277 lines
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277 lines
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<div id="projectname">fourdst::libcomposition<span id="projectnumber"> v2.4.9</span>
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<div id="projectbrief">Robust atomic species information library</div>
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<div class="headertitle"><div class="title">composition_hash.h</div></div>
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<a href="composition__hash_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="preprocessor">#pragma once</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span> </div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="preprocessor">#include <cstring></span></div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="preprocessor">#include <vector></span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#include <bit></span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include "xxhash64.h"</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include "<a class="code" href="composition_8h.html">fourdst/composition/composition.h</a>"</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include "<a class="code" href="composition__abstract_8h.html">fourdst/composition/composition_abstract.h</a>"</span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span> </div>
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<div class="foldopen" id="foldopen00011" data-start="{" data-end="}">
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"><a class="line" href="namespacefourdst_1_1composition_1_1utils.html"> 11</a></span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacefourdst_1_1composition_1_1utils.html">fourdst::composition::utils</a> {</div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// Make a concept which checks if a type inherits from CompositionAbstract</span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">template</span> <<span class="keyword">typename</span> CompT></div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"><a class="line" href="conceptfourdst_1_1composition_1_1utils_1_1_composition_type.html"> 14</a></span> <span class="keyword">concept </span><a class="code hl_concept" href="conceptfourdst_1_1composition_1_1utils_1_1_composition_type.html">CompositionType</a> = std::is_base_of_v<CompositionAbstract, CompT>;</div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> </div>
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<div class="foldopen" id="foldopen00016" data-start="{" data-end="};">
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"><a class="line" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html"> 16</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html">CompositionHash</a> {</div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">template</span> <CompositionType CompositionT></div>
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<div class="foldopen" id="foldopen00018" data-start="{" data-end="}">
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"><a class="line" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#af30bb4f60999d9ad99ad3893efa2de65"> 18</a></span> <span class="keyword">static</span> uint64_t <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#af30bb4f60999d9ad99ad3893efa2de65">hash_exact</a>(<span class="keyword">const</span> CompositionT& comp) {</div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> uint64_t h0 = <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ac80f1cb0966ae3d0358e77c7a6f904f5">kSeed</a>;</div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> uint64_t h1 = <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ac80f1cb0966ae3d0358e77c7a6f904f5">kSeed</a> ^ <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a534655db7f5270577d2ebd99f7afb233">kPrime1</a>;</div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> uint64_t h2 = <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ac80f1cb0966ae3d0358e77c7a6f904f5">kSeed</a> ^ <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a3ec846d75e05a3f9d852e479bbdeffc0">kPrime2</a>;</div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> uint64_t h3 = <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ac80f1cb0966ae3d0358e77c7a6f904f5">kSeed</a> ^ <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#aaada3987c54d6a960843d28ecac48b12">kPrime3</a>;</div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> </div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">auto</span> it = comp.begin();</div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> <span class="keywordtype">size_t</span> remaining = comp.size();</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> </div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="keywordflow">while</span> (remaining >= 4) {</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <span class="keyword">const</span> <span class="keyword">auto</span>& p0 = *it;</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> ++it;</div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> h0 ^= <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a84329d89ee262cfc08e358033b4ae6c3">pack_species_id</a>(p0.first);</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> h0 = <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h0, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a534655db7f5270577d2ebd99f7afb233">kPrime1</a>);</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> h0 ^= <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a492812c018520c057c0a113c9113f9d2">normalize_double_bits</a>(p0.second);</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> h0 = <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h0, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a3ec846d75e05a3f9d852e479bbdeffc0">kPrime2</a>);</div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> </div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">const</span> <span class="keyword">auto</span>& p1 = *it;</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> ++it;</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> h1 ^= <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a84329d89ee262cfc08e358033b4ae6c3">pack_species_id</a>(p1.first);</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> h1 = <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h1, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a534655db7f5270577d2ebd99f7afb233">kPrime1</a>);</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> h1 ^= <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a492812c018520c057c0a113c9113f9d2">normalize_double_bits</a>(p1.second);</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> h1 = <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h1, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a3ec846d75e05a3f9d852e479bbdeffc0">kPrime2</a>);</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> </div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keyword">const</span> <span class="keyword">auto</span>& p2 = *it;</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> ++it;</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> h2 ^= <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a84329d89ee262cfc08e358033b4ae6c3">pack_species_id</a>(p2.first);</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> h2 = <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h2, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a534655db7f5270577d2ebd99f7afb233">kPrime1</a>);</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> h2 ^= <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a492812c018520c057c0a113c9113f9d2">normalize_double_bits</a>(p2.second);</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> h2 = <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h2, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a3ec846d75e05a3f9d852e479bbdeffc0">kPrime2</a>);</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> </div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">const</span> <span class="keyword">auto</span>& p3 = *it;</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> ++it;</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> h3 ^= <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a84329d89ee262cfc08e358033b4ae6c3">pack_species_id</a>(p3.first);</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> h3 = <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h3, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a534655db7f5270577d2ebd99f7afb233">kPrime1</a>);</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> h3 ^= <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a492812c018520c057c0a113c9113f9d2">normalize_double_bits</a>(p3.second);</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> h3 = <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h3, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a3ec846d75e05a3f9d852e479bbdeffc0">kPrime2</a>);</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> remaining -= 4;</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> }</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> </div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keywordflow">while</span> (remaining > 0) {</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keyword">const</span> <span class="keyword">auto</span>& p = *it;</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> ++it;</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> h0 ^= <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a84329d89ee262cfc08e358033b4ae6c3">pack_species_id</a>(p.first);</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> h0 = <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h0, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a534655db7f5270577d2ebd99f7afb233">kPrime1</a>);</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> h0 ^= <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a492812c018520c057c0a113c9113f9d2">normalize_double_bits</a>(p.second);</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> h0 = <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h0, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a3ec846d75e05a3f9d852e479bbdeffc0">kPrime2</a>);</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> --remaining;</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> }</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> </div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keywordflow">return</span> <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h0 ^ h1 ^ h2 ^ h3, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#aaada3987c54d6a960843d28ecac48b12">kPrime3</a>);</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> }</div>
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</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> </div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keyword">private</span>:</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"><a class="line" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ac80f1cb0966ae3d0358e77c7a6f904f5"> 73</a></span> <span class="keyword">static</span> <span class="keyword">constexpr</span> uint64_t <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ac80f1cb0966ae3d0358e77c7a6f904f5">kSeed</a> = 0xC04D5EEDBEEFull;</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"><a class="line" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a534655db7f5270577d2ebd99f7afb233"> 74</a></span> <span class="keyword">static</span> <span class="keyword">constexpr</span> uint64_t <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a534655db7f5270577d2ebd99f7afb233">kPrime1</a> = 0xa0761d6478bd642fULL;</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"><a class="line" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a3ec846d75e05a3f9d852e479bbdeffc0"> 75</a></span> <span class="keyword">static</span> <span class="keyword">constexpr</span> uint64_t <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a3ec846d75e05a3f9d852e479bbdeffc0">kPrime2</a> = 0xe7037ed1a0b428dbULL;</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"><a class="line" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#aaada3987c54d6a960843d28ecac48b12"> 76</a></span> <span class="keyword">static</span> <span class="keyword">constexpr</span> uint64_t <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#aaada3987c54d6a960843d28ecac48b12">kPrime3</a> = 0x8ebc6af09c88c6e3ULL;</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> </div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="comment">// --- Helper: Fast integer mixing ---</span></div>
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<div class="foldopen" id="foldopen00079" data-start="{" data-end="}">
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"><a class="line" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076"> 79</a></span> <span class="keyword">static</span> <span class="keyword">inline</span> uint64_t <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(<span class="keyword">const</span> uint64_t a, <span class="keyword">const</span> uint64_t b) <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> __int128 r = <span class="keyword">static_cast<</span><span class="keywordtype">unsigned</span> __int128<span class="keyword">></span>(a) * <span class="keyword">static_cast<</span><span class="keywordtype">unsigned</span> __int128<span class="keyword">></span>(b);</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>uint64_t<span class="keyword">></span>(r) ^ <span class="keyword">static_cast<</span>uint64_t<span class="keyword">></span>(r >> 64);</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> }</div>
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</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> </div>
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<div class="foldopen" id="foldopen00084" data-start="{" data-end="}">
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"><a class="line" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a8f6f7432f29b9da29d09efccd11373fa"> 84</a></span> <span class="keyword">static</span> <span class="keyword">inline</span> uint64_t <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a8f6f7432f29b9da29d09efccd11373fa">mix</a>(<span class="keyword">const</span> uint64_t h) <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="keywordflow">return</span> <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">mum</a>(h, <a class="code hl_variable" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a534655db7f5270577d2ebd99f7afb233">kPrime1</a>);</div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> }</div>
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</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> </div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// --- Normalization Logic ---</span></div>
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<div class="foldopen" id="foldopen00089" data-start="{" data-end="}">
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"><a class="line" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a492812c018520c057c0a113c9113f9d2"> 89</a></span> <span class="keyword">static</span> <span class="keyword">inline</span> uint64_t <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a492812c018520c057c0a113c9113f9d2">normalize_double_bits</a>(<span class="keywordtype">double</span> v) <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="keywordflow">if</span> (v == 0.0) v = 0.0; <span class="comment">// fold -0.0 -> +0.0</span></div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="keywordflow">if</span> (std::isnan(v)) {</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> <span class="keywordflow">return</span> 0x7ff8000000000000ULL; <span class="comment">// canonical quiet NaN</span></div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> }</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <span class="keywordflow">return</span> std::bit_cast<uint64_t>(v);</div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> }</div>
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</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> </div>
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<div class="foldopen" id="foldopen00097" data-start="{" data-end="}">
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"><a class="line" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a84329d89ee262cfc08e358033b4ae6c3"> 97</a></span> <span class="keyword">static</span> <span class="keyword">inline</span> uint32_t <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a84329d89ee262cfc08e358033b4ae6c3">pack_species_id</a>(<span class="keyword">const</span> <span class="keyword">auto</span>& s) <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> <span class="keyword">const</span> <span class="keyword">auto</span> z = <span class="keyword">static_cast<</span>uint16_t<span class="keyword">></span>(s.z());</div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <span class="keyword">const</span> <span class="keyword">auto</span> a = <span class="keyword">static_cast<</span>uint16_t<span class="keyword">></span>(s.a());</div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <span class="keywordflow">return</span> (<span class="keyword">static_cast<</span>uint32_t<span class="keyword">></span>(z) << 16) | <span class="keyword">static_cast<</span>uint32_t<span class="keyword">></span>(a);</div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> }</div>
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</div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> };</div>
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</div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span>}</div>
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</div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> </div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span><span class="keyword">template</span><></div>
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<div class="foldopen" id="foldopen00106" data-start="{" data-end="};">
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"><a class="line" href="structstd_1_1hash_3_01fourdst_1_1composition_1_1_composition_abstract_01_4.html"> 106</a></span><span class="keyword">struct </span>std::hash<<a class="code hl_namespace" href="namespacefourdst.html">fourdst</a>::composition::CompositionAbstract> {</div>
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<div class="foldopen" id="foldopen00107" data-start="{" data-end="}">
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"><a class="line" href="structstd_1_1hash_3_01fourdst_1_1composition_1_1_composition_abstract_01_4.html#a1d1f55cfb8f4605a477e368bb2f8d860"> 107</a></span> std::size_t <a class="code hl_function" href="structstd_1_1hash_3_01fourdst_1_1composition_1_1_composition_abstract_01_4.html#a1d1f55cfb8f4605a477e368bb2f8d860">operator()</a>(<span class="keyword">const</span> <a class="code hl_class" href="classfourdst_1_1composition_1_1_composition_abstract.html">fourdst::composition::CompositionAbstract</a>& c) <span class="keyword">const</span> <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>std::size_t<span class="keyword">></span>(</div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#af30bb4f60999d9ad99ad3893efa2de65">fourdst::composition::utils::CompositionHash::hash_exact</a>(c)</div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> );</div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> }</div>
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</div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span>};</div>
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</div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span><span class="keyword">template</span><></div>
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<div class="foldopen" id="foldopen00114" data-start="{" data-end="};">
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"><a class="line" href="structstd_1_1hash_3_01fourdst_1_1composition_1_1_composition_01_4.html"> 114</a></span><span class="keyword">struct </span>std::hash<<a class="code hl_namespace" href="namespacefourdst.html">fourdst</a>::composition::Composition> {</div>
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<div class="foldopen" id="foldopen00115" data-start="{" data-end="}">
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<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"><a class="line" href="structstd_1_1hash_3_01fourdst_1_1composition_1_1_composition_01_4.html#a20ef7280a7d2353f5b391a1a00263d0c"> 115</a></span> std::size_t <a class="code hl_function" href="structstd_1_1hash_3_01fourdst_1_1composition_1_1_composition_01_4.html#a20ef7280a7d2353f5b391a1a00263d0c">operator()</a>(<span class="keyword">const</span> <a class="code hl_class" href="classfourdst_1_1composition_1_1_composition.html">fourdst::composition::Composition</a>& c) <span class="keyword">const</span> <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>std::size_t<span class="keyword">></span>(</div>
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<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <a class="code hl_function" href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#af30bb4f60999d9ad99ad3893efa2de65">fourdst::composition::utils::CompositionHash::hash_exact</a>(c)</div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> );</div>
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> }</div>
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</div>
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<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span>};</div>
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</div>
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<div class="ttc" id="aclassfourdst_1_1composition_1_1_composition_abstract_html"><div class="ttname"><a href="classfourdst_1_1composition_1_1_composition_abstract.html">fourdst::composition::CompositionAbstract</a></div><div class="ttdoc">Abstract base class for chemical composition representations.</div><div class="ttdef"><b>Definition</b> <a href="composition__abstract_8h_source.html#l00036">composition_abstract.h:36</a></div></div>
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<div class="ttc" id="aclassfourdst_1_1composition_1_1_composition_html"><div class="ttname"><a href="classfourdst_1_1composition_1_1_composition.html">fourdst::composition::Composition</a></div><div class="ttdoc">Manages a collection of chemical species and their abundances.</div><div class="ttdef"><b>Definition</b> <a href="composition_8h_source.html#l00099">composition.h:99</a></div></div>
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<div class="ttc" id="acomposition_8h_html"><div class="ttname"><a href="composition_8h.html">composition.h</a></div></div>
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<div class="ttc" id="acomposition__abstract_8h_html"><div class="ttname"><a href="composition__abstract_8h.html">composition_abstract.h</a></div></div>
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<div class="ttc" id="aconceptfourdst_1_1composition_1_1utils_1_1_composition_type_html"><div class="ttname"><a href="conceptfourdst_1_1composition_1_1utils_1_1_composition_type.html">fourdst::composition::utils::CompositionType</a></div><div class="ttdef"><b>Definition</b> <a href="#l00014">composition_hash.h:14</a></div></div>
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<div class="ttc" id="anamespacefourdst_1_1composition_1_1utils_html"><div class="ttname"><a href="namespacefourdst_1_1composition_1_1utils.html">fourdst::composition::utils</a></div><div class="ttdef"><b>Definition</b> <a href="#l00011">composition_hash.h:11</a></div></div>
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<div class="ttc" id="anamespacefourdst_html"><div class="ttname"><a href="namespacefourdst.html">fourdst</a></div></div>
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<div class="ttc" id="astructfourdst_1_1composition_1_1utils_1_1_composition_hash_html"><div class="ttname"><a href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html">fourdst::composition::utils::CompositionHash</a></div><div class="ttdef"><b>Definition</b> <a href="#l00016">composition_hash.h:16</a></div></div>
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<div class="ttc" id="astructfourdst_1_1composition_1_1utils_1_1_composition_hash_html_a3ec846d75e05a3f9d852e479bbdeffc0"><div class="ttname"><a href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a3ec846d75e05a3f9d852e479bbdeffc0">fourdst::composition::utils::CompositionHash::kPrime2</a></div><div class="ttdeci">static constexpr uint64_t kPrime2</div><div class="ttdef"><b>Definition</b> <a href="#l00075">composition_hash.h:75</a></div></div>
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<div class="ttc" id="astructfourdst_1_1composition_1_1utils_1_1_composition_hash_html_a492812c018520c057c0a113c9113f9d2"><div class="ttname"><a href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a492812c018520c057c0a113c9113f9d2">fourdst::composition::utils::CompositionHash::normalize_double_bits</a></div><div class="ttdeci">static uint64_t normalize_double_bits(double v) noexcept</div><div class="ttdef"><b>Definition</b> <a href="#l00089">composition_hash.h:89</a></div></div>
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<div class="ttc" id="astructfourdst_1_1composition_1_1utils_1_1_composition_hash_html_a534655db7f5270577d2ebd99f7afb233"><div class="ttname"><a href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a534655db7f5270577d2ebd99f7afb233">fourdst::composition::utils::CompositionHash::kPrime1</a></div><div class="ttdeci">static constexpr uint64_t kPrime1</div><div class="ttdef"><b>Definition</b> <a href="#l00074">composition_hash.h:74</a></div></div>
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<div class="ttc" id="astructfourdst_1_1composition_1_1utils_1_1_composition_hash_html_a84329d89ee262cfc08e358033b4ae6c3"><div class="ttname"><a href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a84329d89ee262cfc08e358033b4ae6c3">fourdst::composition::utils::CompositionHash::pack_species_id</a></div><div class="ttdeci">static uint32_t pack_species_id(const auto &s) noexcept</div><div class="ttdef"><b>Definition</b> <a href="#l00097">composition_hash.h:97</a></div></div>
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<div class="ttc" id="astructfourdst_1_1composition_1_1utils_1_1_composition_hash_html_a8f6f7432f29b9da29d09efccd11373fa"><div class="ttname"><a href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#a8f6f7432f29b9da29d09efccd11373fa">fourdst::composition::utils::CompositionHash::mix</a></div><div class="ttdeci">static uint64_t mix(const uint64_t h) noexcept</div><div class="ttdef"><b>Definition</b> <a href="#l00084">composition_hash.h:84</a></div></div>
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<div class="ttc" id="astructfourdst_1_1composition_1_1utils_1_1_composition_hash_html_aaada3987c54d6a960843d28ecac48b12"><div class="ttname"><a href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#aaada3987c54d6a960843d28ecac48b12">fourdst::composition::utils::CompositionHash::kPrime3</a></div><div class="ttdeci">static constexpr uint64_t kPrime3</div><div class="ttdef"><b>Definition</b> <a href="#l00076">composition_hash.h:76</a></div></div>
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<div class="ttc" id="astructfourdst_1_1composition_1_1utils_1_1_composition_hash_html_ac80f1cb0966ae3d0358e77c7a6f904f5"><div class="ttname"><a href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ac80f1cb0966ae3d0358e77c7a6f904f5">fourdst::composition::utils::CompositionHash::kSeed</a></div><div class="ttdeci">static constexpr uint64_t kSeed</div><div class="ttdef"><b>Definition</b> <a href="#l00073">composition_hash.h:73</a></div></div>
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<div class="ttc" id="astructfourdst_1_1composition_1_1utils_1_1_composition_hash_html_ae4645b210880b3d76e205783fa9a3076"><div class="ttname"><a href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#ae4645b210880b3d76e205783fa9a3076">fourdst::composition::utils::CompositionHash::mum</a></div><div class="ttdeci">static uint64_t mum(const uint64_t a, const uint64_t b) noexcept</div><div class="ttdef"><b>Definition</b> <a href="#l00079">composition_hash.h:79</a></div></div>
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<div class="ttc" id="astructfourdst_1_1composition_1_1utils_1_1_composition_hash_html_af30bb4f60999d9ad99ad3893efa2de65"><div class="ttname"><a href="structfourdst_1_1composition_1_1utils_1_1_composition_hash.html#af30bb4f60999d9ad99ad3893efa2de65">fourdst::composition::utils::CompositionHash::hash_exact</a></div><div class="ttdeci">static uint64_t hash_exact(const CompositionT &comp)</div><div class="ttdef"><b>Definition</b> <a href="#l00018">composition_hash.h:18</a></div></div>
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<div class="ttc" id="astructstd_1_1hash_3_01fourdst_1_1composition_1_1_composition_01_4_html_a20ef7280a7d2353f5b391a1a00263d0c"><div class="ttname"><a href="structstd_1_1hash_3_01fourdst_1_1composition_1_1_composition_01_4.html#a20ef7280a7d2353f5b391a1a00263d0c">std::hash< fourdst::composition::Composition >::operator()</a></div><div class="ttdeci">std::size_t operator()(const fourdst::composition::Composition &c) const noexcept</div><div class="ttdef"><b>Definition</b> <a href="#l00115">composition_hash.h:115</a></div></div>
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<div class="ttc" id="astructstd_1_1hash_3_01fourdst_1_1composition_1_1_composition_abstract_01_4_html_a1d1f55cfb8f4605a477e368bb2f8d860"><div class="ttname"><a href="structstd_1_1hash_3_01fourdst_1_1composition_1_1_composition_abstract_01_4.html#a1d1f55cfb8f4605a477e368bb2f8d860">std::hash< fourdst::composition::CompositionAbstract >::operator()</a></div><div class="ttdeci">std::size_t operator()(const fourdst::composition::CompositionAbstract &c) const noexcept</div><div class="ttdef"><b>Definition</b> <a href="#l00107">composition_hash.h:107</a></div></div>
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