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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Gamedev Framework (gf): Id.h Source File</title>
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<div id="projectname">Gamedev Framework (gf)<span id="projectnumber"> 0.21.0</span>
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<div id="projectbrief">A C++17 framework for 2D games</div>
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<div class="headertitle"><div class="title">Id.h</div></div>
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<div class="contents">
<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> * Gamedev Framework (gf)</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * Copyright (C) 2016-2021 Julien Bernard</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> *</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> * This software is provided 'as-is', without any express or implied</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> * warranty. In no event will the authors be held liable for any damages</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> * arising from the use of this software.</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"> * Permission is granted to anyone to use this software for any purpose,</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> * including commercial applications, and to alter it and redistribute it</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> * freely, subject to the following restrictions:</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> *</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> * 1. The origin of this software must not be misrepresented; you must not</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> * claim that you wrote the original software. If you use this software</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> * in a product, an acknowledgment in the product documentation would be</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"> * appreciated but is not required.</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment"> * 2. Altered source versions must be plainly marked as such, and must not be</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment"> * misrepresented as being the original software.</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment"> * 3. This notice may not be removed or altered from any source distribution.</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment"> */</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#ifndef GF_ID_H</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#define GF_ID_H</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include <cstdint></span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#include <string></span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="preprocessor">#include <string_view></span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacegf.html">gf</a> {</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="preprocessor">#ifndef DOXYGEN_SHOULD_SKIP_THIS</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="keyword">inline</span> <span class="keyword">namespace </span>v1 {</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"><a class="line" href="group__core__vocabulary.html#ga375ce9d7d861b67c78398d51c1769410"> 37</a></span> <span class="keyword">using</span> <a class="code hl_typedef" href="group__core__vocabulary.html#ga375ce9d7d861b67c78398d51c1769410">Id</a> = uint64_t;</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"><a class="line" href="group__core__vocabulary.html#ga63cc77139085fae86503ed552b1c52ee"> 43</a></span> <span class="keyword">constexpr</span> <a class="code hl_typedef" href="group__core__vocabulary.html#ga375ce9d7d861b67c78398d51c1769410">Id</a> <a class="code hl_variable" href="group__core__vocabulary.html#ga63cc77139085fae86503ed552b1c52ee">InvalidId</a> = 0;</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"><a class="line" href="group__core__vocabulary.html#gafb2a827226f08af1ff5ef7bfae6f525a"> 61</a></span> <span class="keyword">constexpr</span> <a class="code hl_typedef" href="group__core__vocabulary.html#ga375ce9d7d861b67c78398d51c1769410">Id</a> <a class="code hl_function" href="group__core__vocabulary.html#gafb2a827226f08af1ff5ef7bfae6f525a">hash</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *str, std::size_t sz) {</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <a class="code hl_typedef" href="group__core__vocabulary.html#ga375ce9d7d861b67c78398d51c1769410">Id</a> value = UINT64_C(0xcbf29ce484222325);</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> </div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="keywordflow">for</span> (std::size_t i = 0; i < sz; ++i) {</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> value ^= <span class="keyword">static_cast<</span><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span><span class="keyword">></span>(str[i]);</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> value *= UINT64_C(0x100000001b3);</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> }</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keywordflow">return</span> value;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> }</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> </div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"><a class="line" href="group__core__vocabulary.html#ga710eef48a8d7c6c4672157901d01c811"> 83</a></span> <span class="keyword">constexpr</span> <a class="code hl_typedef" href="group__core__vocabulary.html#ga375ce9d7d861b67c78398d51c1769410">Id</a> <a class="code hl_function" href="group__core__vocabulary.html#gafb2a827226f08af1ff5ef7bfae6f525a">hash</a>(std::string_view str) {</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="keywordflow">return</span> <a class="code hl_function" href="group__core__vocabulary.html#gafb2a827226f08af1ff5ef7bfae6f525a">hash</a>(str.data(), str.size());</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> }</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> </div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keyword">namespace </span>literals {</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> </div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"><a class="line" href="group__core__vocabulary.html#gabee0f27eabf569530e1d36025295de2f"> 102</a></span> <span class="keyword">constexpr</span> <a class="code hl_typedef" href="group__core__vocabulary.html#ga375ce9d7d861b67c78398d51c1769410">gf::Id</a> <span class="keyword">operator</span><span class="stringliteral">""</span> _id(<span class="keyword">const</span> <span class="keywordtype">char</span> *str, std::size_t sz) {</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> <span class="keywordflow">return</span> <a class="code hl_function" href="group__core__vocabulary.html#gafb2a827226f08af1ff5ef7bfae6f525a">gf::hash</a>(str, sz);</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> }</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> </div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> }</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span><span class="preprocessor">#ifndef DOXYGEN_SHOULD_SKIP_THIS</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span>}</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span>}</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> </div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span><span class="preprocessor">#endif </span><span class="comment">// GF_ID_H</span></div>
<div class="ttc" id="agroup__core__vocabulary_html_ga375ce9d7d861b67c78398d51c1769410"><div class="ttname"><a href="group__core__vocabulary.html#ga375ce9d7d861b67c78398d51c1769410">gf::Id</a></div><div class="ttdeci">uint64_t Id</div><div class="ttdoc">An identifier.</div><div class="ttdef"><b>Definition:</b> Id.h:37</div></div>
<div class="ttc" id="agroup__core__vocabulary_html_ga63cc77139085fae86503ed552b1c52ee"><div class="ttname"><a href="group__core__vocabulary.html#ga63cc77139085fae86503ed552b1c52ee">gf::InvalidId</a></div><div class="ttdeci">constexpr Id InvalidId</div><div class="ttdoc">The invalid id (which is 0)</div><div class="ttdef"><b>Definition:</b> Id.h:43</div></div>
<div class="ttc" id="agroup__core__vocabulary_html_gafb2a827226f08af1ff5ef7bfae6f525a"><div class="ttname"><a href="group__core__vocabulary.html#gafb2a827226f08af1ff5ef7bfae6f525a">gf::hash</a></div><div class="ttdeci">constexpr Id hash(const char *str, std::size_t sz)</div><div class="ttdoc">Get an identifier from a string.</div><div class="ttdef"><b>Definition:</b> Id.h:61</div></div>
<div class="ttc" id="anamespacegf_html"><div class="ttname"><a href="namespacegf.html">gf</a></div><div class="ttdoc">The namespace for gf classes.</div><div class="ttdef"><b>Definition:</b> Action.h:35</div></div>
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