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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_a6d14a898e5042b88feceb06bece5732.html">paths</a></li><li class="navelem"><a class="el" href="dir_4236dcdf923f97c252e0c826c4e7f6d7.html">detail</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="preprocessor">#include &lt;xrpld/app/paths/AMMLiquidity.h&gt;</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="preprocessor">#include &lt;xrpld/app/paths/AMMOffer.h&gt;</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span> </div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceripple.html">ripple</a> {</div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span> </div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> TIn, <span class="keyword">typename</span> TOut&gt;</div>
<div class="foldopen" id="foldopen00007" data-start="{" data-end="}">
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"><a class="line" href="classripple_1_1AMMLiquidity.html#ab64d5ee790ade8eea80a94449a0e120c"> 7</a></span><a class="code hl_function" href="classripple_1_1AMMLiquidity.html#ab64d5ee790ade8eea80a94449a0e120c">AMMLiquidity&lt;TIn, TOut&gt;::AMMLiquidity</a>(</div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span> <a class="code hl_class" href="classripple_1_1ReadView.html">ReadView</a> <span class="keyword">const</span>&amp; view,</div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span> <a class="code hl_class" href="classripple_1_1base__uint.html">AccountID</a> <span class="keyword">const</span>&amp; ammAccountID,</div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint32_t</a> tradingFee,</div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span> <a class="code hl_class" href="classripple_1_1Issue.html">Issue</a> <span class="keyword">const</span>&amp; <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569feda13b5bfe96f3e2fe411c9f66f4a582adf">in</a>,</div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span> <a class="code hl_class" href="classripple_1_1Issue.html">Issue</a> <span class="keyword">const</span>&amp; <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>,</div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> <a class="code hl_class" href="classripple_1_1AMMContext.html">AMMContext</a>&amp; ammContext,</div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> <a class="code hl_class" href="classbeast_1_1Journal.html">beast::Journal</a> j)</div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> : ammContext_(ammContext)</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> , ammAccountID_(ammAccountID)</div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> , tradingFee_(tradingFee)</div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> , issueIn_(<a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569feda13b5bfe96f3e2fe411c9f66f4a582adf">in</a>)</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> , issueOut_(<a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>)</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> , initialBalances_{fetchBalances(view)}</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> , j_(j)</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>}</div>
</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</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="l00026" name="l00026"></a><span class="lineno"> 26</span>TAmounts&lt;TIn, TOut&gt;</div>
<div class="foldopen" id="foldopen00027" data-start="{" data-end="}">
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"><a class="line" href="classripple_1_1AMMLiquidity.html#a90e392457e7f89d2ee5e2a5398b29aac"> 27</a></span><a class="code hl_function" href="classripple_1_1AMMLiquidity.html#a90e392457e7f89d2ee5e2a5398b29aac">AMMLiquidity&lt;TIn, TOut&gt;::fetchBalances</a>(<a class="code hl_class" href="classripple_1_1ReadView.html">ReadView</a> <span class="keyword">const</span>&amp; view)<span class="keyword"> const</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="keyword"></span>{</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">auto</span> <span class="keyword">const</span> assetIn = <a class="code hl_function" href="namespaceripple.html#ac7da6b05048137df6afafbcb4af6343a">ammAccountHolds</a>(view, ammAccountID_, issueIn_);</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">auto</span> <span class="keyword">const</span> assetOut = <a class="code hl_function" href="namespaceripple.html#ac7da6b05048137df6afafbcb4af6343a">ammAccountHolds</a>(view, ammAccountID_, issueOut_);</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// This should not happen.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <span class="keywordflow">if</span> (assetIn &lt; beast::zero || assetOut &lt; beast::zero)</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> Throw&lt;std::runtime_error&gt;(<span class="stringliteral">&quot;AMMLiquidity: invalid balances&quot;</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="keywordflow">return</span> TAmounts{get&lt;TIn&gt;(assetIn), get&lt;TOut&gt;(assetOut)};</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span>}</div>
</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> </div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</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="l00039" name="l00039"></a><span class="lineno"> 39</span>TAmounts&lt;TIn, TOut&gt;</div>
<div class="foldopen" id="foldopen00040" data-start="{" data-end="}">
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"><a class="line" href="classripple_1_1AMMLiquidity.html#afc3099a63d626321df693638c4b09b34"> 40</a></span><a class="code hl_function" href="classripple_1_1AMMLiquidity.html#afc3099a63d626321df693638c4b09b34">AMMLiquidity&lt;TIn, TOut&gt;::generateFibSeqOffer</a>(</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> TAmounts&lt;TIn, TOut&gt; <span class="keyword">const</span>&amp; balances)<span class="keyword"> const</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="keyword"></span>{</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> TAmounts&lt;TIn, TOut&gt; cur{};</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> cur.in = toAmount&lt;TIn&gt;(</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(balances.in),</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> InitialFibSeqPct * initialBalances_.in,</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534ade4db21da96eedd46544ea52ce11a6f2">Number::rounding_mode::upward</a>);</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> cur.out = <a class="code hl_function" href="namespaceripple.html#a46ef81e270b726cb937bec7c0e0c8115">swapAssetIn</a>(initialBalances_, cur.in, tradingFee_);</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keywordflow">if</span> (ammContext_.curIters() == 0)</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keywordflow">return</span> cur;</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> </div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="comment">// clang-format off</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">constexpr</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint32_t</a> fib[<a class="code hl_variable" href="classripple_1_1AMMContext.html#aea7e5358e70e509bed9b019bf6c8c79a">AMMContext::MaxIterations</a>] = {</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987,</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393,</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> 196418, 317811, 514229, 832040, 1346269};</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="comment">// clang-format on</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> XRPL_ASSERT(</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> !ammContext_.maxItersReached(),</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="stringliteral">&quot;ripple::AMMLiquidity::generateFibSeqOffer : maximum iterations&quot;</span>);</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> cur.out = toAmount&lt;TOut&gt;(</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <a class="code hl_function" href="namespaceripple.html#a35d75f3e8c1d99beb8c834d767070d8c">getIssue</a>(balances.out),</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> cur.out * fib[ammContext_.curIters() - 1],</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">Number::rounding_mode::downward</a>);</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="comment">// swapAssetOut() returns negative in this case</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keywordflow">if</span> (cur.out &gt;= balances.out)</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> Throw&lt;std::overflow_error&gt;(</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="stringliteral">&quot;AMMLiquidity: generateFibSeqOffer exceeds the balance&quot;</span>);</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> </div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> cur.in = <a class="code hl_function" href="namespaceripple.html#affb9400cd4cf6d952445bf00803cc92f">swapAssetOut</a>(balances, cur.out, tradingFee_);</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> </div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="keywordflow">return</span> cur;</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span>}</div>
</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> </div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span><span class="keyword">namespace </span>{</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span><span class="keyword">constexpr</span> T</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span>maxAmount()</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span>{</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="keywordflow">if</span> <span class="keyword">constexpr</span> (<a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same_v&lt;T, XRPAmount&gt;</a>)</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="keywordflow">return</span> <a class="code hl_class" href="classripple_1_1XRPAmount.html">XRPAmount</a>(<a class="code hl_variable" href="classripple_1_1STAmount.html#acb2157931ed34bae75c1bd43214f7ade">STAmount::cMaxNative</a>);</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> <span class="keyword">constexpr</span> (<a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same_v&lt;T, IOUAmount&gt;</a>)</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordflow">return</span> <a class="code hl_class" href="classripple_1_1IOUAmount.html">IOUAmount</a>(<a class="code hl_variable" href="classripple_1_1STAmount.html#aa0f01e6eacfb24a14b792ab8bd288de3">STAmount::cMaxValue</a> / 2, <a class="code hl_variable" href="classripple_1_1STAmount.html#a5392e4fd5eef1038f40b1d260b7ad1ae">STAmount::cMaxOffset</a>);</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> <span class="keyword">constexpr</span> (<a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same_v&lt;T, STAmount&gt;</a>)</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> <span class="keywordflow">return</span> <a class="code hl_class" href="classripple_1_1STAmount.html">STAmount</a>(<a class="code hl_variable" href="classripple_1_1STAmount.html#aa0f01e6eacfb24a14b792ab8bd288de3">STAmount::cMaxValue</a> / 2, <a class="code hl_variable" href="classripple_1_1STAmount.html#a5392e4fd5eef1038f40b1d260b7ad1ae">STAmount::cMaxOffset</a>);</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span>}</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span>T</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span>maxOut(T <span class="keyword">const</span>&amp; <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>, Issue <span class="keyword">const</span>&amp; iss)</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span>{</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> Number <span class="keyword">const</span> res = <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a> * Number{99, -2};</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <span class="keywordflow">return</span> toAmount&lt;T&gt;(iss, res, <a class="code hl_enumvalue" href="classripple_1_1Number.html#a33e3d8e7a95979bd1eb22c59703c8534a25a8f50fce6cbdd3a8c0a3aa20126324">Number::rounding_mode::downward</a>);</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span>}</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span>} <span class="comment">// namespace</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> </div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</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="l00102" name="l00102"></a><span class="lineno"> 102</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional&lt;AMMOffer&lt;TIn, TOut&gt;</a>&gt;</div>
<div class="foldopen" id="foldopen00103" data-start="{" data-end="}">
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"><a class="line" href="classripple_1_1AMMLiquidity.html#ab6752c49c9927eb6d07bb08f4418581e"> 103</a></span><a class="code hl_function" href="classripple_1_1AMMLiquidity.html#ab6752c49c9927eb6d07bb08f4418581e">AMMLiquidity&lt;TIn, TOut&gt;::maxOffer</a>(</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> TAmounts&lt;TIn, TOut&gt; <span class="keyword">const</span>&amp; balances,</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <a class="code hl_class" href="classripple_1_1Rules.html">Rules</a> <span class="keyword">const</span>&amp; rules)<span class="keyword"> const</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span><span class="keyword"></span>{</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> <span class="keywordflow">if</span> (!rules.<a class="code hl_function" href="classripple_1_1Rules.html#a1a8388a2b9588aa9446ece92a88e0dd2">enabled</a>(fixAMMOverflowOffer))</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> {</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> <span class="keywordflow">return</span> <a class="code hl_class" href="classripple_1_1AMMOffer.html">AMMOffer&lt;TIn, TOut&gt;</a>(</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> *<span class="keyword">this</span>,</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> {maxAmount&lt;TIn&gt;(),</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> <a class="code hl_function" href="namespaceripple.html#a46ef81e270b726cb937bec7c0e0c8115">swapAssetIn</a>(balances, maxAmount&lt;TIn&gt;(), tradingFee_)},</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> balances,</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> Quality{balances});</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> }</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> {</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> <span class="keyword">auto</span> <span class="keyword">const</span> <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a> = maxOut&lt;TOut&gt;(balances.out, issueOut());</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> <span class="keywordflow">if</span> (<a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a> &lt;= TOut{0} || <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a> &gt;= balances.out)</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> <span class="keywordflow">return</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::nullopt</a>;</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> <span class="keywordflow">return</span> <a class="code hl_class" href="classripple_1_1AMMOffer.html">AMMOffer&lt;TIn, TOut&gt;</a>(</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> *<span class="keyword">this</span>,</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> {<a class="code hl_function" href="namespaceripple.html#affb9400cd4cf6d952445bf00803cc92f">swapAssetOut</a>(balances, <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>, tradingFee_), <a class="code hl_enumvalue" href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">out</a>},</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> balances,</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> Quality{balances});</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> }</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span>}</div>
</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> </div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</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="l00130" name="l00130"></a><span class="lineno"> 130</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional&lt;AMMOffer&lt;TIn, TOut&gt;</a>&gt;</div>
<div class="foldopen" id="foldopen00131" data-start="{" data-end="}">
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"><a class="line" href="classripple_1_1AMMLiquidity.html#a4f40426bb36529ccba8ef2768e3c3bc9"> 131</a></span><a class="code hl_function" href="classripple_1_1AMMLiquidity.html#a4f40426bb36529ccba8ef2768e3c3bc9">AMMLiquidity&lt;TIn, TOut&gt;::getOffer</a>(</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> <a class="code hl_class" href="classripple_1_1ReadView.html">ReadView</a> <span class="keyword">const</span>&amp; view,</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional&lt;Quality&gt;</a> <span class="keyword">const</span>&amp; clobQuality)<span class="keyword"> const</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span><span class="keyword"></span>{</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="comment">// Can&#39;t generate more offers if multi-path.</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> <span class="keywordflow">if</span> (ammContext_.maxItersReached())</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> <span class="keywordflow">return</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::nullopt</a>;</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> </div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> <span class="keyword">auto</span> <span class="keyword">const</span> balances = fetchBalances(view);</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> </div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> <span class="comment">// Frozen accounts</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <span class="keywordflow">if</span> (balances.in == beast::zero || balances.out == beast::zero)</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> {</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> JLOG(j_.<a class="code hl_function" href="classbeast_1_1Journal.html#a556228cb60bcf405c225d3f64b7b01ae">debug</a>()) &lt;&lt; <span class="stringliteral">&quot;AMMLiquidity::getOffer, frozen accounts&quot;</span>;</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> <span class="keywordflow">return</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::nullopt</a>;</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> }</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> </div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> JLOG(j_.<a class="code hl_function" href="classbeast_1_1Journal.html#abbe082bd27ca0f1d1365af2824e4f85b">trace</a>()) &lt;&lt; <span class="stringliteral">&quot;AMMLiquidity::getOffer balances &quot;</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(initialBalances_.in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(initialBalances_.out) &lt;&lt; <span class="stringliteral">&quot; new balances &quot;</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(balances.in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(balances.out);</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> </div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> <span class="comment">// Can&#39;t generate AMM with a better quality than CLOB&#39;s</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> <span class="comment">// quality if AMM&#39;s Spot Price quality is less than CLOB quality or is</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> <span class="comment">// within a threshold.</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> <span class="comment">// Spot price quality (SPQ) is calculated within some precision threshold.</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> <span class="comment">// On the next iteration, after SPQ is changed, the new SPQ might be close</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> <span class="comment">// to the requested clobQuality but not exactly and potentially SPQ may keep</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> <span class="comment">// on approaching clobQuality for many iterations. Checking for the quality</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> <span class="comment">// threshold prevents this scenario.</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> <span class="keywordflow">if</span> (<span class="keyword">auto</span> <span class="keyword">const</span> spotPriceQ = Quality{balances}; clobQuality &amp;&amp;</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> (spotPriceQ &lt;= clobQuality ||</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> <a class="code hl_function" href="namespaceripple.html#aea954383230f579cb080646b898088a5">withinRelativeDistance</a>(spotPriceQ, *clobQuality, <a class="code hl_class" href="classripple_1_1Number.html">Number</a>(1, -7))))</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> {</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> JLOG(j_.<a class="code hl_function" href="classbeast_1_1Journal.html#abbe082bd27ca0f1d1365af2824e4f85b">trace</a>()) &lt;&lt; <span class="stringliteral">&quot;AMMLiquidity::getOffer, higher clob quality&quot;</span>;</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> <span class="keywordflow">return</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::nullopt</a>;</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> }</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> </div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> <span class="keyword">auto</span> offer = [&amp;]() -&gt; <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>&lt;<a class="code hl_class" href="classripple_1_1AMMOffer.html">AMMOffer&lt;TIn, TOut&gt;</a>&gt; {</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> <span class="keywordflow">try</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> {</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> <span class="keywordflow">if</span> (ammContext_.multiPath())</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> {</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> <span class="keyword">auto</span> <span class="keyword">const</span> amounts = generateFibSeqOffer(balances);</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> <span class="keywordflow">if</span> (clobQuality &amp;&amp; Quality{amounts} &lt; clobQuality)</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> <span class="keywordflow">return</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::nullopt</a>;</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> <span class="keywordflow">return</span> <a class="code hl_class" href="classripple_1_1AMMOffer.html">AMMOffer&lt;TIn, TOut&gt;</a>(</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> *<span class="keyword">this</span>, amounts, balances, Quality{amounts});</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> }</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!clobQuality)</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> {</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> <span class="comment">// If there is no CLOB to compare against, return the largest</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> <span class="comment">// amount, which doesn&#39;t overflow. The size is going to be</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> <span class="comment">// changed in BookStep per either deliver amount limit, or</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> <span class="comment">// sendmax, or available output or input funds. Might return</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> <span class="comment">// nullopt if the pool is small.</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> <span class="keywordflow">return</span> maxOffer(balances, view.<a class="code hl_function" href="classripple_1_1ReadView.html#aceb3d74acaae18b238022337e5f250ce">rules</a>());</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> }</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> <span class="keyword">auto</span> <span class="keyword">const</span> amounts = <a class="code hl_function" href="namespaceripple.html#a90756d1bf92c06c33bd890299a680166">changeSpotPriceQuality</a>(</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> balances, *clobQuality, tradingFee_, view.<a class="code hl_function" href="classripple_1_1ReadView.html#aceb3d74acaae18b238022337e5f250ce">rules</a>(), j_))</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> {</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> <span class="keywordflow">return</span> <a class="code hl_class" href="classripple_1_1AMMOffer.html">AMMOffer&lt;TIn, TOut&gt;</a>(</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> *<span class="keyword">this</span>, *amounts, balances, Quality{*amounts});</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> }</div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (view.<a class="code hl_function" href="classripple_1_1ReadView.html#aceb3d74acaae18b238022337e5f250ce">rules</a>().<a class="code hl_function" href="classripple_1_1Rules.html#a1a8388a2b9588aa9446ece92a88e0dd2">enabled</a>(fixAMMv1_2))</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> (<span class="keyword">auto</span> <span class="keyword">const</span> maxAMMOffer = maxOffer(balances, view.<a class="code hl_function" href="classripple_1_1ReadView.html#aceb3d74acaae18b238022337e5f250ce">rules</a>());</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span> maxAMMOffer &amp;&amp;</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span> Quality{maxAMMOffer-&gt;amount()} &gt; *clobQuality)</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span> <span class="keywordflow">return</span> maxAMMOffer;</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span> }</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> }</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> <span class="keywordflow">catch</span> (<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/error/overflow_error.html">std::overflow_error</a> <span class="keyword">const</span>&amp; e)</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span> {</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> JLOG(j_.<a class="code hl_function" href="classbeast_1_1Journal.html#a49b0713e65bb8e2c51b76fbf16252afe">error</a>()) &lt;&lt; <span class="stringliteral">&quot;AMMLiquidity::getOffer overflow &quot;</span> &lt;&lt; e.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/error/exception/what.html">what</a>();</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span> <span class="keywordflow">if</span> (!view.<a class="code hl_function" href="classripple_1_1ReadView.html#aceb3d74acaae18b238022337e5f250ce">rules</a>().<a class="code hl_function" href="classripple_1_1Rules.html#a1a8388a2b9588aa9446ece92a88e0dd2">enabled</a>(fixAMMOverflowOffer))</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span> <span class="keywordflow">return</span> maxOffer(balances, view.<a class="code hl_function" href="classripple_1_1ReadView.html#aceb3d74acaae18b238022337e5f250ce">rules</a>());</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span> <span class="keywordflow">return</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::nullopt</a>;</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="keywordflow">catch</span> (<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/error/exception.html">std::exception</a> <span class="keyword">const</span>&amp; e)</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span> {</div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span> JLOG(j_.<a class="code hl_function" href="classbeast_1_1Journal.html#a49b0713e65bb8e2c51b76fbf16252afe">error</a>()) &lt;&lt; <span class="stringliteral">&quot;AMMLiquidity::getOffer exception &quot;</span> &lt;&lt; e.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/error/exception/what.html">what</a>();</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span> }</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span> <span class="keywordflow">return</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::nullopt</a>;</div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span> }();</div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span> </div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span> <span class="keywordflow">if</span> (offer)</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="keywordflow">if</span> (offer-&gt;amount().in &gt; beast::zero &amp;&amp;</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"> 223</span> offer-&gt;amount().out &gt; beast::zero)</div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span> {</div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span> JLOG(j_.<a class="code hl_function" href="classbeast_1_1Journal.html#abbe082bd27ca0f1d1365af2824e4f85b">trace</a>())</div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span> &lt;&lt; <span class="stringliteral">&quot;AMMLiquidity::getOffer, created &quot;</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(offer-&gt;amount().in) &lt;&lt; <span class="stringliteral">&quot;/&quot;</span> &lt;&lt; issueIn_ &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(offer-&gt;amount().out) &lt;&lt; <span class="stringliteral">&quot;/&quot;</span> &lt;&lt; issueOut_;</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span> <span class="keywordflow">return</span> offer;</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> </div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno"> 232</span> JLOG(j_.<a class="code hl_function" href="classbeast_1_1Journal.html#a556228cb60bcf405c225d3f64b7b01ae">debug</a>()) &lt;&lt; <span class="stringliteral">&quot;AMMLiquidity::getOffer, no valid offer &quot;</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno"> 233</span> &lt;&lt; ammContext_.multiPath() &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno"> 234</span> &lt;&lt; ammContext_.curIters() &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"> 235</span> &lt;&lt; (clobQuality ? clobQuality-&gt;rate() : <a class="code hl_class" href="classripple_1_1STAmount.html">STAmount</a>{})</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span> &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(balances.in) &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span> &lt;&lt; <a class="code hl_function" href="namespaceripple.html#ac124fe6744b7fe887dec949b56b16d50">to_string</a>(balances.out);</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="l00240" name="l00240"></a><span class="lineno"> 240</span> <span class="keywordflow">return</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::nullopt</a>;</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno"> 241</span>}</div>
</div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno"> 242</span> </div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno"> 243</span><span class="keyword">template</span> <span class="keyword">class </span><a class="code hl_class" href="classripple_1_1AMMLiquidity.html">AMMLiquidity&lt;STAmount, STAmount&gt;</a>;</div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span><span class="keyword">template</span> <span class="keyword">class </span><a class="code hl_class" href="classripple_1_1AMMLiquidity.html">AMMLiquidity&lt;IOUAmount, IOUAmount&gt;</a>;</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span><span class="keyword">template</span> <span class="keyword">class </span><a class="code hl_class" href="classripple_1_1AMMLiquidity.html">AMMLiquidity&lt;XRPAmount, IOUAmount&gt;</a>;</div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span><span class="keyword">template</span> <span class="keyword">class </span><a class="code hl_class" href="classripple_1_1AMMLiquidity.html">AMMLiquidity&lt;IOUAmount, XRPAmount&gt;</a>;</div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span> </div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"> 248</span>} <span class="comment">// namespace ripple</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#l00040">Journal.h:41</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#l00327">Journal.h:327</a></div></div>
<div class="ttc" id="aclassbeast_1_1Journal_html_a556228cb60bcf405c225d3f64b7b01ae"><div class="ttname"><a href="classbeast_1_1Journal.html#a556228cb60bcf405c225d3f64b7b01ae">beast::Journal::debug</a></div><div class="ttdeci">Stream debug() const</div><div class="ttdef"><b>Definition</b> <a href="Journal_8h_source.html#l00309">Journal.h:309</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#l00303">Journal.h:303</a></div></div>
<div class="ttc" id="aclassripple_1_1AMMContext_html"><div class="ttname"><a href="classripple_1_1AMMContext.html">ripple::AMMContext</a></div><div class="ttdoc">Maintains AMM info per overall payment engine execution and individual iteration.</div><div class="ttdef"><b>Definition</b> <a href="AMMContext_8h_source.html#l00016">AMMContext.h:17</a></div></div>
<div class="ttc" id="aclassripple_1_1AMMContext_html_aea7e5358e70e509bed9b019bf6c8c79a"><div class="ttname"><a href="classripple_1_1AMMContext.html#aea7e5358e70e509bed9b019bf6c8c79a">ripple::AMMContext::MaxIterations</a></div><div class="ttdeci">static constexpr std::uint8_t MaxIterations</div><div class="ttdef"><b>Definition</b> <a href="AMMContext_8h_source.html#l00022">AMMContext.h:22</a></div></div>
<div class="ttc" id="aclassripple_1_1AMMLiquidity_html"><div class="ttname"><a href="classripple_1_1AMMLiquidity.html">ripple::AMMLiquidity</a></div><div class="ttdoc">AMMLiquidity class provides AMM offers to BookStep class.</div><div class="ttdef"><b>Definition</b> <a href="AMMLiquidity_8h_source.html#l00033">AMMLiquidity.h:34</a></div></div>
<div class="ttc" id="aclassripple_1_1AMMLiquidity_html_a4f40426bb36529ccba8ef2768e3c3bc9"><div class="ttname"><a href="classripple_1_1AMMLiquidity.html#a4f40426bb36529ccba8ef2768e3c3bc9">ripple::AMMLiquidity::getOffer</a></div><div class="ttdeci">std::optional&lt; AMMOffer&lt; TIn, TOut &gt; &gt; getOffer(ReadView const &amp;view, std::optional&lt; Quality &gt; const &amp;clobQuality) const</div><div class="ttdoc">Generate AMM offer.</div><div class="ttdef"><b>Definition</b> <a href="AMMLiquidity_8cpp_source.html#l00131">AMMLiquidity.cpp:131</a></div></div>
<div class="ttc" id="aclassripple_1_1AMMLiquidity_html_a90e392457e7f89d2ee5e2a5398b29aac"><div class="ttname"><a href="classripple_1_1AMMLiquidity.html#a90e392457e7f89d2ee5e2a5398b29aac">ripple::AMMLiquidity::fetchBalances</a></div><div class="ttdeci">TAmounts&lt; TIn, TOut &gt; fetchBalances(ReadView const &amp;view) const</div><div class="ttdoc">Fetches current AMM balances.</div><div class="ttdef"><b>Definition</b> <a href="AMMLiquidity_8cpp_source.html#l00027">AMMLiquidity.cpp:27</a></div></div>
<div class="ttc" id="aclassripple_1_1AMMLiquidity_html_ab64d5ee790ade8eea80a94449a0e120c"><div class="ttname"><a href="classripple_1_1AMMLiquidity.html#ab64d5ee790ade8eea80a94449a0e120c">ripple::AMMLiquidity::AMMLiquidity</a></div><div class="ttdeci">AMMLiquidity(ReadView const &amp;view, AccountID const &amp;ammAccountID, std::uint32_t tradingFee, Issue const &amp;in, Issue const &amp;out, AMMContext &amp;ammContext, beast::Journal j)</div><div class="ttdef"><b>Definition</b> <a href="AMMLiquidity_8cpp_source.html#l00007">AMMLiquidity.cpp:7</a></div></div>
<div class="ttc" id="aclassripple_1_1AMMLiquidity_html_ab6752c49c9927eb6d07bb08f4418581e"><div class="ttname"><a href="classripple_1_1AMMLiquidity.html#ab6752c49c9927eb6d07bb08f4418581e">ripple::AMMLiquidity::maxOffer</a></div><div class="ttdeci">std::optional&lt; AMMOffer&lt; TIn, TOut &gt; &gt; maxOffer(TAmounts&lt; TIn, TOut &gt; const &amp;balances, Rules const &amp;rules) const</div><div class="ttdoc">Generate max offer.</div><div class="ttdef"><b>Definition</b> <a href="AMMLiquidity_8cpp_source.html#l00103">AMMLiquidity.cpp:103</a></div></div>
<div class="ttc" id="aclassripple_1_1AMMLiquidity_html_afc3099a63d626321df693638c4b09b34"><div class="ttname"><a href="classripple_1_1AMMLiquidity.html#afc3099a63d626321df693638c4b09b34">ripple::AMMLiquidity::generateFibSeqOffer</a></div><div class="ttdeci">TAmounts&lt; TIn, TOut &gt; generateFibSeqOffer(TAmounts&lt; TIn, TOut &gt; const &amp;balances) const</div><div class="ttdoc">Generate AMM offers with the offer size based on Fibonacci sequence.</div><div class="ttdef"><b>Definition</b> <a href="AMMLiquidity_8cpp_source.html#l00040">AMMLiquidity.cpp:40</a></div></div>
<div class="ttc" id="aclassripple_1_1AMMOffer_html"><div class="ttname"><a href="classripple_1_1AMMOffer.html">ripple::AMMOffer</a></div><div class="ttdoc">Represents synthetic AMM offer in BookStep.</div><div class="ttdef"><b>Definition</b> <a href="AMMOffer_8h_source.html#l00020">AMMOffer.h:21</a></div></div>
<div class="ttc" id="aclassripple_1_1IOUAmount_html"><div class="ttname"><a href="classripple_1_1IOUAmount.html">ripple::IOUAmount</a></div><div class="ttdoc">Floating point representation of amounts with high dynamic range.</div><div class="ttdef"><b>Definition</b> <a href="IOUAmount_8h_source.html#l00025">IOUAmount.h:27</a></div></div>
<div class="ttc" id="aclassripple_1_1Issue_html"><div class="ttname"><a href="classripple_1_1Issue.html">ripple::Issue</a></div><div class="ttdoc">A currency issued by an account.</div><div class="ttdef"><b>Definition</b> <a href="Issue_8h_source.html#l00013">Issue.h:14</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#l00016">Number.h:17</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#l00177">Number.h:177</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#l00177">Number.h:177</a></div></div>
<div class="ttc" id="aclassripple_1_1ReadView_html"><div class="ttname"><a href="classripple_1_1ReadView.html">ripple::ReadView</a></div><div class="ttdoc">A view into a ledger.</div><div class="ttdef"><b>Definition</b> <a href="ReadView_8h_source.html#l00031">ReadView.h:32</a></div></div>
<div class="ttc" id="aclassripple_1_1ReadView_html_aceb3d74acaae18b238022337e5f250ce"><div class="ttname"><a href="classripple_1_1ReadView.html#aceb3d74acaae18b238022337e5f250ce">ripple::ReadView::rules</a></div><div class="ttdeci">virtual Rules const &amp; rules() const =0</div><div class="ttdoc">Returns the tx processing rules.</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#l00018">Rules.h:19</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#l00111">Rules.cpp:111</a></div></div>
<div class="ttc" id="aclassripple_1_1STAmount_html"><div class="ttname"><a href="classripple_1_1STAmount.html">ripple::STAmount</a></div><div class="ttdef"><b>Definition</b> <a href="STAmount_8h_source.html#l00030">STAmount.h:31</a></div></div>
<div class="ttc" id="aclassripple_1_1STAmount_html_a5392e4fd5eef1038f40b1d260b7ad1ae"><div class="ttname"><a href="classripple_1_1STAmount.html#a5392e4fd5eef1038f40b1d260b7ad1ae">ripple::STAmount::cMaxOffset</a></div><div class="ttdeci">static int const cMaxOffset</div><div class="ttdef"><b>Definition</b> <a href="STAmount_8h_source.html#l00047">STAmount.h:47</a></div></div>
<div class="ttc" id="aclassripple_1_1STAmount_html_aa0f01e6eacfb24a14b792ab8bd288de3"><div class="ttname"><a href="classripple_1_1STAmount.html#aa0f01e6eacfb24a14b792ab8bd288de3">ripple::STAmount::cMaxValue</a></div><div class="ttdeci">static std::uint64_t const cMaxValue</div><div class="ttdef"><b>Definition</b> <a href="STAmount_8h_source.html#l00051">STAmount.h:51</a></div></div>
<div class="ttc" id="aclassripple_1_1STAmount_html_acb2157931ed34bae75c1bd43214f7ade"><div class="ttname"><a href="classripple_1_1STAmount.html#acb2157931ed34bae75c1bd43214f7ade">ripple::STAmount::cMaxNative</a></div><div class="ttdeci">static std::uint64_t const cMaxNative</div><div class="ttdef"><b>Definition</b> <a href="STAmount_8h_source.html#l00052">STAmount.h:52</a></div></div>
<div class="ttc" id="aclassripple_1_1XRPAmount_html"><div class="ttname"><a href="classripple_1_1XRPAmount.html">ripple::XRPAmount</a></div><div class="ttdef"><b>Definition</b> <a href="XRPAmount_8h_source.html#l00020">XRPAmount.h:24</a></div></div>
<div class="ttc" id="aclassripple_1_1base__uint_html"><div class="ttname"><a href="classripple_1_1base__uint.html">ripple::base_uint&lt; 160, detail::AccountIDTag &gt;</a></div></div>
<div class="ttc" id="aexception_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/error/exception.html">std::exception</a></div></div>
<div class="ttc" id="ainteger_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint32_t</a></div></div>
<div class="ttc" id="ais_same_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same_v</a></div><div class="ttdeci">T is_same_v</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#l00006">algorithm.h:6</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#l00167">AmountConversions.h:167</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#l00445">AMMHelpers.h:445</a></div></div>
<div class="ttc" id="anamespaceripple_html_a7cc64e12723fbc9606d85442a2569feda13b5bfe96f3e2fe411c9f66f4a582adf"><div class="ttname"><a href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569feda13b5bfe96f3e2fe411c9f66f4a582adf">ripple::QualityDirection::in</a></div><div class="ttdeci">@ in</div></div>
<div class="ttc" id="anamespaceripple_html_a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275"><div class="ttname"><a href="namespaceripple.html#a7cc64e12723fbc9606d85442a2569fedac68271a63ddbc431c307beb7d2918275">ripple::QualityDirection::out</a></div><div class="ttdeci">@ out</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#l00312">AMMHelpers.h:312</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#l00611">base_uint.h:611</a></div></div>
<div class="ttc" id="anamespaceripple_html_ac7da6b05048137df6afafbcb4af6343a"><div class="ttname"><a href="namespaceripple.html#ac7da6b05048137df6afafbcb4af6343a">ripple::ammAccountHolds</a></div><div class="ttdeci">STAmount ammAccountHolds(ReadView const &amp;view, AccountID const &amp;ammAccountID, Issue const &amp;issue)</div><div class="ttdoc">Returns total amount held by AMM for the given token.</div><div class="ttdef"><b>Definition</b> <a href="AMMUtils_8cpp_source.html#l00192">AMMUtils.cpp:192</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#l00110">AMMHelpers.h:110</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#l00518">AMMHelpers.h:518</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="aoverflow_error_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/error/overflow_error.html">std::overflow_error</a></div></div>
<div class="ttc" id="awhat_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/error/exception/what.html">std::overflow_error::what</a></div><div class="ttdeci">T what(T... args)</div></div>
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