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<li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.html">src</a></li><li class="navelem"><a class="el" href="dir_66e9674e8206a335795995fa32a03c91.html">entt</a></li><li class="navelem"><a class="el" href="dir_de8f4e6ba3f54a2a21309f742e93a373.html">core</a></li> </ul>
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<div class="title">hashed_string.hpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef ENTT_CORE_HASHED_STRING_HPP</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#define ENTT_CORE_HASHED_STRING_HPP</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> </div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include <cstdint></span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="keyword">namespace </span><a class="code" href="namespaceentt.html">entt</a> {</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00020"></a><span class="lineno"><a class="line" href="classentt_1_1HashedString.html"> 20</a></span> <span class="keyword">class </span><a class="code" href="classentt_1_1HashedString.html">HashedString</a> final {</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keyword">struct </span>ConstCharWrapper final {</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="comment">// non-explicit constructor on purpose</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  constexpr ConstCharWrapper(<span class="keyword">const</span> <span class="keywordtype">char</span> *str) noexcept: str{str} {}</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *str;</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  };</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keyword">static</span> constexpr std::uint64_t offset = 14695981039346656037ull;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keyword">static</span> constexpr std::uint64_t prime = 1099511628211ull;</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="comment">// Fowler–Noll–Vo hash function v. 1a - the good</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keyword">static</span> constexpr std::uint64_t helper(std::uint64_t partial, <span class="keyword">const</span> <span class="keywordtype">char</span> *str) noexcept {</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">return</span> str[0] == 0 ? partial : helper((partial^str[0])*prime, str+1);</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  }</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classentt_1_1HashedString.html#af511100177b5e0213bf5b0efb3f4f528"> 37</a></span>  <span class="keyword">using</span> <a class="code" href="classentt_1_1HashedString.html#af511100177b5e0213bf5b0efb3f4f528">hash_type</a> = std::uint64_t;</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">template</span> <std::<span class="keywordtype">size_t</span> N></div><div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="classentt_1_1HashedString.html#ad673b1485f96c7139715aed744e1008d"> 54</a></span>  constexpr <a class="code" href="classentt_1_1HashedString.html#ad673b1485f96c7139715aed744e1008d">HashedString</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> (&str)[N]) noexcept</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  : hash{helper(offset, str)}, str{str}</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  {}</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div><div class="line"><a name="l00064"></a><span class="lineno"><a class="line" href="classentt_1_1HashedString.html#ab529065abd11f7593dd37ccfba49003d"> 64</a></span>  <span class="keyword">explicit</span> constexpr <a class="code" href="classentt_1_1HashedString.html#ab529065abd11f7593dd37ccfba49003d">HashedString</a>(ConstCharWrapper wrapper) noexcept</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  : hash{helper(offset, wrapper.str)}, str{wrapper.str}</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  {}</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div><div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="classentt_1_1HashedString.html#a3aacde6c4fea95305893de7b08adf22e"> 72</a></span>  constexpr <span class="keyword">operator</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *() <span class="keyword">const</span> noexcept { <span class="keywordflow">return</span> str; }</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div><div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="classentt_1_1HashedString.html#aa8088952ceeb8220b9b493f627995f50"> 78</a></span>  constexpr <span class="keyword">operator</span> <a class="code" href="classentt_1_1HashedString.html#af511100177b5e0213bf5b0efb3f4f528">hash_type</a>() const noexcept { <span class="keywordflow">return</span> hash; }</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div><div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="classentt_1_1HashedString.html#a1a79c5ae19081abc09d5c4052a5b5ea0"> 85</a></span>  constexpr <span class="keywordtype">bool</span> <a class="code" href="classentt_1_1HashedString.html#a1a79c5ae19081abc09d5c4052a5b5ea0">operator==</a>(<span class="keyword">const</span> <a class="code" href="classentt_1_1HashedString.html">HashedString</a> &other) <span class="keyword">const</span> noexcept {</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">return</span> hash == other.hash;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  }</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> </div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="keyword">private</span>:</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">const</span> <a class="code" href="classentt_1_1HashedString.html#af511100177b5e0213bf5b0efb3f4f528">hash_type</a> hash;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *str;</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> };</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div><div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="namespaceentt.html#a18e1a7cdfcb0c0ba075e0beeda95285f"> 101</a></span> constexpr <span class="keywordtype">bool</span> <a class="code" href="namespaceentt.html#a18e1a7cdfcb0c0ba075e0beeda95285f">operator!=</a>(<span class="keyword">const</span> <a class="code" href="classentt_1_1HashedString.html">HashedString</a> &lhs, <span class="keyword">const</span> <a class="code" href="classentt_1_1HashedString.html">HashedString</a> &rhs) noexcept {</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> !(lhs == rhs);</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> }</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> </div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> }</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="preprocessor">#endif // ENTT_CORE_HASHED_STRING_HPP</span></div><div class="ttc" id="classentt_1_1HashedString_html_ab529065abd11f7593dd37ccfba49003d"><div class="ttname"><a href="classentt_1_1HashedString.html#ab529065abd11f7593dd37ccfba49003d">entt::HashedString::HashedString</a></div><div class="ttdeci">constexpr HashedString(ConstCharWrapper wrapper) noexcept</div><div class="ttdoc">Explicit constructor on purpose to avoid constructing a hashed string directly from a const char *...</div><div class="ttdef"><b>Definition:</b> <a href="hashed__string_8hpp_source.html#l00064">hashed_string.hpp:64</a></div></div>
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<div class="ttc" id="namespaceentt_html"><div class="ttname"><a href="namespaceentt.html">entt</a></div><div class="ttdoc">EnTT default namespace. </div><div class="ttdef"><b>Definition:</b> <a href="family_8hpp_source.html#l00009">family.hpp:9</a></div></div>
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<div class="ttc" id="classentt_1_1HashedString_html"><div class="ttname"><a href="classentt_1_1HashedString.html">entt::HashedString</a></div><div class="ttdoc">Zero overhead resource identifier. </div><div class="ttdef"><b>Definition:</b> <a href="hashed__string_8hpp_source.html#l00020">hashed_string.hpp:20</a></div></div>
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<div class="ttc" id="classentt_1_1HashedString_html_ad673b1485f96c7139715aed744e1008d"><div class="ttname"><a href="classentt_1_1HashedString.html#ad673b1485f96c7139715aed744e1008d">entt::HashedString::HashedString</a></div><div class="ttdeci">constexpr HashedString(const char(&str)[N]) noexcept</div><div class="ttdoc">Constructs a hashed string from an array of const chars. </div><div class="ttdef"><b>Definition:</b> <a href="hashed__string_8hpp_source.html#l00054">hashed_string.hpp:54</a></div></div>
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<div class="ttc" id="classentt_1_1HashedString_html_af511100177b5e0213bf5b0efb3f4f528"><div class="ttname"><a href="classentt_1_1HashedString.html#af511100177b5e0213bf5b0efb3f4f528">entt::HashedString::hash_type</a></div><div class="ttdeci">std::uint64_t hash_type</div><div class="ttdoc">Unsigned integer type. </div><div class="ttdef"><b>Definition:</b> <a href="hashed__string_8hpp_source.html#l00037">hashed_string.hpp:37</a></div></div>
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<div class="ttc" id="namespaceentt_html_a18e1a7cdfcb0c0ba075e0beeda95285f"><div class="ttname"><a href="namespaceentt.html#a18e1a7cdfcb0c0ba075e0beeda95285f">entt::operator!=</a></div><div class="ttdeci">constexpr bool operator!=(const HashedString &lhs, const HashedString &rhs) noexcept</div><div class="ttdoc">Compares two hashed strings. </div><div class="ttdef"><b>Definition:</b> <a href="hashed__string_8hpp_source.html#l00101">hashed_string.hpp:101</a></div></div>
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<div class="ttc" id="classentt_1_1HashedString_html_a1a79c5ae19081abc09d5c4052a5b5ea0"><div class="ttname"><a href="classentt_1_1HashedString.html#a1a79c5ae19081abc09d5c4052a5b5ea0">entt::HashedString::operator==</a></div><div class="ttdeci">constexpr bool operator==(const HashedString &other) const noexcept</div><div class="ttdoc">Compares two hashed strings. </div><div class="ttdef"><b>Definition:</b> <a href="hashed__string_8hpp_source.html#l00085">hashed_string.hpp:85</a></div></div>
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