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<div class="title">LoadFeeTrack.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">//------------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> This file is part of rippled: https://github.com/ripple/rippled</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> Copyright (c) 2012, 2013 Ripple Labs Inc.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> Permission to use, copy, modify, and/or distribute this software for any</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> purpose with or without fee is hereby granted, provided that the above</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> copyright notice and this permission notice appear in all copies.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment">*/</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="comment">//==============================================================================</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160; </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="preprocessor">#include &lt;ripple/app/misc/LoadFeeTrack.h&gt;</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="preprocessor">#include &lt;ripple/basics/contract.h&gt;</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="preprocessor">#include &lt;ripple/basics/FeeUnits.h&gt;</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor">#include &lt;ripple/basics/Log.h&gt;</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="preprocessor">#include &lt;ripple/basics/safe_cast.h&gt;</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="preprocessor">#include &lt;ripple/core/Config.h&gt;</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="preprocessor">#include &lt;ripple/ledger/ReadView.h&gt;</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="preprocessor">#include &lt;ripple/protocol/jss.h&gt;</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="preprocessor">#include &lt;ripple/protocol/STAmount.h&gt;</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/cstdint.html">cstdint</a>&gt;</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/numeric.html">numeric</a>&gt;</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/type_traits.html">type_traits</a>&gt;</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceripple.html">ripple</a> {</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; </div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="keywordtype">bool</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classripple_1_1LoadFeeTrack.html#a219cf201607ad178eaca2c02b1efd928"> 37</a></span>&#160;<a class="code" href="classripple_1_1LoadFeeTrack.html#a219cf201607ad178eaca2c02b1efd928">LoadFeeTrack::raiseLocalFee</a> ()</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;{</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <a class="codeRef" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard</a> sl (<a class="code" href="classripple_1_1LoadFeeTrack.html#a360c8a7d8793170c4f0207268edcac01">lock_</a>);</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; <span class="keywordflow">if</span> (++<a class="code" href="classripple_1_1LoadFeeTrack.html#a66a12889d1d04e74629adcfa5c1b1c40">raiseCount_</a> &lt; 2)</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <a class="codeRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint32_t</a> origFee = <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a>;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="comment">// make sure this fee takes effect</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; <span class="keywordflow">if</span> (<a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a> &lt; <a class="code" href="classripple_1_1LoadFeeTrack.html#a98e34e4167268fc92dc4b6a34bc22962">remoteTxnLoadFee_</a>)</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a> = <a class="code" href="classripple_1_1LoadFeeTrack.html#a98e34e4167268fc92dc4b6a34bc22962">remoteTxnLoadFee_</a>;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; </div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="comment">// Increase slowly</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a> += (<a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a> / <a class="code" href="classripple_1_1LoadFeeTrack.html#a887986ce18f0bfddb0325f939c235cf0">lftFeeIncFraction</a>);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; </div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keywordflow">if</span> (<a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a> &gt; <a class="code" href="classripple_1_1LoadFeeTrack.html#a02e78475b96f9515007dd272b7f05421">lftFeeMax</a>)</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a> = <a class="code" href="classripple_1_1LoadFeeTrack.html#a02e78475b96f9515007dd272b7f05421">lftFeeMax</a>;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="keywordflow">if</span> (origFee == <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a>)</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; </div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; JLOG(<a class="code" href="classripple_1_1LoadFeeTrack.html#a5b1924f5ce8d3be0956d549c57aede7a">j_</a>.<a class="code" href="classbeast_1_1Journal.html#a556228cb60bcf405c225d3f64b7b01ae">debug</a>()) &lt;&lt; <span class="stringliteral">&quot;Local load fee raised from &quot;</span> &lt;&lt;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; origFee &lt;&lt; <span class="stringliteral">&quot; to &quot;</span> &lt;&lt; <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a>;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;}</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;<span class="keywordtype">bool</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"><a class="line" href="classripple_1_1LoadFeeTrack.html#a79fc4e5d274dcd9308348f3e49145bc6"> 65</a></span>&#160;<a class="code" href="classripple_1_1LoadFeeTrack.html#a79fc4e5d274dcd9308348f3e49145bc6">LoadFeeTrack::lowerLocalFee</a> ()</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;{</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <a class="codeRef" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard</a> sl (<a class="code" href="classripple_1_1LoadFeeTrack.html#a360c8a7d8793170c4f0207268edcac01">lock_</a>);</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <a class="codeRef" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint32_t</a> origFee = <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a>;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <a class="code" href="classripple_1_1LoadFeeTrack.html#a66a12889d1d04e74629adcfa5c1b1c40">raiseCount_</a> = 0;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; </div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="comment">// Reduce slowly</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a> -= (<a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a> / <a class="code" href="classripple_1_1LoadFeeTrack.html#a05e1508b6d79d256e2200a8b7a5dbc09">lftFeeDecFraction</a> );</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="keywordflow">if</span> (<a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a> &lt; <a class="code" href="classripple_1_1LoadFeeTrack.html#a50fac4a0863274aa1c6c2719d2a309bf">lftNormalFee</a>)</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a> = <a class="code" href="classripple_1_1LoadFeeTrack.html#a50fac4a0863274aa1c6c2719d2a309bf">lftNormalFee</a>;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; <span class="keywordflow">if</span> (origFee == <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a>)</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; </div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; JLOG(<a class="code" href="classripple_1_1LoadFeeTrack.html#a5b1924f5ce8d3be0956d549c57aede7a">j_</a>.<a class="code" href="classbeast_1_1Journal.html#a556228cb60bcf405c225d3f64b7b01ae">debug</a>()) &lt;&lt; <span class="stringliteral">&quot;Local load fee lowered from &quot;</span> &lt;&lt;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; origFee &lt;&lt; <span class="stringliteral">&quot; to &quot;</span> &lt;&lt; <a class="code" href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">localTxnLoadFee_</a>;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;}</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;<span class="comment">//------------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160;<span class="comment">// Scale using load as well as base rate</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;<a class="code" href="classripple_1_1XRPAmount.html">XRPAmount</a></div>
<div class="line"><a name="l00089"></a><span class="lineno"><a class="line" href="namespaceripple.html#a567b532d8246f4f0adde7d57c2ffa370"> 89</a></span>&#160;<a class="code" href="namespaceripple.html#a567b532d8246f4f0adde7d57c2ffa370">scaleFeeLoad</a>(<a class="code" href="classripple_1_1feeunit_1_1TaggedFee.html">FeeUnit64</a> fee, <a class="code" href="classripple_1_1LoadFeeTrack.html">LoadFeeTrack</a> <span class="keyword">const</span>&amp; feeTrack,</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <a class="code" href="structripple_1_1Fees.html">Fees</a> <span class="keyword">const</span>&amp; fees, <span class="keywordtype">bool</span> bUnlimited)</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;{</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; <span class="keywordflow">if</span> (fee == 0)</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classripple_1_1XRPAmount.html">XRPAmount</a>{0};</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; </div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="comment">// Normally, types with different units wouldn&#39;t be mathematically</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; <span class="comment">// compatible. This function is an exception.</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="keyword">auto</span> lowestTerms = [](<span class="keyword">auto</span>&amp; a, <span class="keyword">auto</span>&amp; b)</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; {</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="keyword">auto</span> value = [](<span class="keyword">auto</span> val)</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; {</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordflow">if</span> constexpr(<a class="codeRef" href="http://en.cppreference.com/w/cpp/types/is_arithmetic.html">std::is_arithmetic_v</a>&lt;decltype(val)&gt;)</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="keywordflow">return</span> val;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <span class="keywordflow">return</span> val.<a class="code" href="classripple_1_1XRPAmount.html#a28c84252418df3a45b0f8d1d814e9900">value</a>();</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; };</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; </div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; <span class="keywordflow">if</span> (<span class="keyword">auto</span> <span class="keyword">const</span> g = <a class="codeRef" href="http://en.cppreference.com/w/cpp/numeric/gcd.html">std::gcd</a>(value(a), value(b)))</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; {</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; a = value(a) / g;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; b = value(b) / g;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; }</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; };</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="comment">// Collect the fee rates</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; <span class="keyword">auto</span> [feeFactor, uRemFee] = feeTrack.<a class="code" href="classripple_1_1LoadFeeTrack.html#a3dc20f6bc95f0f1d59d7f2217bc5f0cd">getScalingFactors</a>();</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; <span class="comment">// Let privileged users pay the normal fee until</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; <span class="comment">// the local load exceeds four times the remote.</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; <span class="keywordflow">if</span> (bUnlimited &amp;&amp; (feeFactor &gt; uRemFee) &amp;&amp; (feeFactor &lt; (4 * uRemFee)))</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; feeFactor = uRemFee;</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; </div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; <a class="code" href="classripple_1_1XRPAmount.html">XRPAmount</a> baseFee{fees.<a class="code" href="structripple_1_1Fees.html#a64c9587f977c872e926a58401d7d8224">base</a>};</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; <span class="comment">// Compute:</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; <span class="comment">// fee = fee * baseFee * feeFactor / (fees.units * lftNormalFee);</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; <span class="comment">// without overflow, and as accurately as possible</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; </div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <span class="comment">// The denominator of the fraction we&#39;re trying to compute.</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; <span class="comment">// fees.units and lftNormalFee are both 32 bit,</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; <span class="comment">// so the multiplication can&#39;t overflow.</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; <span class="keyword">auto</span> den = <a class="code" href="classripple_1_1feeunit_1_1TaggedFee.html">FeeUnit64</a>{ fees.<a class="code" href="structripple_1_1Fees.html#a28da1f454fe1897cadd3813aaaad4eb7">units</a> }</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; * safe_cast&lt;std::uint64_t&gt;(feeTrack.<a class="code" href="classripple_1_1LoadFeeTrack.html#aba79fd95090f3faf3e4ab3e57e1739ce">getLoadBase</a>());</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; <span class="comment">// Reduce fee * baseFee * feeFactor / (fees.units * lftNormalFee)</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; <span class="comment">// to lowest terms.</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; lowestTerms(fee, den);</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; lowestTerms(baseFee, den);</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; lowestTerms(feeFactor, den);</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; </div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; <span class="comment">// fee and baseFee are 64 bit, feeFactor is 32 bit</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; <span class="comment">// Order fee and baseFee largest first</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; <span class="comment">// Normally, these types wouldn&#39;t be comparable or swappable.</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; <span class="comment">// This function is an exception.</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; <span class="keywordflow">if</span> (fee.<a class="code" href="classripple_1_1feeunit_1_1TaggedFee.html#a5471d03f8c687eb872f179e4bd345acf">value</a>() &lt; baseFee.value())</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160; {</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; <span class="keyword">auto</span> tmp = fee.<a class="code" href="classripple_1_1feeunit_1_1TaggedFee.html#a5471d03f8c687eb872f179e4bd345acf">value</a>();</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; fee = baseFee.<a class="code" href="classripple_1_1feeunit_1_1TaggedFee.html#a5471d03f8c687eb872f179e4bd345acf">value</a>();</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; baseFee = tmp;</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; }</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; <span class="comment">// double check</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; assert(fee.<a class="code" href="classripple_1_1feeunit_1_1TaggedFee.html#a5471d03f8c687eb872f179e4bd345acf">value</a>() &gt;= baseFee.value());</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; </div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; <span class="comment">// If baseFee * feeFactor overflows, the final result will overflow</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; <a class="code" href="classripple_1_1XRPAmount.html">XRPAmount</a> <span class="keyword">const</span> baseFeeOverflow{</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; <a class="codeRef" href="http://en.cppreference.com/w/cpp/types/numeric_limits/max.html">std::numeric_limits&lt;XRPAmount::value_type&gt;::max</a>() / feeFactor};</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; <span class="keywordflow">if</span> (baseFee &gt; baseFeeOverflow)</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160; {</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; Throw&lt;std::overflow_error&gt;(<span class="stringliteral">&quot;scaleFeeLoad&quot;</span>);</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; }</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160; baseFee *= feeFactor;</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160; </div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; <span class="keyword">auto</span> <span class="keyword">const</span> result = <a class="code" href="namespaceripple.html#a2b0f34def9a9d52a662228e4562fb7d4">mulDiv</a>(fee, baseFee, den);</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; <span class="keywordflow">if</span> (!result.first)</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; Throw&lt;std::overflow_error&gt; (<span class="stringliteral">&quot;scaleFeeLoad&quot;</span>);</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; <span class="keywordflow">return</span> result.second;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160;}</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; </div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160;} <span class="comment">// ripple</span></div>
</div><!-- fragment --></div><!-- contents -->
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a02e78475b96f9515007dd272b7f05421"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a02e78475b96f9515007dd272b7f05421">ripple::LoadFeeTrack::lftFeeMax</a></div><div class="ttdeci">static constexpr std::uint32_t lftFeeMax</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00130">LoadFeeTrack.h:130</a></div></div>
<div class="ttc" id="aclassripple_1_1XRPAmount_html_a28c84252418df3a45b0f8d1d814e9900"><div class="ttname"><a href="classripple_1_1XRPAmount.html#a28c84252418df3a45b0f8d1d814e9900">ripple::XRPAmount::value</a></div><div class="ttdeci">constexpr value_type value() const</div><div class="ttdoc">Returns the underlying value.</div><div class="ttdef"><b>Definition:</b> <a href="XRPAmount_8h_source.html#l00245">XRPAmount.h:245</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a05e1508b6d79d256e2200a8b7a5dbc09"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a05e1508b6d79d256e2200a8b7a5dbc09">ripple::LoadFeeTrack::lftFeeDecFraction</a></div><div class="ttdeci">static constexpr std::uint32_t lftFeeDecFraction</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00129">LoadFeeTrack.h:129</a></div></div>
<div class="ttc" id="anamespaceripple_html_a567b532d8246f4f0adde7d57c2ffa370"><div class="ttname"><a href="namespaceripple.html#a567b532d8246f4f0adde7d57c2ffa370">ripple::scaleFeeLoad</a></div><div class="ttdeci">XRPAmount scaleFeeLoad(FeeUnit64 fee, LoadFeeTrack const &amp;feeTrack, Fees const &amp;fees, bool bUnlimited)</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8cpp_source.html#l00089">LoadFeeTrack.cpp:89</a></div></div>
<div class="ttc" id="alock_guard_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard</a></div><div class="ttdoc">STL class.</div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_aba79fd95090f3faf3e4ab3e57e1739ce"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#aba79fd95090f3faf3e4ab3e57e1739ce">ripple::LoadFeeTrack::getLoadBase</a></div><div class="ttdeci">std::uint32_t getLoadBase() const</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00082">LoadFeeTrack.h:82</a></div></div>
<div class="ttc" id="ais_arithmetic_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/is_arithmetic.html">std::is_arithmetic_v</a></div><div class="ttdeci">T is_arithmetic_v</div></div>
<div class="ttc" id="astructripple_1_1Fees_html"><div class="ttname"><a href="structripple_1_1Fees.html">ripple::Fees</a></div><div class="ttdoc">Reflects the fee settings for a particular ledger.</div><div class="ttdef"><b>Definition:</b> <a href="ReadView_8h_source.html#l00047">ReadView.h:47</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a360c8a7d8793170c4f0207268edcac01"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a360c8a7d8793170c4f0207268edcac01">ripple::LoadFeeTrack::lock_</a></div><div class="ttdeci">std::mutex lock_</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00133">LoadFeeTrack.h:133</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a3dc20f6bc95f0f1d59d7f2217bc5f0cd"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a3dc20f6bc95f0f1d59d7f2217bc5f0cd">ripple::LoadFeeTrack::getScalingFactors</a></div><div class="ttdeci">std::pair&lt; std::uint32_t, std::uint32_t &gt; getScalingFactors() const</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00094">LoadFeeTrack.h:94</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a887986ce18f0bfddb0325f939c235cf0"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a887986ce18f0bfddb0325f939c235cf0">ripple::LoadFeeTrack::lftFeeIncFraction</a></div><div class="ttdeci">static constexpr std::uint32_t lftFeeIncFraction</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00128">LoadFeeTrack.h:128</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html">ripple::LoadFeeTrack</a></div><div class="ttdoc">Manages the current fee schedule.</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00043">LoadFeeTrack.h:43</a></div></div>
<div class="ttc" id="acstdint_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/cstdint.html">cstdint</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="agcd_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/numeric/gcd.html">std::gcd</a></div><div class="ttdeci">T gcd(T... args)</div></div>
<div class="ttc" id="aclassripple_1_1feeunit_1_1TaggedFee_html"><div class="ttname"><a href="classripple_1_1feeunit_1_1TaggedFee.html">ripple::feeunit::TaggedFee</a></div><div class="ttdef"><b>Definition:</b> <a href="FeeUnits_8h_source.html#l00072">FeeUnits.h:72</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a5b1924f5ce8d3be0956d549c57aede7a"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a5b1924f5ce8d3be0956d549c57aede7a">ripple::LoadFeeTrack::j_</a></div><div class="ttdeci">const beast::Journal j_</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00132">LoadFeeTrack.h:132</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a98e34e4167268fc92dc4b6a34bc22962"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a98e34e4167268fc92dc4b6a34bc22962">ripple::LoadFeeTrack::remoteTxnLoadFee_</a></div><div class="ttdeci">std::uint32_t remoteTxnLoadFee_</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00136">LoadFeeTrack.h:136</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="RCLCensorshipDetector_8h_source.html#l00029">RCLCensorshipDetector.h:29</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a219cf201607ad178eaca2c02b1efd928"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a219cf201607ad178eaca2c02b1efd928">ripple::LoadFeeTrack::raiseLocalFee</a></div><div class="ttdeci">bool raiseLocalFee()</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8cpp_source.html#l00037">LoadFeeTrack.cpp:37</a></div></div>
<div class="ttc" id="aclassripple_1_1feeunit_1_1TaggedFee_html_a5471d03f8c687eb872f179e4bd345acf"><div class="ttname"><a href="classripple_1_1feeunit_1_1TaggedFee.html#a5471d03f8c687eb872f179e4bd345acf">ripple::feeunit::TaggedFee::value</a></div><div class="ttdeci">constexpr value_type value() const</div><div class="ttdoc">Returns the underlying value.</div><div class="ttdef"><b>Definition:</b> <a href="FeeUnits_8h_source.html#l00333">FeeUnits.h:333</a></div></div>
<div class="ttc" id="astructripple_1_1Fees_html_a28da1f454fe1897cadd3813aaaad4eb7"><div class="ttname"><a href="structripple_1_1Fees.html#a28da1f454fe1897cadd3813aaaad4eb7">ripple::Fees::units</a></div><div class="ttdeci">FeeUnit32 units</div><div class="ttdef"><b>Definition:</b> <a href="ReadView_8h_source.html#l00050">ReadView.h:50</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#l00292">Journal.h:292</a></div></div>
<div class="ttc" id="anamespaceripple_html_a2b0f34def9a9d52a662228e4562fb7d4"><div class="ttname"><a href="namespaceripple.html#a2b0f34def9a9d52a662228e4562fb7d4">ripple::mulDiv</a></div><div class="ttdeci">std::pair&lt; bool, Dest &gt; mulDiv(Source1 value, Dest mul, Source2 div)</div><div class="ttdef"><b>Definition:</b> <a href="FeeUnits_8h_source.html#l00487">FeeUnits.h:487</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a66a12889d1d04e74629adcfa5c1b1c40"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a66a12889d1d04e74629adcfa5c1b1c40">ripple::LoadFeeTrack::raiseCount_</a></div><div class="ttdeci">std::uint32_t raiseCount_</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00138">LoadFeeTrack.h:138</a></div></div>
<div class="ttc" id="anumeric_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/numeric.html">numeric</a></div></div>
<div class="ttc" id="amax_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/numeric_limits/max.html">std::numeric_limits::max</a></div><div class="ttdeci">T max(T... args)</div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a79fc4e5d274dcd9308348f3e49145bc6"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a79fc4e5d274dcd9308348f3e49145bc6">ripple::LoadFeeTrack::lowerLocalFee</a></div><div class="ttdeci">bool lowerLocalFee()</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8cpp_source.html#l00065">LoadFeeTrack.cpp:65</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a50fac4a0863274aa1c6c2719d2a309bf"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a50fac4a0863274aa1c6c2719d2a309bf">ripple::LoadFeeTrack::lftNormalFee</a></div><div class="ttdeci">static constexpr std::uint32_t lftNormalFee</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00127">LoadFeeTrack.h:127</a></div></div>
<div class="ttc" id="atype_traits_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/type_traits.html">type_traits</a></div></div>
<div class="ttc" id="aclassripple_1_1LoadFeeTrack_html_a92b01d16612c188234cbcb35575c531b"><div class="ttname"><a href="classripple_1_1LoadFeeTrack.html#a92b01d16612c188234cbcb35575c531b">ripple::LoadFeeTrack::localTxnLoadFee_</a></div><div class="ttdeci">std::uint32_t localTxnLoadFee_</div><div class="ttdef"><b>Definition:</b> <a href="LoadFeeTrack_8h_source.html#l00135">LoadFeeTrack.h:135</a></div></div>
<div class="ttc" id="astructripple_1_1Fees_html_a64c9587f977c872e926a58401d7d8224"><div class="ttname"><a href="structripple_1_1Fees.html#a64c9587f977c872e926a58401d7d8224">ripple::Fees::base</a></div><div class="ttdeci">XRPAmount base</div><div class="ttdef"><b>Definition:</b> <a href="ReadView_8h_source.html#l00049">ReadView.h:49</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#l00046">XRPAmount.h:46</a></div></div>
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