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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">memory.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_MEMORY_HPP</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#define ENTT_CORE_MEMORY_HPP</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>  </div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include <cstddef></span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include <limits></span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include <memory></span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include <tuple></span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include <type_traits></span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <utility></span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "../config/config.h"</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="keyword">namespace </span><a class="code" href="namespaceentt.html">entt</a> {</div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">template</span><<span class="keyword">typename</span> Type></div>
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<div class="line"><a name="l00021"></a><span class="lineno"><a class="line" href="namespaceentt.html#a94ed50d1975e6adee73101eb05c88d73"> 21</a></span> [[nodiscard]] constexpr <span class="keyword">auto</span> <a class="code" href="namespaceentt.html#a94ed50d1975e6adee73101eb05c88d73">to_address</a>(Type &&ptr) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">if</span> constexpr(std::is_pointer_v<std::remove_cv_t<std::remove_reference_t<Type>>>) {</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">return</span> ptr;</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keywordflow">return</span> <a class="code" href="namespaceentt.html#a94ed50d1975e6adee73101eb05c88d73">to_address</a>(std::forward<Type>(ptr).operator->());</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  }</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> }</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">template</span><<span class="keyword">typename</span> Allocator></div>
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<div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="namespaceentt.html#a9eb49df8bf1b69e836039b76e5b9938e"> 36</a></span> constexpr <span class="keywordtype">void</span> <a class="code" href="namespaceentt.html#a9eb49df8bf1b69e836039b76e5b9938e">propagate_on_container_copy_assignment</a>([[maybe_unused]] Allocator &lhs, [[maybe_unused]] Allocator &rhs) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">if</span> constexpr(std::allocator_traits<Allocator>::propagate_on_container_copy_assignment::value) {</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  lhs = rhs;</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  }</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> }</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  </div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="keyword">template</span><<span class="keyword">typename</span> Allocator></div>
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<div class="line"><a name="l00049"></a><span class="lineno"><a class="line" href="namespaceentt.html#a122ae54373a080574c45c77319cec7f7"> 49</a></span> constexpr <span class="keywordtype">void</span> <a class="code" href="namespaceentt.html#a122ae54373a080574c45c77319cec7f7">propagate_on_container_move_assignment</a>([[maybe_unused]] Allocator &lhs, [[maybe_unused]] Allocator &rhs) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">if</span> constexpr(std::allocator_traits<Allocator>::propagate_on_container_move_assignment::value) {</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  lhs = std::move(rhs);</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  }</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> }</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="keyword">template</span><<span class="keyword">typename</span> Allocator></div>
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<div class="line"><a name="l00062"></a><span class="lineno"><a class="line" href="namespaceentt.html#a1359cd624e6726f884df34df66656855"> 62</a></span> constexpr <span class="keywordtype">void</span> <a class="code" href="namespaceentt.html#a1359cd624e6726f884df34df66656855">propagate_on_container_swap</a>([[maybe_unused]] Allocator &lhs, [[maybe_unused]] Allocator &rhs) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  ENTT_ASSERT(std::allocator_traits<Allocator>::propagate_on_container_swap::value || lhs == rhs, <span class="stringliteral">"Cannot swap the containers"</span>);</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">if</span> constexpr(std::allocator_traits<Allocator>::propagate_on_container_swap::value) {</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">using</span> std::swap;</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <a class="code" href="namespaceentt.html#aef08fc4202f32f712bde26f55db463cb">swap</a>(lhs, rhs);</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  }</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> }</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  </div>
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<div class="line"><a name="l00076"></a><span class="lineno"><a class="line" href="namespaceentt.html#a3755517604de1d9d3f3e0a5549c750c5"> 76</a></span> [[nodiscard]] <span class="keyword">inline</span> constexpr <span class="keywordtype">bool</span> <a class="code" href="namespaceentt.html#a3755517604de1d9d3f3e0a5549c750c5">is_power_of_two</a>(<span class="keyword">const</span> std::size_t value) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">return</span> value && ((value & (value - 1)) == 0);</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> }</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  </div>
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<div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="namespaceentt.html#a5a2dbf5d86123af800abdd8fe69542ca"> 85</a></span> [[nodiscard]] <span class="keyword">inline</span> constexpr std::size_t <a class="code" href="namespaceentt.html#a5a2dbf5d86123af800abdd8fe69542ca">next_power_of_two</a>(<span class="keyword">const</span> std::size_t value) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  ENTT_ASSERT(value < (std::size_t{1u} << (std::numeric_limits<std::size_t>::digits - 1)), <span class="stringliteral">"Numeric limits exceeded"</span>);</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  std::size_t curr = value - (value != 0u);</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  </div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> next = 1; next < std::numeric_limits<std::size_t>::digits; next = next * 2) {</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  curr |= curr >> next;</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  </div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">return</span> ++curr;</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> }</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  </div>
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<div class="line"><a name="l00102"></a><span class="lineno"><a class="line" href="namespaceentt.html#a28fe7952c2a11ebc2b47d95fb749adda"> 102</a></span> [[nodiscard]] <span class="keyword">inline</span> constexpr std::size_t <a class="code" href="namespaceentt.html#a28fe7952c2a11ebc2b47d95fb749adda">fast_mod</a>(<span class="keyword">const</span> std::size_t value, <span class="keyword">const</span> std::size_t mod) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  ENTT_ASSERT(<a class="code" href="namespaceentt.html#a3755517604de1d9d3f3e0a5549c750c5">is_power_of_two</a>(mod), <span class="stringliteral">"Value must be a power of two"</span>);</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">return</span> value & (mod - 1u);</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> }</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  </div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="keyword">template</span><<span class="keyword">typename</span> Allocator></div>
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<div class="line"><a name="l00112"></a><span class="lineno"><a class="line" href="structentt_1_1allocation__deleter.html"> 112</a></span> <span class="keyword">struct </span><a class="code" href="structentt_1_1allocation__deleter.html">allocation_deleter</a>: <span class="keyword">private</span> Allocator {</div>
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<div class="line"><a name="l00114"></a><span class="lineno"><a class="line" href="structentt_1_1allocation__deleter.html#abce9d9de78a31b79e98745f4e029c863"> 114</a></span>  <span class="keyword">using</span> <a class="code" href="structentt_1_1allocation__deleter.html#abce9d9de78a31b79e98745f4e029c863">allocator_type</a> = Allocator;</div>
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<div class="line"><a name="l00116"></a><span class="lineno"><a class="line" href="structentt_1_1allocation__deleter.html#a37186f63eb16409b00b0261041b68c5c"> 116</a></span>  <span class="keyword">using</span> <a class="code" href="structentt_1_1allocation__deleter.html#a37186f63eb16409b00b0261041b68c5c">pointer</a> = <span class="keyword">typename</span> std::allocator_traits<Allocator>::pointer;</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  </div>
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<div class="line"><a name="l00122"></a><span class="lineno"><a class="line" href="structentt_1_1allocation__deleter.html#a1e40e8f850d327ed13dbb3eab6886b7d"> 122</a></span>  <a class="code" href="structentt_1_1allocation__deleter.html#a1e40e8f850d327ed13dbb3eab6886b7d">allocation_deleter</a>(<span class="keyword">const</span> <a class="code" href="structentt_1_1allocation__deleter.html#abce9d9de78a31b79e98745f4e029c863">allocator_type</a> &alloc)</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  : Allocator{alloc} {}</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  </div>
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<div class="line"><a name="l00129"></a><span class="lineno"><a class="line" href="structentt_1_1allocation__deleter.html#acf2b15c272b52afdcbe6897713b0a4a4"> 129</a></span>  <span class="keywordtype">void</span> <a class="code" href="structentt_1_1allocation__deleter.html#acf2b15c272b52afdcbe6897713b0a4a4">operator()</a>(<a class="code" href="structentt_1_1allocation__deleter.html#a37186f63eb16409b00b0261041b68c5c">pointer</a> ptr) {</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keyword">using</span> alloc_traits = <span class="keyword">typename</span> std::allocator_traits<Allocator>;</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  alloc_traits::destroy(*<span class="keyword">this</span>, <a class="code" href="namespaceentt.html#a94ed50d1975e6adee73101eb05c88d73">to_address</a>(ptr));</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  alloc_traits::deallocate(*<span class="keyword">this</span>, ptr, 1u);</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  }</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> };</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  </div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="keyword">template</span><<span class="keyword">typename</span> Type, <span class="keyword">typename</span> Allocator, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a name="l00146"></a><span class="lineno"><a class="line" href="namespaceentt.html#a34acc7c30062bc75491ea6f8c6ad5078"> 146</a></span> <span class="keyword">auto</span> <a class="code" href="namespaceentt.html#a34acc7c30062bc75491ea6f8c6ad5078">allocate_unique</a>(Allocator &allocator, Args &&...args) {</div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  static_assert(!std::is_array_v<Type>, <span class="stringliteral">"Array types are not supported"</span>);</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  </div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keyword">using</span> alloc_traits = <span class="keyword">typename</span> std::allocator_traits<Allocator>::template rebind_traits<Type>;</div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keyword">using</span> allocator_type = <span class="keyword">typename</span> alloc_traits::allocator_type;</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  </div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  allocator_type alloc{allocator};</div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keyword">auto</span> ptr = alloc_traits::allocate(alloc, 1u);</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  </div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  ENTT_TRY {</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  alloc_traits::construct(alloc, <a class="code" href="namespaceentt.html#a94ed50d1975e6adee73101eb05c88d73">to_address</a>(ptr), std::forward<Args>(args)...);</div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  }</div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  ENTT_CATCH {</div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  alloc_traits::deallocate(alloc, ptr, 1u);</div>
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  ENTT_THROW;</div>
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  }</div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  </div>
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">return</span> std::unique_ptr<Type, allocation_deleter<allocator_type>>{ptr, alloc};</div>
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> }</div>
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  </div>
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<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="keyword">namespace </span>internal {</div>
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<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  </div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="keyword">template</span><<span class="keyword">typename</span> Type></div>
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="keyword">struct </span>uses_allocator_construction {</div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Allocator, <span class="keyword">typename</span>... Params></div>
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<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keyword">static</span> constexpr <span class="keyword">auto</span> args([[maybe_unused]] <span class="keyword">const</span> Allocator &allocator, Params &&...params) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keywordflow">if</span> constexpr(!std::uses_allocator_v<Type, Allocator> && std::is_constructible_v<Type, Params...>) {</div>
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordflow">return</span> std::forward_as_tuple(std::forward<Params>(params)...);</div>
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<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  static_assert(std::uses_allocator_v<Type, Allocator>, <span class="stringliteral">"Ill-formed request"</span>);</div>
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<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  </div>
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<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">if</span> constexpr(std::is_constructible_v<Type, std::allocator_arg_t, const Allocator &, Params...>) {</div>
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<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keywordflow">return</span> std::tuple<std::allocator_arg_t, <span class="keyword">const</span> Allocator &, Params &&...>(std::allocator_arg, allocator, std::forward<Params>(params)...);</div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  static_assert(std::is_constructible_v<Type, Params..., const Allocator &>, <span class="stringliteral">"Ill-formed request"</span>);</div>
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<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">return</span> std::forward_as_tuple(std::forward<Params>(params)..., allocator);</div>
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<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div>
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<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  }</div>
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<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  }</div>
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<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> };</div>
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<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  </div>
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<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="keyword">template</span><<span class="keyword">typename</span> Type, <span class="keyword">typename</span> Other></div>
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<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="keyword">struct </span>uses_allocator_construction<std::pair<Type, Other>> {</div>
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<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keyword">using</span> type = std::pair<Type, Other>;</div>
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<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  </div>
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<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Allocator, <span class="keyword">typename</span> First, <span class="keyword">typename</span> Second></div>
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<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keyword">static</span> constexpr <span class="keyword">auto</span> args(<span class="keyword">const</span> Allocator &allocator, std::piecewise_construct_t, First &&first, Second &&second) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keywordflow">return</span> std::make_tuple(</div>
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<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  std::piecewise_construct,</div>
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<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  std::apply([&allocator](<span class="keyword">auto</span> &&...curr) { <span class="keywordflow">return</span> uses_allocator_construction<Type>::args(allocator, std::forward<decltype(curr)>(curr)...); }, std::forward<First>(first)),</div>
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<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  std::apply([&allocator](<span class="keyword">auto</span> &&...curr) { <span class="keywordflow">return</span> uses_allocator_construction<Other>::args(allocator, std::forward<decltype(curr)>(curr)...); }, std::forward<Second>(second)));</div>
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<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  }</div>
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<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  </div>
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<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Allocator></div>
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<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keyword">static</span> constexpr <span class="keyword">auto</span> args(<span class="keyword">const</span> Allocator &allocator) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">return</span> uses_allocator_construction<type>::args(allocator, std::piecewise_construct, std::tuple<>{}, std::tuple<>{});</div>
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  }</div>
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<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  </div>
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<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Allocator, <span class="keyword">typename</span> First, <span class="keyword">typename</span> Second></div>
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<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keyword">static</span> constexpr <span class="keyword">auto</span> args(<span class="keyword">const</span> Allocator &allocator, First &&first, Second &&second) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keywordflow">return</span> uses_allocator_construction<type>::args(allocator, std::piecewise_construct, std::forward_as_tuple(std::forward<First>(first)), std::forward_as_tuple(std::forward<Second>(second)));</div>
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<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  }</div>
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<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  </div>
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<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Allocator, <span class="keyword">typename</span> First, <span class="keyword">typename</span> Second></div>
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<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keyword">static</span> constexpr <span class="keyword">auto</span> args(<span class="keyword">const</span> Allocator &allocator, <span class="keyword">const</span> std::pair<First, Second> &value) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">return</span> uses_allocator_construction<type>::args(allocator, std::piecewise_construct, std::forward_as_tuple(value.first), std::forward_as_tuple(value.second));</div>
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<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  }</div>
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<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  </div>
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<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Allocator, <span class="keyword">typename</span> First, <span class="keyword">typename</span> Second></div>
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<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keyword">static</span> constexpr <span class="keyword">auto</span> args(<span class="keyword">const</span> Allocator &allocator, std::pair<First, Second> &&value) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordflow">return</span> uses_allocator_construction<type>::args(allocator, std::piecewise_construct, std::forward_as_tuple(std::move(value.first)), std::forward_as_tuple(std::move(value.second)));</div>
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<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  }</div>
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<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> };</div>
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<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  </div>
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<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> } <span class="comment">// namespace internal</span></div>
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<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  </div>
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<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> <span class="keyword">template</span><<span class="keyword">typename</span> Type, <span class="keyword">typename</span> Allocator, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a name="l00246"></a><span class="lineno"><a class="line" href="namespaceentt.html#ace7e8d47071e1556a9ce83772468215e"> 246</a></span> constexpr <span class="keyword">auto</span> <a class="code" href="namespaceentt.html#ace7e8d47071e1556a9ce83772468215e">uses_allocator_construction_args</a>(<span class="keyword">const</span> Allocator &allocator, Args &&...args) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">return</span> internal::uses_allocator_construction<Type>::args(allocator, std::forward<Args>(args)...);</div>
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<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> }</div>
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<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  </div>
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<div class="line"><a name="l00263"></a><span class="lineno"> 263</span> <span class="keyword">template</span><<span class="keyword">typename</span> Type, <span class="keyword">typename</span> Allocator, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a name="l00264"></a><span class="lineno"><a class="line" href="namespaceentt.html#a12e4d0c58f9c4cc6f5513c39c530b9b7"> 264</a></span> constexpr Type <a class="code" href="namespaceentt.html#a12e4d0c58f9c4cc6f5513c39c530b9b7">make_obj_using_allocator</a>(<span class="keyword">const</span> Allocator &allocator, Args &&...args) {</div>
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<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">return</span> std::make_from_tuple<Type>(internal::uses_allocator_construction<Type>::args(allocator, std::forward<Args>(args)...));</div>
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<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> }</div>
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<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  </div>
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<div class="line"><a name="l00282"></a><span class="lineno"> 282</span> <span class="keyword">template</span><<span class="keyword">typename</span> Type, <span class="keyword">typename</span> Allocator, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a name="l00283"></a><span class="lineno"><a class="line" href="namespaceentt.html#a62b604f9b3045c7f380e86738d8623a9"> 283</a></span> constexpr Type *<a class="code" href="namespaceentt.html#a62b604f9b3045c7f380e86738d8623a9">uninitialized_construct_using_allocator</a>(Type *value, <span class="keyword">const</span> Allocator &allocator, Args &&...args) {</div>
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<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keywordflow">return</span> std::apply([&](<span class="keyword">auto</span> &&...curr) { <span class="keywordflow">return</span> <span class="keyword">new</span>(value) Type(std::forward<decltype(curr)>(curr)...); }, internal::uses_allocator_construction<Type>::args(allocator, std::forward<Args>(args)...));</div>
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<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> }</div>
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<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  </div>
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<div class="line"><a name="l00287"></a><span class="lineno"> 287</span> } <span class="comment">// namespace entt</span></div>
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<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  </div>
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<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> <span class="preprocessor">#endif</span></div>
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<div class="ttc" id="anamespaceentt_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="dense__map_8hpp_source.html#l00022">dense_map.hpp:22</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a122ae54373a080574c45c77319cec7f7"><div class="ttname"><a href="namespaceentt.html#a122ae54373a080574c45c77319cec7f7">entt::propagate_on_container_move_assignment</a></div><div class="ttdeci">constexpr void propagate_on_container_move_assignment([[maybe_unused]] Allocator &lhs, [[maybe_unused]] Allocator &rhs)</div><div class="ttdoc">Utility function to design allocation-aware containers.</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00049">memory.hpp:49</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a12e4d0c58f9c4cc6f5513c39c530b9b7"><div class="ttname"><a href="namespaceentt.html#a12e4d0c58f9c4cc6f5513c39c530b9b7">entt::make_obj_using_allocator</a></div><div class="ttdeci">constexpr Type make_obj_using_allocator(const Allocator &allocator, Args &&...args)</div><div class="ttdoc">Uses-allocator construction utility (waiting for C++20).</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00264">memory.hpp:264</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a1359cd624e6726f884df34df66656855"><div class="ttname"><a href="namespaceentt.html#a1359cd624e6726f884df34df66656855">entt::propagate_on_container_swap</a></div><div class="ttdeci">constexpr void propagate_on_container_swap([[maybe_unused]] Allocator &lhs, [[maybe_unused]] Allocator &rhs)</div><div class="ttdoc">Utility function to design allocation-aware containers.</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00062">memory.hpp:62</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a28fe7952c2a11ebc2b47d95fb749adda"><div class="ttname"><a href="namespaceentt.html#a28fe7952c2a11ebc2b47d95fb749adda">entt::fast_mod</a></div><div class="ttdeci">constexpr std::size_t fast_mod(const std::size_t value, const std::size_t mod)</div><div class="ttdoc">Fast module utility function (powers of two only).</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00102">memory.hpp:102</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a34acc7c30062bc75491ea6f8c6ad5078"><div class="ttname"><a href="namespaceentt.html#a34acc7c30062bc75491ea6f8c6ad5078">entt::allocate_unique</a></div><div class="ttdeci">auto allocate_unique(Allocator &allocator, Args &&...args)</div><div class="ttdoc">Allows std::unique_ptr to use allocators (waiting for C++20).</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00146">memory.hpp:146</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a3755517604de1d9d3f3e0a5549c750c5"><div class="ttname"><a href="namespaceentt.html#a3755517604de1d9d3f3e0a5549c750c5">entt::is_power_of_two</a></div><div class="ttdeci">constexpr bool is_power_of_two(const std::size_t value)</div><div class="ttdoc">Checks whether a value is a power of two or not.</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00076">memory.hpp:76</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a5a2dbf5d86123af800abdd8fe69542ca"><div class="ttname"><a href="namespaceentt.html#a5a2dbf5d86123af800abdd8fe69542ca">entt::next_power_of_two</a></div><div class="ttdeci">constexpr std::size_t next_power_of_two(const std::size_t value)</div><div class="ttdoc">Computes the smallest power of two greater than or equal to a value.</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00085">memory.hpp:85</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a62b604f9b3045c7f380e86738d8623a9"><div class="ttname"><a href="namespaceentt.html#a62b604f9b3045c7f380e86738d8623a9">entt::uninitialized_construct_using_allocator</a></div><div class="ttdeci">constexpr Type * uninitialized_construct_using_allocator(Type *value, const Allocator &allocator, Args &&...args)</div><div class="ttdoc">Uses-allocator construction utility (waiting for C++20).</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00283">memory.hpp:283</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a94ed50d1975e6adee73101eb05c88d73"><div class="ttname"><a href="namespaceentt.html#a94ed50d1975e6adee73101eb05c88d73">entt::to_address</a></div><div class="ttdeci">constexpr auto to_address(Type &&ptr)</div><div class="ttdoc">Unwraps fancy pointers, does nothing otherwise (waiting for C++20).</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00021">memory.hpp:21</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a9eb49df8bf1b69e836039b76e5b9938e"><div class="ttname"><a href="namespaceentt.html#a9eb49df8bf1b69e836039b76e5b9938e">entt::propagate_on_container_copy_assignment</a></div><div class="ttdeci">constexpr void propagate_on_container_copy_assignment([[maybe_unused]] Allocator &lhs, [[maybe_unused]] Allocator &rhs)</div><div class="ttdoc">Utility function to design allocation-aware containers.</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00036">memory.hpp:36</a></div></div>
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<div class="ttc" id="anamespaceentt_html_ace7e8d47071e1556a9ce83772468215e"><div class="ttname"><a href="namespaceentt.html#ace7e8d47071e1556a9ce83772468215e">entt::uses_allocator_construction_args</a></div><div class="ttdeci">constexpr auto uses_allocator_construction_args(const Allocator &allocator, Args &&...args)</div><div class="ttdoc">Uses-allocator construction utility (waiting for C++20).</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00246">memory.hpp:246</a></div></div>
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<div class="ttc" id="anamespaceentt_html_aef08fc4202f32f712bde26f55db463cb"><div class="ttname"><a href="namespaceentt.html#aef08fc4202f32f712bde26f55db463cb">entt::swap</a></div><div class="ttdeci">void swap(compressed_pair< First, Second > &lhs, compressed_pair< First, Second > &rhs)</div><div class="ttdoc">Swaps two compressed pair objects.</div><div class="ttdef"><b>Definition:</b> <a href="compressed__pair_8hpp_source.html#l00248">compressed_pair.hpp:248</a></div></div>
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<div class="ttc" id="astructentt_1_1allocation__deleter_html"><div class="ttname"><a href="structentt_1_1allocation__deleter.html">entt::allocation_deleter</a></div><div class="ttdoc">Deleter for allocator-aware unique pointers (waiting for C++20).</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00112">memory.hpp:112</a></div></div>
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<div class="ttc" id="astructentt_1_1allocation__deleter_html_a1e40e8f850d327ed13dbb3eab6886b7d"><div class="ttname"><a href="structentt_1_1allocation__deleter.html#a1e40e8f850d327ed13dbb3eab6886b7d">entt::allocation_deleter::allocation_deleter</a></div><div class="ttdeci">allocation_deleter(const allocator_type &alloc)</div><div class="ttdoc">Inherited constructors.</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00122">memory.hpp:122</a></div></div>
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<div class="ttc" id="astructentt_1_1allocation__deleter_html_a37186f63eb16409b00b0261041b68c5c"><div class="ttname"><a href="structentt_1_1allocation__deleter.html#a37186f63eb16409b00b0261041b68c5c">entt::allocation_deleter::pointer</a></div><div class="ttdeci">typename std::allocator_traits< Allocator >::pointer pointer</div><div class="ttdoc">Pointer type.</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00116">memory.hpp:116</a></div></div>
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<div class="ttc" id="astructentt_1_1allocation__deleter_html_abce9d9de78a31b79e98745f4e029c863"><div class="ttname"><a href="structentt_1_1allocation__deleter.html#abce9d9de78a31b79e98745f4e029c863">entt::allocation_deleter::allocator_type</a></div><div class="ttdeci">Allocator allocator_type</div><div class="ttdoc">Allocator type.</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00114">memory.hpp:114</a></div></div>
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<div class="ttc" id="astructentt_1_1allocation__deleter_html_acf2b15c272b52afdcbe6897713b0a4a4"><div class="ttname"><a href="structentt_1_1allocation__deleter.html#acf2b15c272b52afdcbe6897713b0a4a4">entt::allocation_deleter::operator()</a></div><div class="ttdeci">void operator()(pointer ptr)</div><div class="ttdoc">Destroys the pointed object and deallocates its memory.</div><div class="ttdef"><b>Definition:</b> <a href="memory_8hpp_source.html#l00129">memory.hpp:129</a></div></div>
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