUDED</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#define RIPPLE_APP_MISC_AMMHELPERS_H_INCLUDED</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="preprocessor">#include &lt;xrpl/basics/Log.h&gt;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include &lt;xrpl/basics/Number.h&gt;</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#include &lt;xrpl/beast/utility/Journal.h&gt;</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="preprocessor">#include &lt;xrpl/protocol/AMMCore.h&gt;</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="preprocessor">#include &lt;xrpl/protocol/AmountConversions.h&gt;</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#include &lt;xrpl/protocol/Feature.h&gt;</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="preprocessor">#include &lt;xrpl/protocol/IOUAmount.h&gt;</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#include &lt;xrpl/protocol/Issue.h&gt;</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#include &lt;xrpl/protocol/Quality.h&gt;</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="preprocessor">#include &lt;xrpl/protocol/Rules.h&gt;</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="preprocessor">#include &lt;xrpl/protocol/STAmount.h&gt;</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceripple.html">ripple</a> {</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="keyword">namespace </span>detail {</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span>Number</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"><a class="line" href="namespaceripple_1_1detail.html#ad2407266f6fb0fccc12032875b2cbb01"> 40</a></span><a class="code hl_function" href="namespaceripple_1_1detail.html#ad2407266f6fb0fccc12032875b2cbb01">reduceOffer</a>(<span class="keyword">auto</span> <span class="keyword">const</span>&amp; amount)</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span>{</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keyword">static</span> <a class="code hl_class" href="classripple_1_1Number.html">Number</a> <span class="keyword">const</span> reducedOfferPct(9999, -4);</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="comment">// Make sure the result is always less than amount or zero.</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <a class="code hl_class" href="classripple_1_1NumberRoundModeGuard.html">NumberRoundModeGuard</a> mg(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534afed3119e1980867324d399f42cbf548d">Number::towards_zero</a>);</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keywordflow">return</span> amount * reducedOfferPct;</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span>}</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span>} <span class="comment">// namespace detail</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span>STAmount</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span><a class="code hl_function" href="namespaceripple.html#ab8defa1f235abbf44a60ccc6c71c6fdd">ammLPTokens</a>(</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> STAmount <span class="keyword">const</span>&amp; asset1,</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> STAmount <span class="keyword">const</span>&amp; asset2,</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> Issue <span class="keyword">const</span>&amp; lptIssue);</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> </div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span>STAmount</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><a class="code hl_function" href="namespaceripple.html#a0b2344222057d8b5b9923b2911962879">lpTokensIn</a>(</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> STAmount <span class="keyword">const</span>&amp; asset1Balance,</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> STAmount <span class="keyword">const</span>&amp; asset1Deposit,</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> STAmount <span class="keyword">const</span>&amp; lptAMMBalance,</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a> tfee);</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> </div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span>STAmount</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span><a class="code hl_function" href="namespaceripple.html#a573eb2cecf652856fc74fb1dfbaf8c2a">ammAssetIn</a>(</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> STAmount <span class="keyword">const</span>&amp; asset1Balance,</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> STAmount <span class="keyword">const</span>&amp; lptAMMBalance,</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> STAmount <span class="keyword">const</span>&amp; lpTokens,</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a> tfee);</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span>STAmount</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span><a class="code hl_function" href="namespaceripple.html#a4c964d1f7629a28f9b916e2d25b39bcd">lpTokensOut</a>(</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> STAmount <span class="keyword">const</span>&amp; asset1Balance,</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> STAmount <span class="keyword">const</span>&amp; asset1Withdraw,</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> STAmount <span class="keyword">const</span>&amp; lptAMMBalance,</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a> tfee);</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> </div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span>STAmount</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span><a class="code hl_function" href="namespaceripple.html#aea4620f7a5356019edee3be624729c6d">withdrawByTokens</a>(</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> STAmount <span class="keyword">const</span>&amp; assetBalance,</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> STAmount <span class="keyword">const</span>&amp; lptAMMBalance,</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> STAmount <span class="keyword">const</span>&amp; lpTokens,</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a> tfee);</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> </div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span><span class="keyword">inline</span> <span class="keywordtype">bool</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"><a class="line" href="namespaceripple.html#aea954383230f579cb080646b898088a5"> 127</a></span><a class="code hl_function" href="namespaceripple.html#aea954383230f579cb080646b898088a5">withinRelativeDistance</a>(</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> Quality <span class="keyword">const</span>&amp; calcQuality,</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> Quality <span class="keyword">const</span>&amp; reqQuality,</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <a class="code hl_class" href="classripple_1_1Number.html">Number</a> <span class="keyword">const</span>&amp; dist)</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span>{</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> <span class="keywordflow">if</span> (calcQuality == reqQuality)</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> <span class="keyword">auto</span> <span class="keyword">const</span> [min, max] = <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/minmax.html">std::minmax</a>(calcQuality, reqQuality);</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="comment">// Relative distance is (max - min)/max. Can&#39;t use basic operations</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> <span class="comment">// on Quality. Have to use Quality::rate() instead, which</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> <span class="comment">// is inverse of quality: (1/max.rate - 1/min.rate)/(1/max.rate)</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> <span class="keywordflow">return</span> ((min.rate() - max.rate()) / min.rate()) &lt; dist;</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span>}</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> </div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span><span class="comment">// clang-format off</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Amt&gt;</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> <span class="keyword">requires</span>(</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> std::is_same_v&lt;Amt, STAmount&gt; || std::is_same_v&lt;Amt, IOUAmount&gt; ||</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> std::is_same_v&lt;Amt, XRPAmount&gt; || std::is_same_v&lt;Amt, Number&gt;)</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span><span class="keywordtype">bool</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"><a class="line" href="namespaceripple.html#a18fbc979a721da043a39f6f6c1e7c4d8"> 154</a></span><a class="code hl_function" href="namespaceripple.html#aea954383230f579cb080646b898088a5">withinRelativeDistance</a>(Amt <span class="keyword">const</span>&amp; calc, Amt <span class="keyword">const</span>&amp; req, <a class="code hl_class" href="classripple_1_1Number.html">Number</a> <span class="keyword">const</span>&amp; dist)</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span>{</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> <span class="keywordflow">if</span> (calc == req)</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> <span class="keyword">auto</span> <span class="keyword">const</span> [min, max] = <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/algorithm/minmax.html">std::minmax</a>(calc, req);</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> <span class="keywordflow">return</span> ((max - min) / max) &lt; dist;</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span>}</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span><span class="comment">// clang-format on</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> </div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional&lt;Number&gt;</a></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span><a class="code hl_function" href="namespaceripple.html#a253fae38afa138d393a173425288eead">solveQuadraticEqSmallest</a>(Number <span class="keyword">const</span>&amp; a, Number <span class="keyword">const</span>&amp; b, Number <span class="keyword">const</span>&amp; c);</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> </div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> TIn, <span class="keyword">typename</span> TOut&gt;</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional&lt;TAmounts&lt;TIn, TOut&gt;</a>&gt;</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"><a class="line" href="namespaceripple.html#a6528bd67e51ead95b0354c151cbd3b4c"> 194</a></span><a class="code hl_function" href="namespaceripple.html#a6528bd67e51ead95b0354c151cbd3b4c">getAMMOfferStartWithTakerGets</a>(</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> TAmounts&lt;TIn, TOut&gt; <span class="keyword">const</span>&amp; pool,</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> Quality <span class="keyword">const</span>&amp; targetQuality,</div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a> <span class="keyword">const</span>&amp; tfee)</div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span>{</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span> <span class="keywordflow">if</span> (targetQuality.rate() == beast::zero)</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span> <span class="keywordflow">return</span> std::nullopt;</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span> </div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span> <a class="code hl_class" href="classripple_1_1NumberRoundModeGuard.html">NumberRoundModeGuard</a> mg(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534afb083653be2726415a0832efd2d66e95">Number::to_nearest</a>);</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span> <span class="keyword">auto</span> <span class="keyword">const</span> f = <a class="code hl_function" href="namespaceripple.html#a7894756905fee556c1541cd1de1f697a">feeMult</a>(tfee);</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> <span class="keyword">auto</span> <span class="keyword">const</span> a = 1;</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> <span class="keyword">auto</span> <span class="keyword">const</span> b = pool.in * (1 - 1 / f) / targetQuality.rate() - 2 * pool.out;</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span> <span class="keyword">auto</span> <span class="keyword">const</span> c =</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> pool.out * pool.out - (pool.in * pool.out) / targetQuality.rate();</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span> </div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span> <span class="keyword">auto</span> nTakerGets = <a class="code hl_function" href="namespaceripple.html#a253fae38afa138d393a173425288eead">solveQuadraticEqSmallest</a>(a, b, c);</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span> <span class="keywordflow">if</span> (!nTakerGets || *nTakerGets &lt;= 0)</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span> <span class="keywordflow">return</span> std::nullopt; <span class="comment">// LCOV_EXCL_LINE</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span> </div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span> <span class="keyword">auto</span> <span class="keyword">const</span> nTakerGetsConstraint =</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span> pool.out - pool.in / (targetQuality.rate() * f);</div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span> <span class="keywordflow">if</span> (nTakerGetsConstraint &lt;= 0)</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span> <span class="keywordflow">return</span> std::nullopt;</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span> </div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span> <span class="comment">// Select the smallest to maximize the quality</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span> <span class="keywordflow">if</span> (nTakerGetsConstraint &lt; *nTakerGets)</div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span> nTakerGets = nTakerGetsConstraint;</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span> </div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno"> 222</span> <span class="keyword">auto</span> getAmounts = [&amp;pool, &amp;tfee](<a class="code hl_class" href="classripple_1_1Number.html">Number</a> <span class="keyword">const</span>&amp; nTakerGetsProposed) {</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"> 223</span> <span class="comment">// Round downward to minimize the offer and to maximize the quality.</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span> <span class="comment">// This has the most impact when takerGets is XRP.</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span> <span class="keyword">auto</span> <span class="keyword">const</span> takerGets = toAmount&lt;TOut&gt;(</div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span> <a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.out), nTakerGetsProposed, <a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">Number::downward</a>);</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span> <span class="keywordflow">return</span> TAmounts&lt;TIn, TOut&gt;{</div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span> <a class="code hl_function" href="namespaceripple.html#affb9400cd4cf6d952445bf00803cc92f">swapAssetOut</a>(pool, takerGets, tfee), takerGets};</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span> };</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span> </div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span> <span class="comment">// Try to reduce the offer size to improve the quality.</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno"> 232</span> <span class="comment">// The quality might still not match the targetQuality for a tiny offer.</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno"> 233</span> <span class="keywordflow">if</span> (<span class="keyword">auto</span> <span class="keyword">const</span> amounts = getAmounts(*nTakerGets);</div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno"> 234</span> Quality{amounts} &lt; targetQuality)</div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"> 235</span> <span class="keywordflow">return</span> getAmounts(<a class="code hl_function" href="namespaceripple_1_1detail.html#ad2407266f6fb0fccc12032875b2cbb01">detail::reduceOffer</a>(amounts.out));</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span> <span class="keywordflow">return</span> amounts;</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</span>}</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno"> 239</span> </div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"> 263</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> TIn, <span class="keyword">typename</span> TOut&gt;</div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno"> 264</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional&lt;TAmounts&lt;TIn, TOut&gt;</a>&gt;</div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno"><a class="line" href="namespaceripple.html#ae93fdcb47fcb2819770cde741b278677"> 265</a></span><a class="code hl_function" href="namespaceripple.html#ae93fdcb47fcb2819770cde741b278677">getAMMOfferStartWithTakerPays</a>(</div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno"> 266</span> TAmounts&lt;TIn, TOut&gt; <span class="keyword">const</span>&amp; pool,</div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"> 267</span> Quality <span class="keyword">const</span>&amp; targetQuality,</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno"> 268</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a> tfee)</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"> 269</span>{</div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"> 270</span> <span class="keywordflow">if</span> (targetQuality.rate() == beast::zero)</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"> 271</span> <span class="keywordflow">return</span> std::nullopt;</div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno"> 272</span> </div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno"> 273</span> <a class="code hl_class" href="classripple_1_1NumberRoundModeGuard.html">NumberRoundModeGuard</a> mg(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534afb083653be2726415a0832efd2d66e95">Number::to_nearest</a>);</div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno"> 274</span> <span class="keyword">auto</span> <span class="keyword">const</span> f = <a class="code hl_function" href="namespaceripple.html#a7894756905fee556c1541cd1de1f697a">feeMult</a>(tfee);</div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno"> 275</span> <span class="keyword">auto</span> <span class="keyword">const</span>&amp; a = f;</div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno"> 276</span> <span class="keyword">auto</span> <span class="keyword">const</span> b = pool.in * (1 + f);</div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno"> 277</span> <span class="keyword">auto</span> <span class="keyword">const</span> c =</div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno"> 278</span> pool.in * pool.in - pool.in * pool.out * targetQuality.rate();</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"> 279</span> </div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno"> 280</span> <span class="keyword">auto</span> nTakerPays = <a class="code hl_function" href="namespaceripple.html#a253fae38afa138d393a173425288eead">solveQuadraticEqSmallest</a>(a, b, c);</div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno"> 281</span> <span class="keywordflow">if</span> (!nTakerPays || nTakerPays &lt;= 0)</div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"> 282</span> <span class="keywordflow">return</span> std::nullopt; <span class="comment">// LCOV_EXCL_LINE</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"> 283</span> </div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno"> 284</span> <span class="keyword">auto</span> <span class="keyword">const</span> nTakerPaysConstraint =</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno"> 285</span> pool.out * targetQuality.rate() - pool.in / f;</div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno"> 286</span> <span class="keywordflow">if</span> (nTakerPaysConstraint &lt;= 0)</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"> 287</span> <span class="keywordflow">return</span> std::nullopt;</div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno"> 288</span> </div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno"> 289</span> <span class="comment">// Select the smallest to maximize the quality</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno"> 290</span> <span class="keywordflow">if</span> (nTakerPaysConstraint &lt; *nTakerPays)</div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno"> 291</span> nTakerPays = nTakerPaysConstraint;</div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno"> 292</span> </div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno"> 293</span> <span class="keyword">auto</span> getAmounts = [&amp;pool, &amp;tfee](<a class="code hl_class" href="classripple_1_1Number.html">Number</a> <span class="keyword">const</span>&amp; nTakerPaysProposed) {</div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno"> 294</span> <span class="comment">// Round downward to minimize the offer and to maximize the quality.</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"> 295</span> <span class="comment">// This has the most impact when takerPays is XRP.</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno"> 296</span> <span class="keyword">auto</span> <span class="keyword">const</span> takerPays = toAmount&lt;TIn&gt;(</div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno"> 297</span> <a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.in), nTakerPaysProposed, <a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">Number::downward</a>);</div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno"> 298</span> <span class="keywordflow">return</span> TAmounts&lt;TIn, TOut&gt;{</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"> 299</span> takerPays, <a class="code hl_function" href="namespaceripple.html#a46ef81e270b726cb937bec7c0e0c8115">swapAssetIn</a>(pool, takerPays, tfee)};</div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno"> 300</span> };</div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno"> 301</span> </div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno"> 302</span> <span class="comment">// Try to reduce the offer size to improve the quality.</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno"> 303</span> <span class="comment">// The quality might still not match the targetQuality for a tiny offer.</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno"> 304</span> <span class="keywordflow">if</span> (<span class="keyword">auto</span> <span class="keyword">const</span> amounts = getAmounts(*nTakerPays);</div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno"> 305</span> Quality{amounts} &lt; targetQuality)</div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno"> 306</span> <span class="keywordflow">return</span> getAmounts(<a class="code hl_function" href="namespaceripple_1_1detail.html#ad2407266f6fb0fccc12032875b2cbb01">detail::reduceOffer</a>(amounts.in));</div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno"> 307</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno"> 308</span> <span class="keywordflow">return</span> amounts;</div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno"> 309</span>}</div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno"> 310</span> </div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno"> 327</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> TIn, <span class="keyword">typename</span> TOut&gt;</div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno"> 328</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional&lt;TAmounts&lt;TIn, TOut&gt;</a>&gt;</div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno"><a class="line" href="namespaceripple.html#a90756d1bf92c06c33bd890299a680166"> 329</a></span><a class="code hl_function" href="namespaceripple.html#a90756d1bf92c06c33bd890299a680166">changeSpotPriceQuality</a>(</div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno"> 330</span> TAmounts&lt;TIn, TOut&gt; <span class="keyword">const</span>&amp; pool,</div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno"> 331</span> Quality <span class="keyword">const</span>&amp; quality,</div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno"> 332</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a> tfee,</div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno"> 333</span> <a class="code hl_class" href="classripple_1_1Rules.html">Rules</a> <span class="keyword">const</span>&amp; rules,</div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno"> 334</span> <a class="code hl_class" href="classbeast_1_1Journal.html">beast::Journal</a> j)</div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno"> 335</span>{</div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno"> 336</span> <span class="keywordflow">if</span> (!rules.<a class="code hl_function" href="classripple_1_1Rules.html#a1a8388a2b9588aa9446ece92a88e0dd2">enabled</a>(fixAMMv1_1))</div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno"> 337</span> {</div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno"> 338</span> <span class="comment">// Finds takerPays (i) and takerGets (o) such that given pool</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno"> 339</span> <span class="comment">// composition poolGets(I) and poolPays(O): (O - o) / (I + i) = quality.</span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno"> 340</span> <span class="comment">// Where takerGets is calculated as the swapAssetIn (see below).</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno"> 341</span> <span class="comment">// The above equation produces the quadratic equation:</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno"> 342</span> <span class="comment">// i^2*(1-fee) + i*I*(2-fee) + I^2 - I*O/quality,</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno"> 343</span> <span class="comment">// which is solved for i, and o is found with swapAssetIn().</span></div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno"> 344</span> <span class="keyword">auto</span> <span class="keyword">const</span> f = <a class="code hl_function" href="namespaceripple.html#a7894756905fee556c1541cd1de1f697a">feeMult</a>(tfee); <span class="comment">// 1 - fee</span></div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno"> 345</span> <span class="keyword">auto</span> <span class="keyword">const</span>&amp; a = f;</div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno"> 346</span> <span class="keyword">auto</span> <span class="keyword">const</span> b = pool.in * (1 + f);</div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno"> 347</span> <a class="code hl_class" href="classripple_1_1Number.html">Number</a> <span class="keyword">const</span> c =</div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno"> 348</span> pool.in * pool.in - pool.in * pool.out * quality.rate();</div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno"> 349</span> <span class="keywordflow">if</span> (<span class="keyword">auto</span> <span class="keyword">const</span> res = b * b - 4 * a * c; res &lt; 0)</div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno"> 350</span> <span class="keywordflow">return</span> std::nullopt; <span class="comment">// LCOV_EXCL_LINE</span></div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno"> 351</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<span class="keyword">auto</span> <span class="keyword">const</span> nTakerPaysPropose = (-b + <a class="code hl_function" href="namespaceripple.html#aecb9ae1add070266b1be59ff570ec713">root2</a>(res)) / (2 * a);</div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno"> 352</span> nTakerPaysPropose &gt; 0)</div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno"> 353</span> {</div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno"> 354</span> <span class="keyword">auto</span> <span class="keyword">const</span> nTakerPays = [&amp;]() {</div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno"> 355</span> <span class="comment">// The fee might make the AMM offer quality less than CLOB</span></div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno"> 356</span> <span class="comment">// quality. Therefore, AMM offer has to satisfy this constraint:</span></div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno"> 357</span> <span class="comment">// o / i &gt;= q. Substituting o with swapAssetIn() gives: i &lt;= O /</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno"> 358</span> <span class="comment">// q - I / (1 - fee).</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno"> 359</span> <span class="keyword">auto</span> <span class="keyword">const</span> nTakerPaysConstraint =</div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno"> 360</span> pool.out * quality.rate() - pool.in / f;</div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno"> 361</span> <span class="keywordflow">if</span> (nTakerPaysPropose &gt; nTakerPaysConstraint)</div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno"> 362</span> <span class="keywordflow">return</span> nTakerPaysConstraint;</div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno"> 363</span> <span class="keywordflow">return</span> nTakerPaysPropose;</div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno"> 364</span> }();</div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno"> 365</span> <span class="keywordflow">if</span> (nTakerPays &lt;= 0)</div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno"> 366</span> {</div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno"> 367</span> JLOG(j.<a class="code hl_function" href="classbeast_1_1Journal.html#abbe082bd27ca0f1d1365af2824e4f85b">trace</a>())</div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno"> 368</span> &lt;&lt; <span class="stringliteral">&quot;changeSpotPriceQuality calc failed: &quot;</span></div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno"> 369</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.out) &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno"> 370</span> &lt;&lt; quality &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; tfee;</div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno"> 371</span> <span class="keywordflow">return</span> std::nullopt;</div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno"> 372</span> }</div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno"> 373</span> <span class="keyword">auto</span> <span class="keyword">const</span> takerPays =</div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno"> 374</span> toAmount&lt;TIn&gt;(<a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.in), nTakerPays, <a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2">Number::upward</a>);</div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno"> 375</span> <span class="comment">// should not fail</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno"> 376</span> <span class="keywordflow">if</span> (<span class="keyword">auto</span> <span class="keyword">const</span> amounts =</div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno"> 377</span> TAmounts&lt;TIn, TOut&gt;{</div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno"> 378</span> takerPays, <a class="code hl_function" href="namespaceripple.html#a46ef81e270b726cb937bec7c0e0c8115">swapAssetIn</a>(pool, takerPays, tfee)};</div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno"> 379</span> Quality{amounts} &lt; quality &amp;&amp;</div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno"> 380</span> !<a class="code hl_function" href="namespaceripple.html#aea954383230f579cb080646b898088a5">withinRelativeDistance</a>(</div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno"> 381</span> Quality{amounts}, quality, <a class="code hl_class" href="classripple_1_1Number.html">Number</a>(1, -7)))</div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno"> 382</span> {</div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno"> 383</span> JLOG(j.<a class="code hl_function" href="classbeast_1_1Journal.html#a49b0713e65bb8e2c51b76fbf16252afe">error</a>())</div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno"> 384</span> &lt;&lt; <span class="stringliteral">&quot;changeSpotPriceQuality failed: &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.in)</div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno"> 385</span> &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.out) &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno"> 386</span> &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; quality &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; tfee &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno"> 387</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(amounts.in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(amounts.out);</div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno"> 388</span> Throw&lt;std::runtime_error&gt;(<span class="stringliteral">&quot;changeSpotPriceQuality failed&quot;</span>);</div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno"> 389</span> }</div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno"> 390</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno"> 391</span> {</div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno"> 392</span> JLOG(j.<a class="code hl_function" href="classbeast_1_1Journal.html#abbe082bd27ca0f1d1365af2824e4f85b">trace</a>())</div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno"> 393</span> &lt;&lt; <span class="stringliteral">&quot;changeSpotPriceQuality succeeded: &quot;</span></div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno"> 394</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.out) &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno"> 395</span> &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; quality &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; tfee &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno"> 396</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(amounts.in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(amounts.out);</div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno"> 397</span> <span class="keywordflow">return</span> amounts;</div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno"> 398</span> }</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno"> 399</span> }</div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno"> 400</span> JLOG(j.<a class="code hl_function" href="classbeast_1_1Journal.html#abbe082bd27ca0f1d1365af2824e4f85b">trace</a>()) &lt;&lt; <span class="stringliteral">&quot;changeSpotPriceQuality calc failed: &quot;</span></div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno"> 401</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.out)</div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno"> 402</span> &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; quality &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; tfee;</div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno"> 403</span> <span class="keywordflow">return</span> std::nullopt;</div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno"> 404</span> }</div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno"> 405</span> </div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno"> 406</span> <span class="comment">// Generate the offer starting with XRP side. Return seated offer amounts</span></div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno"> 407</span> <span class="comment">// if the offer can be generated, otherwise nullopt.</span></div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno"> 408</span> <span class="keyword">auto</span> <span class="keyword">const</span> amounts = [&amp;]() {</div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno"> 409</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="namespaceripple.html#a20d30277b9c78756b3d14493055a307c">isXRP</a>(<a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.out)))</div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno"> 410</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#a6528bd67e51ead95b0354c151cbd3b4c">getAMMOfferStartWithTakerGets</a>(pool, quality, tfee);</div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno"> 411</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceripple.html#ae93fdcb47fcb2819770cde741b278677">getAMMOfferStartWithTakerPays</a>(pool, quality, tfee);</div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno"> 412</span> }();</div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno"> 413</span> <span class="keywordflow">if</span> (!amounts)</div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno"> 414</span> {</div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno"> 415</span> JLOG(j.<a class="code hl_function" href="classbeast_1_1Journal.html#abbe082bd27ca0f1d1365af2824e4f85b">trace</a>()) &lt;&lt; <span class="stringliteral">&quot;changeSpotPrice calc failed: &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.in)</div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno"> 416</span> &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.out) &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; quality &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno"> 417</span> &lt;&lt; tfee &lt;&lt; <a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno"> 418</span> <span class="keywordflow">return</span> std::nullopt;</div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno"> 419</span> }</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno"> 420</span> </div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno"> 421</span> <span class="keywordflow">if</span> (Quality{*amounts} &lt; quality)</div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno"> 422</span> {</div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno"> 423</span> JLOG(j.<a class="code hl_function" href="classbeast_1_1Journal.html#a49b0713e65bb8e2c51b76fbf16252afe">error</a>()) &lt;&lt; <span class="stringliteral">&quot;changeSpotPriceQuality failed: &quot;</span></div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno"> 424</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.out)</div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno"> 425</span> &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; quality &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; tfee &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno"> 426</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(amounts-&gt;in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno"> 427</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(amounts-&gt;out);</div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno"> 428</span> <span class="keywordflow">return</span> std::nullopt;</div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno"> 429</span> }</div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno"> 430</span> </div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno"> 431</span> JLOG(j.<a class="code hl_function" href="classbeast_1_1Journal.html#abbe082bd27ca0f1d1365af2824e4f85b">trace</a>()) &lt;&lt; <span class="stringliteral">&quot;changeSpotPriceQuality succeeded: &quot;</span></div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno"> 432</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(pool.out) &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno"> 433</span> &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; quality &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; tfee &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno"> 434</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(amounts-&gt;in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(amounts-&gt;out);</div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno"> 435</span> </div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno"> 436</span> <span class="keywordflow">return</span> amounts;</div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno"> 437</span>}</div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno"> 438</span> </div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno"> 460</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> TIn, <span class="keyword">typename</span> TOut&gt;</div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno"> 461</span>TOut</div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno"><a class="line" href="namespaceripple.html#a46ef81e270b726cb937bec7c0e0c8115"> 462</a></span><a class="code hl_function" href="namespaceripple.html#a46ef81e270b726cb937bec7c0e0c8115">swapAssetIn</a>(</div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno"> 463</span> TAmounts&lt;TIn, TOut&gt; <span class="keyword">const</span>&amp; pool,</div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno"> 464</span> TIn <span class="keyword">const</span>&amp; assetIn,</div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno"> 465</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a> tfee)</div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno"> 466</span>{</div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno"> 467</span> <span class="keywordflow">if</span> (<span class="keyword">auto</span> <span class="keyword">const</span>&amp; rules = <a class="code hl_function" href="namespaceripple.html#ac46ee7ce49b6deed89f70a94924c416f">getCurrentTransactionRules</a>();</div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno"> 468</span> rules &amp;&amp; rules-&gt;enabled(fixAMMv1_1))</div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno"> 469</span> {</div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno"> 470</span> <span class="comment">// set rounding to always favor the amm. Clip to zero.</span></div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno"> 471</span> <span class="comment">// calculate:</span></div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno"> 472</span> <span class="comment">// pool.out -</span></div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno"> 473</span> <span class="comment">// (pool.in * pool.out) / (pool.in + assetIn * feeMult(tfee)),</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno"> 474</span> <span class="comment">// and explicitly set the rounding modes</span></div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno"> 475</span> <span class="comment">// Favoring the amm means we should:</span></div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno"> 476</span> <span class="comment">// minimize:</span></div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno"> 477</span> <span class="comment">// pool.out -</span></div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno"> 478</span> <span class="comment">// (pool.in * pool.out) / (pool.in + assetIn * feeMult(tfee)),</span></div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno"> 479</span> <span class="comment">// maximize:</span></div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno"> 480</span> <span class="comment">// (pool.in * pool.out) / (pool.in + assetIn * feeMult(tfee)),</span></div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno"> 481</span> <span class="comment">// (pool.in * pool.out)</span></div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno"> 482</span> <span class="comment">// minimize:</span></div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno"> 483</span> <span class="comment">// (pool.in + assetIn * feeMult(tfee)),</span></div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno"> 484</span> <span class="comment">// minimize:</span></div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno"> 485</span> <span class="comment">// assetIn * feeMult(tfee)</span></div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno"> 486</span> <span class="comment">// feeMult is: (1-fee), fee is tfee/100000</span></div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno"> 487</span> <span class="comment">// minimize:</span></div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno"> 488</span> <span class="comment">// 1-fee</span></div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno"> 489</span> <span class="comment">// maximize:</span></div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno"> 490</span> <span class="comment">// fee</span></div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno"> 491</span> <a class="code hl_class" href="classripple_1_1saveNumberRoundMode.html">saveNumberRoundMode</a> _{<a class="code hl_function" href="classripple_1_1Number.html#a69a91a7aca13639e1705b7fb94ee78d5">Number::getround</a>()};</div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno"> 492</span> </div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno"> 493</span> <a class="code hl_function" href="classripple_1_1Number.html#a9f2a0df7ad0f278908643927a19592f2">Number::setround</a>(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2">Number::upward</a>);</div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno"> 494</span> <span class="keyword">auto</span> <span class="keyword">const</span> numerator = pool.in * pool.out;</div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno"> 495</span> <span class="keyword">auto</span> <span class="keyword">const</span> <a class="code hl_class" href="classripple_1_1test_1_1jtx_1_1fee.html">fee</a> = <a class="code hl_function" href="namespaceripple.html#aa8871e2f35cee24497183274c0bab5fd">getFee</a>(tfee);</div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno"> 496</span> </div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno"> 497</span> <a class="code hl_function" href="classripple_1_1Number.html#a9f2a0df7ad0f278908643927a19592f2">Number::setround</a>(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">Number::downward</a>);</div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno"> 498</span> <span class="keyword">auto</span> <span class="keyword">const</span> denom = pool.in + assetIn * (1 - <a class="code hl_class" href="classripple_1_1test_1_1jtx_1_1fee.html">fee</a>);</div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno"> 499</span> </div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno"> 500</span> <span class="keywordflow">if</span> (denom.signum() &lt;= 0)</div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno"> 501</span> <span class="keywordflow">return</span> toAmount&lt;TOut&gt;(<a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.out), 0);</div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno"> 502</span> </div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno"> 503</span> <a class="code hl_function" href="classripple_1_1Number.html#a9f2a0df7ad0f278908643927a19592f2">Number::setround</a>(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2">Number::upward</a>);</div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno"> 504</span> <span class="keyword">auto</span> <span class="keyword">const</span> ratio = numerator / denom;</div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno"> 505</span> </div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno"> 506</span> <a class="code hl_function" href="classripple_1_1Number.html#a9f2a0df7ad0f278908643927a19592f2">Number::setround</a>(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">Number::downward</a>);</div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno"> 507</span> <span class="keyword">auto</span> <span class="keyword">const</span> swapOut = pool.out - ratio;</div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno"> 508</span> </div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno"> 509</span> <span class="keywordflow">if</span> (swapOut.signum() &lt; 0)</div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno"> 510</span> <span class="keywordflow">return</span> toAmount&lt;TOut&gt;(<a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.out), 0);</div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno"> 511</span> </div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno"> 512</span> <span class="keywordflow">return</span> toAmount&lt;TOut&gt;(<a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.out), swapOut, <a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">Number::downward</a>);</div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno"> 513</span> }</div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno"> 514</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno"> 515</span> {</div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno"> 516</span> <span class="keywordflow">return</span> toAmount&lt;TOut&gt;(</div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno"> 517</span> <a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.out),</div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno"> 518</span> pool.out -</div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno"> 519</span> (pool.in * pool.out) / (pool.in + assetIn * <a class="code hl_function" href="namespaceripple.html#a7894756905fee556c1541cd1de1f697a">feeMult</a>(tfee)),</div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno"> 520</span> <a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">Number::downward</a>);</div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno"> 521</span> }</div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno"> 522</span>}</div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno"> 523</span> </div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno"> 533</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> TIn, <span class="keyword">typename</span> TOut&gt;</div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno"> 534</span>TIn</div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno"><a class="line" href="namespaceripple.html#affb9400cd4cf6d952445bf00803cc92f"> 535</a></span><a class="code hl_function" href="namespaceripple.html#affb9400cd4cf6d952445bf00803cc92f">swapAssetOut</a>(</div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno"> 536</span> TAmounts&lt;TIn, TOut&gt; <span class="keyword">const</span>&amp; pool,</div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno"> 537</span> TOut <span class="keyword">const</span>&amp; assetOut,</div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno"> 538</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a> tfee)</div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno"> 539</span>{</div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno"> 540</span> <span class="keywordflow">if</span> (<span class="keyword">auto</span> <span class="keyword">const</span>&amp; rules = <a class="code hl_function" href="namespaceripple.html#ac46ee7ce49b6deed89f70a94924c416f">getCurrentTransactionRules</a>();</div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno"> 541</span> rules &amp;&amp; rules-&gt;enabled(fixAMMv1_1))</div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno"> 542</span> {</div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno"> 543</span> <span class="comment">// set rounding to always favor the amm. Clip to zero.</span></div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno"> 544</span> <span class="comment">// calculate:</span></div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno"> 545</span> <span class="comment">// ((pool.in * pool.out) / (pool.out - assetOut) - pool.in) /</span></div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno"> 546</span> <span class="comment">// (1-tfee/100000)</span></div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno"> 547</span> <span class="comment">// maximize:</span></div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno"> 548</span> <span class="comment">// ((pool.in * pool.out) / (pool.out - assetOut) - pool.in)</span></div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno"> 549</span> <span class="comment">// maximize:</span></div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno"> 550</span> <span class="comment">// (pool.in * pool.out) / (pool.out - assetOut)</span></div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno"> 551</span> <span class="comment">// maximize:</span></div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno"> 552</span> <span class="comment">// (pool.in * pool.out)</span></div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno"> 553</span> <span class="comment">// minimize</span></div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno"> 554</span> <span class="comment">// (pool.out - assetOut)</span></div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno"> 555</span> <span class="comment">// minimize:</span></div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno"> 556</span> <span class="comment">// (1-tfee/100000)</span></div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno"> 557</span> <span class="comment">// maximize:</span></div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno"> 558</span> <span class="comment">// tfee/100000</span></div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno"> 559</span> </div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno"> 560</span> <a class="code hl_class" href="classripple_1_1saveNumberRoundMode.html">saveNumberRoundMode</a> _{<a class="code hl_function" href="classripple_1_1Number.html#a69a91a7aca13639e1705b7fb94ee78d5">Number::getround</a>()};</div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno"> 561</span> </div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno"> 562</span> <a class="code hl_function" href="classripple_1_1Number.html#a9f2a0df7ad0f278908643927a19592f2">Number::setround</a>(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2">Number::upward</a>);</div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno"> 563</span> <span class="keyword">auto</span> <span class="keyword">const</span> numerator = pool.in * pool.out;</div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno"> 564</span> </div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno"> 565</span> <a class="code hl_function" href="classripple_1_1Number.html#a9f2a0df7ad0f278908643927a19592f2">Number::setround</a>(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">Number::downward</a>);</div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno"> 566</span> <span class="keyword">auto</span> <span class="keyword">const</span> denom = pool.out - assetOut;</div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno"> 567</span> <span class="keywordflow">if</span> (denom.signum() &lt;= 0)</div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno"> 568</span> {</div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno"> 569</span> <span class="keywordflow">return</span> toMaxAmount&lt;TIn&gt;(<a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.in));</div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno"> 570</span> }</div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno"> 571</span> </div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno"> 572</span> <a class="code hl_function" href="classripple_1_1Number.html#a9f2a0df7ad0f278908643927a19592f2">Number::setround</a>(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2">Number::upward</a>);</div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno"> 573</span> <span class="keyword">auto</span> <span class="keyword">const</span> ratio = numerator / denom;</div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno"> 574</span> <span class="keyword">auto</span> <span class="keyword">const</span> numerator2 = ratio - pool.in;</div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno"> 575</span> <span class="keyword">auto</span> <span class="keyword">const</span> <a class="code hl_class" href="classripple_1_1test_1_1jtx_1_1fee.html">fee</a> = <a class="code hl_function" href="namespaceripple.html#aa8871e2f35cee24497183274c0bab5fd">getFee</a>(tfee);</div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno"> 576</span> </div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno"> 577</span> <a class="code hl_function" href="classripple_1_1Number.html#a9f2a0df7ad0f278908643927a19592f2">Number::setround</a>(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">Number::downward</a>);</div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno"> 578</span> <span class="keyword">auto</span> <span class="keyword">const</span> <a class="code hl_function" href="namespaceripple.html#a7894756905fee556c1541cd1de1f697a">feeMult</a> = 1 - <a class="code hl_class" href="classripple_1_1test_1_1jtx_1_1fee.html">fee</a>;</div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno"> 579</span> </div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno"> 580</span> <a class="code hl_function" href="classripple_1_1Number.html#a9f2a0df7ad0f278908643927a19592f2">Number::setround</a>(<a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2">Number::upward</a>);</div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno"> 581</span> <span class="keyword">auto</span> <span class="keyword">const</span> swapIn = numerator2 / <a class="code hl_function" href="namespaceripple.html#a7894756905fee556c1541cd1de1f697a">feeMult</a>;</div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno"> 582</span> <span class="keywordflow">if</span> (swapIn.signum() &lt; 0)</div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno"> 583</span> <span class="keywordflow">return</span> toAmount&lt;TIn&gt;(<a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.in), 0);</div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno"> 584</span> </div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno"> 585</span> <span class="keywordflow">return</span> toAmount&lt;TIn&gt;(<a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.in), swapIn, <a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2">Number::upward</a>);</div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno"> 586</span> }</div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno"> 587</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno"> 588</span> {</div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno"> 589</span> <span class="keywordflow">return</span> toAmount&lt;TIn&gt;(</div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno"> 590</span> <a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(pool.in),</div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno"> 591</span> ((pool.in * pool.out) / (pool.out - assetOut) - pool.in) /</div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno"> 592</span> <a class="code hl_function" href="namespaceripple.html#a7894756905fee556c1541cd1de1f697a">feeMult</a>(tfee),</div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno"> 593</span> <a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2">Number::upward</a>);</div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno"> 594</span> }</div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno"> 595</span>}</div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno"> 596</span> </div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno"> 599</span>Number</div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno"> 600</span><a class="code hl_function" href="namespaceripple.html#a58b7851104129e42da9c5260ba6f00d6">square</a>(Number <span class="keyword">const</span>&amp; n);</div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno"> 601</span> </div>
<div class="line"><a id="l00613" name="l00613"></a><span class="lineno"> 613</span>STAmount</div>
<div class="line"><a id="l00614" name="l00614"></a><span class="lineno"> 614</span><a class="code hl_function" href="namespaceripple.html#a0e17cbd5597a6159dfa1045e6b2e951e">adjustLPTokens</a>(</div>
<div class="line"><a id="l00615" name="l00615"></a><span class="lineno"> 615</span> STAmount <span class="keyword">const</span>&amp; lptAMMBalance,</div>
<div class="line"><a id="l00616" name="l00616"></a><span class="lineno"> 616</span> STAmount <span class="keyword">const</span>&amp; lpTokens,</div>
<div class="line"><a id="l00617" name="l00617"></a><span class="lineno"> 617</span> <span class="keywordtype">bool</span> isDeposit);</div>
<div class="line"><a id="l00618" name="l00618"></a><span class="lineno"> 618</span> </div>
<div class="line"><a id="l00630" name="l00630"></a><span class="lineno"> 630</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/tuple.html">std::tuple&lt;STAmount, std::optional&lt;STAmount&gt;</a>, STAmount&gt;</div>
<div class="line"><a id="l00631" name="l00631"></a><span class="lineno"> 631</span><a class="code hl_function" href="namespaceripple.html#a5f936a9395ee6781feff5c6a13adacf1">adjustAmountsByLPTokens</a>(</div>
<div class="line"><a id="l00632" name="l00632"></a><span class="lineno"> 632</span> STAmount <span class="keyword">const</span>&amp; amountBalance,</div>
<div class="line"><a id="l00633" name="l00633"></a><span class="lineno"> 633</span> STAmount <span class="keyword">const</span>&amp; amount,</div>
<div class="line"><a id="l00634" name="l00634"></a><span class="lineno"> 634</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional&lt;STAmount&gt;</a> <span class="keyword">const</span>&amp; amount2,</div>
<div class="line"><a id="l00635" name="l00635"></a><span class="lineno"> 635</span> STAmount <span class="keyword">const</span>&amp; lptAMMBalance,</div>
<div class="line"><a id="l00636" name="l00636"></a><span class="lineno"> 636</span> STAmount <span class="keyword">const</span>&amp; lpTokens,</div>
<div class="line"><a id="l00637" name="l00637"></a><span class="lineno"> 637</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a> tfee,</div>
<div class="line"><a id="l00638" name="l00638"></a><span class="lineno"> 638</span> <span class="keywordtype">bool</span> isDeposit);</div>
<div class="line"><a id="l00639" name="l00639"></a><span class="lineno"> 639</span> </div>
<div class="line"><a id="l00643" name="l00643"></a><span class="lineno"> 643</span>Number</div>
<div class="line"><a id="l00644" name="l00644"></a><span class="lineno"> 644</span><a class="code hl_function" href="namespaceripple.html#a3d22714f28b806ea5c702eba2db5fbc2">solveQuadraticEq</a>(Number <span class="keyword">const</span>&amp; a, Number <span class="keyword">const</span>&amp; b, Number <span class="keyword">const</span>&amp; c);</div>
<div class="line"><a id="l00645" name="l00645"></a><span class="lineno"> 645</span> </div>
<div class="line"><a id="l00646" name="l00646"></a><span class="lineno"> 646</span>} <span class="comment">// namespace ripple</span></div>
<div class="line"><a id="l00647" name="l00647"></a><span class="lineno"> 647</span> </div>
<div class="line"><a id="l00648" name="l00648"></a><span class="lineno"> 648</span><span class="preprocessor">#endif </span><span class="comment">// RIPPLE_APP_MISC_AMMHELPERS_H_INCLUDED</span></div>
<div class="ttc" id="aclassbeast_1_1Journal_html"><div class="ttname"><a href="classbeast_1_1Journal.html">beast::Journal</a></div><div class="ttdoc">A generic endpoint for log messages.</div><div class="ttdef"><b>Definition:</b> <a href="Journal_8h_source.html#l00059">Journal.h:60</a></div></div>
<div class="ttc" id="aclassbeast_1_1Journal_html_a49b0713e65bb8e2c51b76fbf16252afe"><div class="ttname"><a href="classbeast_1_1Journal.html#a49b0713e65bb8e2c51b76fbf16252afe">beast::Journal::error</a></div><div class="ttdeci">Stream error() const</div><div class="ttdef"><b>Definition:</b> <a href="Journal_8h_source.html#l00346">Journal.h:346</a></div></div>
<div class="ttc" id="aclassbeast_1_1Journal_html_abbe082bd27ca0f1d1365af2824e4f85b"><div class="ttname"><a href="classbeast_1_1Journal.html#abbe082bd27ca0f1d1365af2824e4f85b">beast::Journal::trace</a></div><div class="ttdeci">Stream trace() const</div><div class="ttdoc">Severity stream access functions.</div><div class="ttdef"><b>Definition:</b> <a href="Journal_8h_source.html#l00322">Journal.h:322</a></div></div>
<div class="ttc" id="aclassripple_1_1NumberRoundModeGuard_html"><div class="ttname"><a href="classripple_1_1NumberRoundModeGuard.html">ripple::NumberRoundModeGuard</a></div><div class="ttdef"><b>Definition:</b> <a href="Number_8h_source.html#l00392">Number.h:393</a></div></div>
<div class="ttc" id="aclassripple_1_1Number_html"><div class="ttname"><a href="classripple_1_1Number.html">ripple::Number</a></div><div class="ttdef"><b>Definition:</b> <a href="Number_8h_source.html#l00035">Number.h:36</a></div></div>
<div class="ttc" id="aclassripple_1_1Number_html_a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324"><div class="ttname"><a href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">ripple::Number::downward</a></div><div class="ttdeci">@ downward</div><div class="ttdef"><b>Definition:</b> <a href="Number_8h_source.html#l00178">Number.h:178</a></div></div>
<div class="ttc" id="aclassripple_1_1Number_html_a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2"><div class="ttname"><a href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2">ripple::Number::upward</a></div><div class="ttdeci">@ upward</div><div class="ttdef"><b>Definition:</b> <a href="Number_8h_source.html#l00178">Number.h:178</a></div></div>
<div class="ttc" id="aclassripple_1_1Number_html_a33e3d8e7a95979bd1eb22c59703c8534afb083653be2726415a0832efd2d66e95"><div class="ttname"><a href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534afb083653be2726415a0832efd2d66e95">ripple::Number::to_nearest</a></div><div class="ttdeci">@ to_nearest</div><div class="ttdef"><b>Definition:</b> <a href="Number_8h_source.html#l00178">Number.h:178</a></div></div>
<div class="ttc" id="aclassripple_1_1Number_html_a33e3d8e7a95979bd1eb22c59703c8534afed3119e1980867324d399f42cbf548d"><div class="ttname"><a href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534afed3119e1980867324d399f42cbf548d">ripple::Number::towards_zero</a></div><div class="ttdeci">@ towards_zero</div><div class="ttdef"><b>Definition:</b> <a href="Number_8h_source.html#l00178">Number.h:178</a></div></div>
<div class="ttc" id="aclassripple_1_1Number_html_a69a91a7aca13639e1705b7fb94ee78d5"><div class="ttname"><a href="classripple_1_1Number.html#a69a91a7aca13639e1705b7fb94ee78d5">ripple::Number::getround</a></div><div class="ttdeci">static rounding_mode getround()</div><div class="ttdef"><b>Definition:</b> <a href="Number_8cpp_source.html#l00047">Number.cpp:47</a></div></div>
<div class="ttc" id="aclassripple_1_1Number_html_a9f2a0df7ad0f278908643927a19592f2"><div class="ttname"><a href="classripple_1_1Number.html#a9f2a0df7ad0f278908643927a19592f2">ripple::Number::setround</a></div><div class="ttdeci">static rounding_mode setround(rounding_mode mode)</div><div class="ttdef"><b>Definition:</b> <a href="Number_8cpp_source.html#l00053">Number.cpp:53</a></div></div>
<div class="ttc" id="aclassripple_1_1Rules_html"><div class="ttname"><a href="classripple_1_1Rules.html">ripple::Rules</a></div><div class="ttdoc">Rules controlling protocol behavior.</div><div class="ttdef"><b>Definition:</b> <a href="Rules_8h_source.html#l00034">Rules.h:35</a></div></div>
<div class="ttc" id="aclassripple_1_1Rules_html_a1a8388a2b9588aa9446ece92a88e0dd2"><div class="ttname"><a href="classripple_1_1Rules.html#a1a8388a2b9588aa9446ece92a88e0dd2">ripple::Rules::enabled</a></div><div class="ttdeci">bool enabled(uint256 const &amp;feature) const</div><div class="ttdoc">Returns true if a feature is enabled.</div><div class="ttdef"><b>Definition:</b> <a href="Rules_8cpp_source.html#l00130">Rules.cpp:130</a></div></div>
<div class="ttc" id="aclassripple_1_1saveNumberRoundMode_html"><div class="ttname"><a href="classripple_1_1saveNumberRoundMode.html">ripple::saveNumberRoundMode</a></div><div class="ttdef"><b>Definition:</b> <a href="Number_8h_source.html#l00370">Number.h:371</a></div></div>
<div class="ttc" id="aclassripple_1_1test_1_1jtx_1_1fee_html"><div class="ttname"><a href="classripple_1_1test_1_1jtx_1_1fee.html">ripple::test::jtx::fee</a></div><div class="ttdoc">Set the fee on a JTx.</div><div class="ttdef"><b>Definition:</b> <a href="fee_8h_source.html#l00036">fee.h:37</a></div></div>
<div class="ttc" id="aendl_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a></div><div class="ttdeci">T endl(T... args)</div></div>
<div class="ttc" id="ainteger_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint16_t</a></div></div>
<div class="ttc" id="aminmax_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/algorithm/minmax.html">std::minmax</a></div><div class="ttdeci">T minmax(T... args)</div></div>
<div class="ttc" id="anamespaceripple_1_1detail_html_ad2407266f6fb0fccc12032875b2cbb01"><div class="ttname"><a href="namespaceripple_1_1detail.html#ad2407266f6fb0fccc12032875b2cbb01">ripple::detail::reduceOffer</a></div><div class="ttdeci">Number reduceOffer(auto const &amp;amount)</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8h_source.html#l00040">AMMHelpers.h:40</a></div></div>
<div class="ttc" id="anamespaceripple_html"><div class="ttname"><a href="namespaceripple.html">ripple</a></div><div class="ttdoc">Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.</div><div class="ttdef"><b>Definition:</b> <a href="algorithm_8h_source.html#l00026">algorithm.h:26</a></div></div>
<div class="ttc" id="anamespaceripple_html_a0b2344222057d8b5b9923b2911962879"><div class="ttname"><a href="namespaceripple.html#a0b2344222057d8b5b9923b2911962879">ripple::lpTokensIn</a></div><div class="ttdeci">STAmount lpTokensIn(STAmount const &amp;asset1Balance, STAmount const &amp;asset1Deposit, STAmount const &amp;lptAMMBalance, std::uint16_t tfee)</div><div class="ttdoc">Calculate LP Tokens given asset's deposit amount.</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8cpp_source.html#l00041">AMMHelpers.cpp:41</a></div></div>
<div class="ttc" id="anamespaceripple_html_a0e17cbd5597a6159dfa1045e6b2e951e"><div class="ttname"><a href="namespaceripple.html#a0e17cbd5597a6159dfa1045e6b2e951e">ripple::adjustLPTokens</a></div><div class="ttdeci">STAmount adjustLPTokens(STAmount const &amp;lptAMMBalance, STAmount const &amp;lpTokens, bool isDeposit)</div><div class="ttdoc">Adjust LP tokens to deposit/withdraw.</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8cpp_source.html#l00133">AMMHelpers.cpp:133</a></div></div>
<div class="ttc" id="anamespaceripple_html_a20d30277b9c78756b3d14493055a307c"><div class="ttname"><a href="namespaceripple.html#a20d30277b9c78756b3d14493055a307c">ripple::isXRP</a></div><div class="ttdeci">bool isXRP(AccountID const &amp;c)</div><div class="ttdef"><b>Definition:</b> <a href="AccountID_8h_source.html#l00091">AccountID.h:91</a></div></div>
<div class="ttc" id="anamespaceripple_html_a253fae38afa138d393a173425288eead"><div class="ttname"><a href="namespaceripple.html#a253fae38afa138d393a173425288eead">ripple::solveQuadraticEqSmallest</a></div><div class="ttdeci">std::optional&lt; Number &gt; solveQuadraticEqSmallest(Number const &amp;a, Number const &amp;b, Number const &amp;c)</div><div class="ttdoc">Solve quadratic equation to find takerGets or takerPays.</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8cpp_source.html#l00227">AMMHelpers.cpp:227</a></div></div>
<div class="ttc" id="anamespaceripple_html_a35d75f3e8c1d99beb8c834d767070d8c"><div class="ttname"><a href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">ripple::getIssue</a></div><div class="ttdeci">Issue getIssue(T const &amp;amt)</div><div class="ttdef"><b>Definition:</b> <a href="AmountConversions_8h_source.html#l00186">AmountConversions.h:186</a></div></div>
<div class="ttc" id="anamespaceripple_html_a3d22714f28b806ea5c702eba2db5fbc2"><div class="ttname"><a href="namespaceripple.html#a3d22714f28b806ea5c702eba2db5fbc2">ripple::solveQuadraticEq</a></div><div class="ttdeci">Number solveQuadraticEq(Number const &amp;a, Number const &amp;b, Number const &amp;c)</div><div class="ttdoc">Positive solution for quadratic equation: x = (-b + sqrt(b**2 + 4*a*c))/(2*a)</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8cpp_source.html#l00220">AMMHelpers.cpp:220</a></div></div>
<div class="ttc" id="anamespaceripple_html_a46ef81e270b726cb937bec7c0e0c8115"><div class="ttname"><a href="namespaceripple.html#a46ef81e270b726cb937bec7c0e0c8115">ripple::swapAssetIn</a></div><div class="ttdeci">TOut swapAssetIn(TAmounts&lt; TIn, TOut &gt; const &amp;pool, TIn const &amp;assetIn, std::uint16_t tfee)</div><div class="ttdoc">AMM pool invariant - the product (A * B) after swap in/out has to remain at least the same: (A + in) ...</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8h_source.html#l00462">AMMHelpers.h:462</a></div></div>
<div class="ttc" id="anamespaceripple_html_a4c964d1f7629a28f9b916e2d25b39bcd"><div class="ttname"><a href="namespaceripple.html#a4c964d1f7629a28f9b916e2d25b39bcd">ripple::lpTokensOut</a></div><div class="ttdeci">STAmount lpTokensOut(STAmount const &amp;asset1Balance, STAmount const &amp;asset1Withdraw, STAmount const &amp;lptAMMBalance, std::uint16_t tfee)</div><div class="ttdoc">Calculate LP Tokens given asset's withdraw amount.</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8cpp_source.html#l00090">AMMHelpers.cpp:90</a></div></div>
<div class="ttc" id="anamespaceripple_html_a573eb2cecf652856fc74fb1dfbaf8c2a"><div class="ttname"><a href="namespaceripple.html#a573eb2cecf652856fc74fb1dfbaf8c2a">ripple::ammAssetIn</a></div><div class="ttdeci">STAmount ammAssetIn(STAmount const &amp;asset1Balance, STAmount const &amp;lptAMMBalance, STAmount const &amp;lpTokens, std::uint16_t tfee)</div><div class="ttdoc">Calculate asset deposit given LP Tokens.</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8cpp_source.html#l00067">AMMHelpers.cpp:67</a></div></div>
<div class="ttc" id="anamespaceripple_html_a58b7851104129e42da9c5260ba6f00d6"><div class="ttname"><a href="namespaceripple.html#a58b7851104129e42da9c5260ba6f00d6">ripple::square</a></div><div class="ttdeci">Number square(Number const &amp;n)</div><div class="ttdoc">Return square of n.</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8cpp_source.html#l00127">AMMHelpers.cpp:127</a></div></div>
<div class="ttc" id="anamespaceripple_html_a5f936a9395ee6781feff5c6a13adacf1"><div class="ttname"><a href="namespaceripple.html#a5f936a9395ee6781feff5c6a13adacf1">ripple::adjustAmountsByLPTokens</a></div><div class="ttdeci">std::tuple&lt; STAmount, std::optional&lt; STAmount &gt;, STAmount &gt; adjustAmountsByLPTokens(STAmount const &amp;amountBalance, STAmount const &amp;amount, std::optional&lt; STAmount &gt; const &amp;amount2, STAmount const &amp;lptAMMBalance, STAmount const &amp;lpTokens, std::uint16_t tfee, bool isDeposit)</div><div class="ttdoc">Calls adjustLPTokens() and adjusts deposit or withdraw amounts if the adjusted LP tokens are less tha...</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8cpp_source.html#l00147">AMMHelpers.cpp:147</a></div></div>
<div class="ttc" id="anamespaceripple_html_a6528bd67e51ead95b0354c151cbd3b4c"><div class="ttname"><a href="namespaceripple.html#a6528bd67e51ead95b0354c151cbd3b4c">ripple::getAMMOfferStartWithTakerGets</a></div><div class="ttdeci">std::optional&lt; TAmounts&lt; TIn, TOut &gt; &gt; getAMMOfferStartWithTakerGets(TAmounts&lt; TIn, TOut &gt; const &amp;pool, Quality const &amp;targetQuality, std::uint16_t const &amp;tfee)</div><div class="ttdoc">Generate AMM offer starting with takerGets when AMM pool from the payment perspective is IOU(in)/XRP(...</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8h_source.html#l00194">AMMHelpers.h:194</a></div></div>
<div class="ttc" id="anamespaceripple_html_a7894756905fee556c1541cd1de1f697a"><div class="ttname"><a href="namespaceripple.html#a7894756905fee556c1541cd1de1f697a">ripple::feeMult</a></div><div class="ttdeci">Number feeMult(std::uint16_t tfee)</div><div class="ttdoc">Get fee multiplier (1 - tfee) @tfee trading fee in basis points.</div><div class="ttdef"><b>Definition:</b> <a href="AMMCore_8h_source.html#l00110">AMMCore.h:110</a></div></div>
<div class="ttc" id="anamespaceripple_html_a90756d1bf92c06c33bd890299a680166"><div class="ttname"><a href="namespaceripple.html#a90756d1bf92c06c33bd890299a680166">ripple::changeSpotPriceQuality</a></div><div class="ttdeci">std::optional&lt; TAmounts&lt; TIn, TOut &gt; &gt; changeSpotPriceQuality(TAmounts&lt; TIn, TOut &gt; const &amp;pool, Quality const &amp;quality, std::uint16_t tfee, Rules const &amp;rules, beast::Journal j)</div><div class="ttdoc">Generate AMM offer so that either updated Spot Price Quality (SPQ) is equal to LOB quality (in this c...</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8h_source.html#l00329">AMMHelpers.h:329</a></div></div>
<div class="ttc" id="anamespaceripple_html_aa8871e2f35cee24497183274c0bab5fd"><div class="ttname"><a href="namespaceripple.html#aa8871e2f35cee24497183274c0bab5fd">ripple::getFee</a></div><div class="ttdeci">Number getFee(std::uint16_t tfee)</div><div class="ttdoc">Convert to the fee from the basis points.</div><div class="ttdef"><b>Definition:</b> <a href="AMMCore_8h_source.html#l00101">AMMCore.h:101</a></div></div>
<div class="ttc" id="anamespaceripple_html_ab8defa1f235abbf44a60ccc6c71c6fdd"><div class="ttname"><a href="namespaceripple.html#ab8defa1f235abbf44a60ccc6c71c6fdd">ripple::ammLPTokens</a></div><div class="ttdeci">STAmount ammLPTokens(STAmount const &amp;asset1, STAmount const &amp;asset2, Issue const &amp;lptIssue)</div><div class="ttdoc">Calculate LP Tokens given AMM pool reserves.</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8cpp_source.html#l00025">AMMHelpers.cpp:25</a></div></div>
<div class="ttc" id="anamespaceripple_html_ac124fe6744b7fe887dec949b56b16d50"><div class="ttname"><a href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">ripple::to_string</a></div><div class="ttdeci">std::string to_string(base_uint&lt; Bits, Tag &gt; const &amp;a)</div><div class="ttdef"><b>Definition:</b> <a href="base__uint_8h_source.html#l00630">base_uint.h:630</a></div></div>
<div class="ttc" id="anamespaceripple_html_ac46ee7ce49b6deed89f70a94924c416f"><div class="ttname"><a href="namespaceripple.html#ac46ee7ce49b6deed89f70a94924c416f">ripple::getCurrentTransactionRules</a></div><div class="ttdeci">std::optional&lt; Rules &gt; const &amp; getCurrentTransactionRules()</div><div class="ttdef"><b>Definition:</b> <a href="Rules_8cpp_source.html#l00047">Rules.cpp:47</a></div></div>
<div class="ttc" id="anamespaceripple_html_ae93fdcb47fcb2819770cde741b278677"><div class="ttname"><a href="namespaceripple.html#ae93fdcb47fcb2819770cde741b278677">ripple::getAMMOfferStartWithTakerPays</a></div><div class="ttdeci">std::optional&lt; TAmounts&lt; TIn, TOut &gt; &gt; getAMMOfferStartWithTakerPays(TAmounts&lt; TIn, TOut &gt; const &amp;pool, Quality const &amp;targetQuality, std::uint16_t tfee)</div><div class="ttdoc">Generate AMM offer starting with takerPays when AMM pool from the payment perspective is XRP(in)/IOU(...</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8h_source.html#l00265">AMMHelpers.h:265</a></div></div>
<div class="ttc" id="anamespaceripple_html_aea4620f7a5356019edee3be624729c6d"><div class="ttname"><a href="namespaceripple.html#aea4620f7a5356019edee3be624729c6d">ripple::withdrawByTokens</a></div><div class="ttdeci">STAmount withdrawByTokens(STAmount const &amp;assetBalance, STAmount const &amp;lptAMMBalance, STAmount const &amp;lpTokens, std::uint16_t tfee)</div><div class="ttdoc">Calculate asset withdrawal by tokens.</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8cpp_source.html#l00114">AMMHelpers.cpp:114</a></div></div>
<div class="ttc" id="anamespaceripple_html_aea954383230f579cb080646b898088a5"><div class="ttname"><a href="namespaceripple.html#aea954383230f579cb080646b898088a5">ripple::withinRelativeDistance</a></div><div class="ttdeci">bool withinRelativeDistance(Quality const &amp;calcQuality, Quality const &amp;reqQuality, Number const &amp;dist)</div><div class="ttdoc">Check if the relative distance between the qualities is within the requested distance.</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8h_source.html#l00127">AMMHelpers.h:127</a></div></div>
<div class="ttc" id="anamespaceripple_html_aecb9ae1add070266b1be59ff570ec713"><div class="ttname"><a href="namespaceripple.html#aecb9ae1add070266b1be59ff570ec713">ripple::root2</a></div><div class="ttdeci">Number root2(Number f)</div><div class="ttdef"><b>Definition:</b> <a href="Number_8cpp_source.html#l00701">Number.cpp:701</a></div></div>
<div class="ttc" id="anamespaceripple_html_affb9400cd4cf6d952445bf00803cc92f"><div class="ttname"><a href="namespaceripple.html#affb9400cd4cf6d952445bf00803cc92f">ripple::swapAssetOut</a></div><div class="ttdeci">TIn swapAssetOut(TAmounts&lt; TIn, TOut &gt; const &amp;pool, TOut const &amp;assetOut, std::uint16_t tfee)</div><div class="ttdoc">Swap assetOut out of the pool and swap in a proportional amount of the other asset.</div><div class="ttdef"><b>Definition:</b> <a href="AMMHelpers_8h_source.html#l00535">AMMHelpers.h:535</a></div></div>
<div class="ttc" id="aoptional_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a></div></div>
<div class="ttc" id="atuple_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/tuple.html">std::tuple</a></div></div>
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