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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_0103a8ad82dcc2c51f5cde661b4b5cb7.html">xrpl</a></li><li class="navelem"><a class="el" href="dir_8d04e3c0b58cad28d7755ed462d1b6c0.html">protocol</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">#ifndef XRPL_PROTOCOL_QUALITYFUNCTION_H_INCLUDED</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="preprocessor">#define XRPL_PROTOCOL_QUALITYFUNCTION_H_INCLUDED</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="preprocessor">#include &lt;xrpl/basics/Number.h&gt;</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#include &lt;xrpl/protocol/AMMCore.h&gt;</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="preprocessor">#include &lt;xrpl/protocol/Quality.h&gt;</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacexrpl.html">xrpl</a> {</div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span> </div>
<div class="foldopen" id="foldopen00020" data-start="{" data-end="};">
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"><a class="line" href="classxrpl_1_1QualityFunction.html"> 20</a></span><span class="keyword">class </span><a class="code hl_class" href="classxrpl_1_1QualityFunction.html">QualityFunction</a></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span>{</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// slope</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"><a class="line" href="classxrpl_1_1QualityFunction.html#a233eeaaa0687fae7557b7bfc465de156"> 24</a></span> <a class="code hl_class" href="classxrpl_1_1Number.html">Number</a> <a class="code hl_variable" href="classxrpl_1_1QualityFunction.html#a233eeaaa0687fae7557b7bfc465de156">m_</a>;</div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// intercept</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"><a class="line" href="classxrpl_1_1QualityFunction.html#a4dee87f76b8e5e3b0743500f04efa6e8"> 26</a></span> <a class="code hl_class" href="classxrpl_1_1Number.html">Number</a> <a class="code hl_variable" href="classxrpl_1_1QualityFunction.html#a4dee87f76b8e5e3b0743500f04efa6e8">b_</a>;</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// seated if QF is for CLOB offer.</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"><a class="line" href="classxrpl_1_1QualityFunction.html#a5442aabd23605cdf2116735f3bdde3f9"> 28</a></span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional&lt;Quality&gt;</a> <a class="code hl_variable" href="classxrpl_1_1QualityFunction.html#a5442aabd23605cdf2116735f3bdde3f9">quality_</a>;</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="keyword">public</span>:</div>
<div class="foldopen" id="foldopen00031" data-start="{" data-end="};">
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"><a class="line" href="structxrpl_1_1QualityFunction_1_1AMMTag.html"> 31</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structxrpl_1_1QualityFunction_1_1AMMTag.html">AMMTag</a></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> {</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> };</div>
</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// AMMOffer for multi-path is like CLOB, i.e. the offer size</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// changes proportionally to its quality.</span></div>
<div class="foldopen" id="foldopen00036" data-start="{" data-end="};">
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"><a class="line" href="structxrpl_1_1QualityFunction_1_1CLOBLikeTag.html"> 36</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structxrpl_1_1QualityFunction_1_1CLOBLikeTag.html">CLOBLikeTag</a></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> };</div>
</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <a class="code hl_class" href="classxrpl_1_1QualityFunction.html">QualityFunction</a>(Quality <span class="keyword">const</span>&amp; <a class="code hl_function" href="classxrpl_1_1QualityFunction.html#a169686ee2b75e82dde8cf374236da6df">quality</a>, <a class="code hl_struct" href="structxrpl_1_1QualityFunction_1_1CLOBLikeTag.html">CLOBLikeTag</a>);</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</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="l00041" name="l00041"></a><span class="lineno"> 41</span> <a class="code hl_class" href="classxrpl_1_1QualityFunction.html">QualityFunction</a>(TAmounts&lt;TIn, TOut&gt; <span class="keyword">const</span>&amp; amounts, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint32_t</a> tfee, <a class="code hl_struct" href="structxrpl_1_1QualityFunction_1_1AMMTag.html">AMMTag</a>);</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keywordtype">void</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <a class="code hl_function" href="classxrpl_1_1QualityFunction.html#a2838564bffb1101560223bcf315126f7">combine</a>(<a class="code hl_class" href="classxrpl_1_1QualityFunction.html">QualityFunction</a> <span class="keyword">const</span>&amp; qf);</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</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="l00053" name="l00053"></a><span class="lineno"> 53</span> <a class="code hl_function" href="classxrpl_1_1QualityFunction.html#a7091a3af64bdc7d9f24c6c37f1ff7553">outFromAvgQ</a>(Quality <span class="keyword">const</span>&amp; <a class="code hl_function" href="classxrpl_1_1QualityFunction.html#a169686ee2b75e82dde8cf374236da6df">quality</a>);</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> </div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="keywordtype">bool</span></div>
<div class="foldopen" id="foldopen00058" data-start="{" data-end="}">
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"><a class="line" href="classxrpl_1_1QualityFunction.html#adfd7e1d05e9198cc5ce3a0ea38824444"> 58</a></span> <a class="code hl_function" href="classxrpl_1_1QualityFunction.html#adfd7e1d05e9198cc5ce3a0ea38824444">isConst</a>()<span class="keyword"> const</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span><span class="keyword"> </span>{</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordflow">return</span> <a class="code hl_variable" href="classxrpl_1_1QualityFunction.html#a5442aabd23605cdf2116735f3bdde3f9">quality_</a>.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/utility/optional/operator_bool.html">has_value</a>();</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> }</div>
</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</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;</div>
<div class="foldopen" id="foldopen00064" data-start="{" data-end="}">
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"><a class="line" href="classxrpl_1_1QualityFunction.html#a169686ee2b75e82dde8cf374236da6df"> 64</a></span> <a class="code hl_function" href="classxrpl_1_1QualityFunction.html#a169686ee2b75e82dde8cf374236da6df">quality</a>()<span class="keyword"> const</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="keyword"> </span>{</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordflow">return</span> <a class="code hl_variable" href="classxrpl_1_1QualityFunction.html#a5442aabd23605cdf2116735f3bdde3f9">quality_</a>;</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> }</div>
</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span>};</div>
</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</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="foldopen00071" data-start="{" data-end="}">
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"><a class="line" href="classxrpl_1_1QualityFunction.html#ae1875611676a0bc91d54d35c0c7f99ef"> 71</a></span><a class="code hl_function" href="classxrpl_1_1QualityFunction.html#a1f8042e1cd30697693bcec2e2c1dc31c">QualityFunction::QualityFunction</a>(TAmounts&lt;TIn, TOut&gt; <span class="keyword">const</span>&amp; amounts, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint32_t</a> tfee, <a class="code hl_struct" href="structxrpl_1_1QualityFunction_1_1AMMTag.html">QualityFunction::AMMTag</a>)</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span>{</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keywordflow">if</span> (amounts.in &lt;= beast::zero || amounts.out &lt;= beast::zero)</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> Throw&lt;std::runtime_error&gt;(<span class="stringliteral">&quot;QualityFunction amounts are 0.&quot;</span>);</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <a class="code hl_class" href="classxrpl_1_1Number.html">Number</a> <span class="keyword">const</span> cfee = <a class="code hl_function" href="namespacexrpl.html#aa0a361beb4e49cb6a4653ec984d997dc">feeMult</a>(tfee);</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <a class="code hl_variable" href="classxrpl_1_1QualityFunction.html#a233eeaaa0687fae7557b7bfc465de156">m_</a> = -cfee / amounts.in;</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <a class="code hl_variable" href="classxrpl_1_1QualityFunction.html#a4dee87f76b8e5e3b0743500f04efa6e8">b_</a> = amounts.out * cfee / amounts.in;</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span>}</div>
</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span>} <span class="comment">// namespace xrpl</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> </div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span><span class="preprocessor">#endif </span><span class="comment">// XRPL_PROTOCOL_QUALITYFUNCTION_H_INCLUDED</span></div>
<div class="ttc" id="aclassxrpl_1_1Number_html"><div class="ttname"><a href="classxrpl_1_1Number.html">xrpl::Number</a></div><div class="ttdoc">Number is a floating point type that can represent a wide range of values.</div><div class="ttdef"><b>Definition</b> <a href="Number_8h_source.html#l00207">Number.h:208</a></div></div>
<div class="ttc" id="aclassxrpl_1_1QualityFunction_html"><div class="ttname"><a href="classxrpl_1_1QualityFunction.html">xrpl::QualityFunction</a></div><div class="ttdoc">Average quality of a path as a function of out: q(out) = m * out + b, where m = -1 / poolGets,...</div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8h_source.html#l00020">QualityFunction.h:21</a></div></div>
<div class="ttc" id="aclassxrpl_1_1QualityFunction_html_a169686ee2b75e82dde8cf374236da6df"><div class="ttname"><a href="classxrpl_1_1QualityFunction.html#a169686ee2b75e82dde8cf374236da6df">xrpl::QualityFunction::quality</a></div><div class="ttdeci">std::optional&lt; Quality &gt; const &amp; quality() const</div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8h_source.html#l00064">QualityFunction.h:64</a></div></div>
<div class="ttc" id="aclassxrpl_1_1QualityFunction_html_a1f8042e1cd30697693bcec2e2c1dc31c"><div class="ttname"><a href="classxrpl_1_1QualityFunction.html#a1f8042e1cd30697693bcec2e2c1dc31c">xrpl::QualityFunction::QualityFunction</a></div><div class="ttdeci">QualityFunction(Quality const &amp;quality, CLOBLikeTag)</div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8cpp_source.html#l00012">QualityFunction.cpp:12</a></div></div>
<div class="ttc" id="aclassxrpl_1_1QualityFunction_html_a233eeaaa0687fae7557b7bfc465de156"><div class="ttname"><a href="classxrpl_1_1QualityFunction.html#a233eeaaa0687fae7557b7bfc465de156">xrpl::QualityFunction::m_</a></div><div class="ttdeci">Number m_</div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8h_source.html#l00024">QualityFunction.h:24</a></div></div>
<div class="ttc" id="aclassxrpl_1_1QualityFunction_html_a2838564bffb1101560223bcf315126f7"><div class="ttname"><a href="classxrpl_1_1QualityFunction.html#a2838564bffb1101560223bcf315126f7">xrpl::QualityFunction::combine</a></div><div class="ttdeci">void combine(QualityFunction const &amp;qf)</div><div class="ttdoc">Combines QF with the next step QF.</div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8cpp_source.html#l00020">QualityFunction.cpp:20</a></div></div>
<div class="ttc" id="aclassxrpl_1_1QualityFunction_html_a4dee87f76b8e5e3b0743500f04efa6e8"><div class="ttname"><a href="classxrpl_1_1QualityFunction.html#a4dee87f76b8e5e3b0743500f04efa6e8">xrpl::QualityFunction::b_</a></div><div class="ttdeci">Number b_</div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8h_source.html#l00026">QualityFunction.h:26</a></div></div>
<div class="ttc" id="aclassxrpl_1_1QualityFunction_html_a5442aabd23605cdf2116735f3bdde3f9"><div class="ttname"><a href="classxrpl_1_1QualityFunction.html#a5442aabd23605cdf2116735f3bdde3f9">xrpl::QualityFunction::quality_</a></div><div class="ttdeci">std::optional&lt; Quality &gt; quality_</div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8h_source.html#l00028">QualityFunction.h:28</a></div></div>
<div class="ttc" id="aclassxrpl_1_1QualityFunction_html_a7091a3af64bdc7d9f24c6c37f1ff7553"><div class="ttname"><a href="classxrpl_1_1QualityFunction.html#a7091a3af64bdc7d9f24c6c37f1ff7553">xrpl::QualityFunction::outFromAvgQ</a></div><div class="ttdeci">std::optional&lt; Number &gt; outFromAvgQ(Quality const &amp;quality)</div><div class="ttdoc">Find output to produce the requested average quality.</div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8cpp_source.html#l00029">QualityFunction.cpp:29</a></div></div>
<div class="ttc" id="aclassxrpl_1_1QualityFunction_html_adfd7e1d05e9198cc5ce3a0ea38824444"><div class="ttname"><a href="classxrpl_1_1QualityFunction.html#adfd7e1d05e9198cc5ce3a0ea38824444">xrpl::QualityFunction::isConst</a></div><div class="ttdeci">bool isConst() const</div><div class="ttdoc">Return true if the quality function is constant.</div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8h_source.html#l00058">QualityFunction.h:58</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="anamespacexrpl_html"><div class="ttname"><a href="namespacexrpl.html">xrpl</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="anamespacexrpl_html_aa0a361beb4e49cb6a4653ec984d997dc"><div class="ttname"><a href="namespacexrpl.html#aa0a361beb4e49cb6a4653ec984d997dc">xrpl::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#l00085">AMMCore.h:85</a></div></div>
<div class="ttc" id="aoperator_bool_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/optional/operator_bool.html">std::optional::has_value</a></div><div class="ttdeci">T has_value(T... args)</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="astructxrpl_1_1QualityFunction_1_1AMMTag_html"><div class="ttname"><a href="structxrpl_1_1QualityFunction_1_1AMMTag.html">xrpl::QualityFunction::AMMTag</a></div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8h_source.html#l00031">QualityFunction.h:32</a></div></div>
<div class="ttc" id="astructxrpl_1_1QualityFunction_1_1CLOBLikeTag_html"><div class="ttname"><a href="structxrpl_1_1QualityFunction_1_1CLOBLikeTag.html">xrpl::QualityFunction::CLOBLikeTag</a></div><div class="ttdef"><b>Definition</b> <a href="QualityFunction_8h_source.html#l00036">QualityFunction.h:37</a></div></div>
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