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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_a53318306f6ac0f7fe657839abd543ab.html">signal</a></li> </ul>
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<div class="headertitle"><div class="title">delegate.hpp</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="preprocessor">#ifndef ENTT_SIGNAL_DELEGATE_HPP</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="preprocessor">#define ENTT_SIGNAL_DELEGATE_HPP</span></div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span> </div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="preprocessor">#include <cstddef></span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#include <functional></span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="preprocessor">#include <tuple></span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include <type_traits></span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include <utility></span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include "../config/config.h"</span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#include "../core/type_traits.hpp"</span></div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#include "fwd.hpp"</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span> </div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceentt.html">entt</a> {</div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span></div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="keyword">namespace </span>internal {</div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> </div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="keyword">template</span><<span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="keyword">constexpr</span> <span class="keyword">auto</span> function_pointer(Ret (*)(Args...)) -> Ret (*)(Args...);</div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> </div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="keyword">template</span><<span class="keyword">typename</span> Ret, <span class="keyword">typename</span> Type, <span class="keyword">typename</span>... Args, <span class="keyword">typename</span> Other></div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="keyword">constexpr</span> <span class="keyword">auto</span> function_pointer(Ret (*)(Type, Args...), Other &&) -> Ret (*)(Args...);</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">template</span><<span class="keyword">typename</span> Class, <span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args, <span class="keyword">typename</span>... Other></div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="keyword">constexpr</span> <span class="keyword">auto</span> function_pointer(Ret (Class::*)(Args...), Other &&...) -> Ret (*)(Args...);</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="keyword">template</span><<span class="keyword">typename</span> Class, <span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args, <span class="keyword">typename</span>... Other></div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="keyword">constexpr</span> <span class="keyword">auto</span> function_pointer(Ret (Class::*)(Args...) <span class="keyword">const</span>, Other &&...) -> Ret (*)(Args...);</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="keyword">template</span><<span class="keyword">typename</span> Class, <span class="keyword">typename</span> Type, <span class="keyword">typename</span>... Other, <span class="keyword">typename</span> = std::enable_if_t<std::is_member_object_pointer_v<Type Class::*>>></div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="keyword">constexpr</span> <span class="keyword">auto</span> function_pointer(Type Class::*, Other &&...) -> Type (*)();</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> </div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="keyword">template</span><<span class="keyword">typename</span>... Type></div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="keyword">using </span>function_pointer_t = <span class="keyword">decltype</span>(function_pointer(std::declval<Type>()...));</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> </div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="keyword">template</span><<span class="keyword">typename</span>... Class, <span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span>[[nodiscard]] <span class="keyword">constexpr</span> <span class="keyword">auto</span> index_sequence_for(Ret (*)(Args...)) {</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keywordflow">return</span> std::index_sequence_for<Class..., Args...>{};</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span>}</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> </div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span>} <span class="comment">// namespace internal</span></div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span></div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span><span class="keyword">template</span><<span class="keyword">typename</span>></div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"><a class="line" href="classentt_1_1delegate.html"> 51</a></span><span class="keyword">class </span><a class="code hl_class" href="classentt_1_1delegate.html">delegate</a>;</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span></div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="keyword">template</span><<span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="keyword">class </span><a class="code hl_class" href="classentt_1_1delegate.html">delegate</a><Ret(Args...)> {</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keyword">using </span>return_type = std::remove_const_t<Ret>;</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">using </span>delegate_type = return_type(<span class="keyword">const</span> <span class="keywordtype">void</span> *, Args...);</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keyword">template</span><<span class="keyword">auto</span> Candidate, std::size_t... Index></div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> [[nodiscard]] <span class="keyword">auto</span> wrap(std::index_sequence<Index...>) <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keywordflow">return</span> [](<span class="keyword">const</span> <span class="keywordtype">void</span> *, Args... args) -> return_type {</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> [[maybe_unused]] <span class="keyword">const</span> <span class="keyword">auto</span> arguments = std::forward_as_tuple(std::forward<Args>(args)...);</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> [[maybe_unused]] <span class="keyword">constexpr</span> <span class="keyword">auto</span> offset = !std::is_invocable_r_v<Ret, <span class="keyword">decltype</span>(Candidate), <a class="code hl_typedef" href="namespaceentt.html#a9ac8221f536d5ecb512dc433ec7a4fd1">type_list_element_t</a><Index, <a class="code hl_struct" href="structentt_1_1type__list.html">type_list<Args...></a>>...> * (<span class="keyword">sizeof</span>...(Args) - <span class="keyword">sizeof</span>...(Index));</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>Ret<span class="keyword">></span>(std::invoke(Candidate, std::forward<<a class="code hl_typedef" href="namespaceentt.html#a9ac8221f536d5ecb512dc433ec7a4fd1">type_list_element_t</a><Index + offset, <a class="code hl_struct" href="structentt_1_1type__list.html">type_list<Args...></a>>>(std::get<Index + offset>(arguments))...));</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> };</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> </div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="keyword">template</span><<span class="keyword">auto</span> Candidate, <span class="keyword">typename</span> Type, std::size_t... Index></div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> [[nodiscard]] <span class="keyword">auto</span> wrap(Type &, std::index_sequence<Index...>) <span class="keyword">noexcept</span> {</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">const</span> <span class="keywordtype">void</span> *payload, Args... args) -> return_type {</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> Type *curr = <span class="keyword">static_cast<</span>Type *<span class="keyword">></span>(<span class="keyword">const_cast<</span><a class="code hl_typedef" href="namespaceentt.html#a13168ef82af733bfe584f34f29472d20">constness_as_t<void, Type></a> *<span class="keyword">></span>(payload));</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> [[maybe_unused]] <span class="keyword">const</span> <span class="keyword">auto</span> arguments = std::forward_as_tuple(std::forward<Args>(args)...);</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> [[maybe_unused]] <span class="keyword">constexpr</span> <span class="keyword">auto</span> offset = !std::is_invocable_r_v<Ret, <span class="keyword">decltype</span>(Candidate), Type &, <a class="code hl_typedef" href="namespaceentt.html#a9ac8221f536d5ecb512dc433ec7a4fd1">type_list_element_t</a><Index, type_list<Args...>>...> * (<span class="keyword">sizeof</span>...(Args) - <span class="keyword">sizeof</span>...(Index));</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>Ret<span class="keyword">></span>(std::invoke(Candidate, *curr, std::forward<<a class="code hl_typedef" href="namespaceentt.html#a9ac8221f536d5ecb512dc433ec7a4fd1">type_list_element_t</a><Index + offset, type_list<Args...>>>(std::get<Index + offset>(arguments))...));</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 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> </div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> <span class="keyword">template</span><<span class="keyword">auto</span> Candidate, <span class="keyword">typename</span> Type, std::size_t... Index></div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> [[nodiscard]] <span class="keyword">auto</span> wrap(Type *, std::index_sequence<Index...>) <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="keywordflow">return</span> [](<span class="keyword">const</span> <span class="keywordtype">void</span> *payload, Args... args) -> return_type {</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> Type *curr = <span class="keyword">static_cast<</span>Type *<span class="keyword">></span>(<span class="keyword">const_cast<</span><a class="code hl_typedef" href="namespaceentt.html#a13168ef82af733bfe584f34f29472d20">constness_as_t<void, Type></a> *<span class="keyword">></span>(payload));</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> [[maybe_unused]] <span class="keyword">const</span> <span class="keyword">auto</span> arguments = std::forward_as_tuple(std::forward<Args>(args)...);</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> [[maybe_unused]] <span class="keyword">constexpr</span> <span class="keyword">auto</span> offset = !std::is_invocable_r_v<Ret, <span class="keyword">decltype</span>(Candidate), Type *, <a class="code hl_typedef" href="namespaceentt.html#a9ac8221f536d5ecb512dc433ec7a4fd1">type_list_element_t</a><Index, type_list<Args...>>...> * (<span class="keyword">sizeof</span>...(Args) - <span class="keyword">sizeof</span>...(Index));</div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>Ret<span class="keyword">></span>(std::invoke(Candidate, curr, std::forward<<a class="code hl_typedef" href="namespaceentt.html#a9ac8221f536d5ecb512dc433ec7a4fd1">type_list_element_t</a><Index + offset, type_list<Args...>>>(std::get<Index + offset>(arguments))...));</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="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> }</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> </div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span><span class="keyword">public</span>:</div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> <span class="keyword">using </span>function_type = Ret(<span class="keyword">const</span> <span class="keywordtype">void</span> *, Args...);</div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> <span class="keyword">using </span>type = Ret(Args...);</div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="keyword">using </span>result_type = Ret;</div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span></div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <a class="code hl_function" href="namespaceentt.html#acaa5569564e913ef41b15b06e3dca0f4">delegate</a>() noexcept = default;</div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span></div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> template<auto Candidate, typename... Type></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="namespaceentt.html#acaa5569564e913ef41b15b06e3dca0f4">delegate</a>(connect_arg_t<Candidate>, Type &&...value_or_instance) noexcept {</div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> connect<Candidate>(std::forward<Type>(value_or_instance)...);</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 class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span></div>
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<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> <a class="code hl_function" href="namespaceentt.html#acaa5569564e913ef41b15b06e3dca0f4">delegate</a>(function_type *function, <span class="keyword">const</span> <span class="keywordtype">void</span> *payload = <span class="keyword">nullptr</span>) noexcept {</div>
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<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> connect(function, payload);</div>
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<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> }</div>
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<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span></div>
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<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate></div>
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<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> <span class="keywordtype">void</span> connect() noexcept {</div>
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<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> instance = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> </div>
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<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(std::is_invocable_r_v<Ret, <span class="keyword">decltype</span>(Candidate), Args...>) {</div>
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<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> fn = [](<span class="keyword">const</span> <span class="keywordtype">void</span> *, Args... args) -> return_type {</div>
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<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> <span class="keywordflow">return</span> Ret(std::invoke(Candidate, std::forward<Args>(args)...));</div>
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<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> };</div>
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<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(std::is_member_pointer_v<<span class="keyword">decltype</span>(Candidate)>) {</div>
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<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> fn = wrap<Candidate>(internal::index_sequence_for<<a class="code hl_typedef" href="namespaceentt.html#a9ac8221f536d5ecb512dc433ec7a4fd1">type_list_element_t</a><0, type_list<Args...>>>(internal::function_pointer_t<<span class="keyword">decltype</span>(Candidate)>{}));</div>
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<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> fn = wrap<Candidate>(internal::index_sequence_for(internal::function_pointer_t<<span class="keyword">decltype</span>(Candidate)>{}));</div>
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<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> }</div>
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<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> }</div>
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<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span></div>
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<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> <span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate, <span class="keyword">typename</span> Type></div>
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<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> <span class="keywordtype">void</span> connect(Type &value_or_instance) <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> instance = &value_or_instance;</div>
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<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> </div>
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<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(std::is_invocable_r_v<Ret, <span class="keyword">decltype</span>(Candidate), Type &, Args...>) {</div>
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<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> fn = [](<span class="keyword">const</span> <span class="keywordtype">void</span> *payload, Args... args) -> return_type {</div>
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<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> Type *curr = <span class="keyword">static_cast<</span>Type *<span class="keyword">></span>(<span class="keyword">const_cast<</span><a class="code hl_typedef" href="namespaceentt.html#a13168ef82af733bfe584f34f29472d20">constness_as_t<void, Type></a> *<span class="keyword">></span>(payload));</div>
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<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> <span class="keywordflow">return</span> Ret(std::invoke(Candidate, *curr, std::forward<Args>(args)...));</div>
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<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> };</div>
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<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> fn = wrap<Candidate>(value_or_instance, internal::index_sequence_for(internal::function_pointer_t<<span class="keyword">decltype</span>(Candidate), Type>{}));</div>
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<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> }</div>
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<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> }</div>
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<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span></div>
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<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> <span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate, <span class="keyword">typename</span> Type></div>
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<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> <span class="keywordtype">void</span> connect(Type *value_or_instance) <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> instance = value_or_instance;</div>
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<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> </div>
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<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(std::is_invocable_r_v<Ret, <span class="keyword">decltype</span>(Candidate), Type *, Args...>) {</div>
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<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> fn = [](<span class="keyword">const</span> <span class="keywordtype">void</span> *payload, Args... args) -> return_type {</div>
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<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> Type *curr = <span class="keyword">static_cast<</span>Type *<span class="keyword">></span>(<span class="keyword">const_cast<</span><a class="code hl_typedef" href="namespaceentt.html#a13168ef82af733bfe584f34f29472d20">constness_as_t<void, Type></a> *<span class="keyword">></span>(payload));</div>
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<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> <span class="keywordflow">return</span> Ret(std::invoke(Candidate, curr, std::forward<Args>(args)...));</div>
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<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> };</div>
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<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span> fn = wrap<Candidate>(value_or_instance, internal::index_sequence_for(internal::function_pointer_t<<span class="keyword">decltype</span>(Candidate), Type>{}));</div>
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<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span> }</div>
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<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span> }</div>
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<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span></div>
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<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span> <span class="keywordtype">void</span> connect(function_type *function, <span class="keyword">const</span> <span class="keywordtype">void</span> *payload = <span class="keyword">nullptr</span>) noexcept {</div>
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<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span> ENTT_ASSERT(function != <span class="keyword">nullptr</span>, <span class="stringliteral">"Uninitialized function pointer"</span>);</div>
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<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span> instance = payload;</div>
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<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span> fn = function;</div>
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<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span> }</div>
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<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span></div>
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<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span> <span class="keywordtype">void</span> reset() noexcept {</div>
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<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span> instance = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span> fn = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span> }</div>
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<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span></div>
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<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span> [[nodiscard]] function_type *target() const noexcept {</div>
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<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span> <span class="keywordflow">return</span> fn;</div>
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<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</span> }</div>
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<div class="line"><a id="l00239" name="l00239"></a><span class="lineno"> 239</span></div>
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<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span> [[nodiscard]] <span class="keyword">const</span> <span class="keywordtype">void</span> *data() const noexcept {</div>
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<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span> <span class="keywordflow">return</span> instance;</div>
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<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span> }</div>
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<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span></div>
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<div class="line"><a id="l00260" name="l00260"></a><span class="lineno"> 260</span> Ret operator()(Args... args)<span class="keyword"> const </span>{</div>
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<div class="line"><a id="l00261" name="l00261"></a><span class="lineno"> 261</span> ENTT_ASSERT(<span class="keyword">static_cast<</span><span class="keywordtype">bool</span><span class="keyword">></span>(*<span class="keyword">this</span>), <span class="stringliteral">"Uninitialized delegate"</span>);</div>
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<div class="line"><a id="l00262" name="l00262"></a><span class="lineno"> 262</span> <span class="keywordflow">return</span> fn(instance, std::forward<Args>(args)...);</div>
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<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"> 263</span> }</div>
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<div class="line"><a id="l00264" name="l00264"></a><span class="lineno"> 264</span></div>
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<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"> 269</span> [[nodiscard]] <span class="keyword">explicit</span> <span class="keyword">operator</span> bool() const noexcept {</div>
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<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"> 270</span> <span class="comment">// no need to also test instance</span></div>
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<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"> 271</span> <span class="keywordflow">return</span> !(fn == <span class="keyword">nullptr</span>);</div>
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<div class="line"><a id="l00272" name="l00272"></a><span class="lineno"> 272</span> }</div>
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<div class="line"><a id="l00273" name="l00273"></a><span class="lineno"> 273</span></div>
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<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"> 279</span> [[nodiscard]] <span class="keywordtype">bool</span> <a class="code hl_function" href="namespaceentt.html#af7c61951b721a1e3612cf536bd707501">operator==</a>(<span class="keyword">const</span> <a class="code hl_function" href="namespaceentt.html#acaa5569564e913ef41b15b06e3dca0f4">delegate</a><Ret(Args...)> &other) <span class="keyword">const</span> <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00280" name="l00280"></a><span class="lineno"> 280</span> <span class="keywordflow">return</span> fn == other.fn && instance == other.instance;</div>
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<div class="line"><a id="l00281" name="l00281"></a><span class="lineno"> 281</span> }</div>
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<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"> 282</span> </div>
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<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"> 283</span><span class="keyword">private</span>:</div>
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<div class="line"><a id="l00284" name="l00284"></a><span class="lineno"> 284</span> <span class="keyword">const</span> <span class="keywordtype">void</span> *instance{};</div>
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<div class="line"><a id="l00285" name="l00285"></a><span class="lineno"> 285</span> delegate_type *fn{};</div>
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<div class="line"><a id="l00286" name="l00286"></a><span class="lineno"> 286</span>};</div>
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<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"> 287</span></div>
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<div class="line"><a id="l00296" name="l00296"></a><span class="lineno"> 296</span><span class="keyword">template</span><<span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args></div>
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<div class="foldopen" id="foldopen00297" data-start="{" data-end="}">
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<div class="line"><a id="l00297" name="l00297"></a><span class="lineno"><a class="line" href="namespaceentt.html#ae663976796b773780f6136606c1a3f31"> 297</a></span>[[nodiscard]] <span class="keywordtype">bool</span> <a class="code hl_function" href="namespaceentt.html#ad9accc71a383509ada028f7fa2b767bf">operator!=</a>(<span class="keyword">const</span> <a class="code hl_class" href="classentt_1_1delegate.html">delegate</a><Ret(Args...)> &lhs, <span class="keyword">const</span> <a class="code hl_class" href="classentt_1_1delegate.html">delegate</a><Ret(Args...)> &rhs) <span class="keyword">noexcept</span> {</div>
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<div class="line"><a id="l00298" name="l00298"></a><span class="lineno"> 298</span> <span class="keywordflow">return</span> !(lhs == rhs);</div>
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<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"> 299</span>}</div>
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</div>
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<div class="line"><a id="l00300" name="l00300"></a><span class="lineno"> 300</span></div>
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<div class="line"><a id="l00305" name="l00305"></a><span class="lineno"> 305</span><span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate></div>
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<div class="line"><a id="l00306" name="l00306"></a><span class="lineno"><a class="line" href="namespaceentt.html#acaa5569564e913ef41b15b06e3dca0f4"> 306</a></span><a class="code hl_function" href="namespaceentt.html#acaa5569564e913ef41b15b06e3dca0f4">delegate</a>(<a class="code hl_struct" href="structentt_1_1connect__arg__t.html">connect_arg_t<Candidate></a>) -> <a class="code hl_class" href="classentt_1_1delegate.html">delegate</a><std::remove_pointer_t<internal::function_pointer_t<<span class="keyword">decltype</span>(Candidate)>>>;</div>
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<div class="line"><a id="l00307" name="l00307"></a><span class="lineno"> 307</span></div>
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<div class="line"><a id="l00313" name="l00313"></a><span class="lineno"> 313</span><span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate, <span class="keyword">typename</span> Type></div>
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<div class="line"><a id="l00314" name="l00314"></a><span class="lineno"><a class="line" href="namespaceentt.html#af883efa5bf613137f825c322df3ae801"> 314</a></span><a class="code hl_function" href="namespaceentt.html#acaa5569564e913ef41b15b06e3dca0f4">delegate</a>(<a class="code hl_struct" href="structentt_1_1connect__arg__t.html">connect_arg_t<Candidate></a>, Type &&) -> <a class="code hl_class" href="classentt_1_1delegate.html">delegate</a><std::remove_pointer_t<internal::function_pointer_t<<span class="keyword">decltype</span>(Candidate), Type>>>;</div>
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<div class="line"><a id="l00315" name="l00315"></a><span class="lineno"> 315</span></div>
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<div class="line"><a id="l00321" name="l00321"></a><span class="lineno"> 321</span><span class="keyword">template</span><<span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a id="l00322" name="l00322"></a><span class="lineno"><a class="line" href="namespaceentt.html#aaba06006a862fa5dc613e8561ac4e92c"> 322</a></span><a class="code hl_function" href="namespaceentt.html#acaa5569564e913ef41b15b06e3dca0f4">delegate</a>(Ret (*)(<span class="keyword">const</span> <span class="keywordtype">void</span> *, Args...), <span class="keyword">const</span> <span class="keywordtype">void</span> * = <span class="keyword">nullptr</span>) -> <a class="code hl_class" href="classentt_1_1delegate.html">delegate</a><Ret(Args...)>;</div>
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<div class="line"><a id="l00323" name="l00323"></a><span class="lineno"> 323</span> </div>
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<div class="line"><a id="l00324" name="l00324"></a><span class="lineno"> 324</span>} <span class="comment">// namespace entt</span></div>
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<div class="line"><a id="l00325" name="l00325"></a><span class="lineno"> 325</span> </div>
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<div class="line"><a id="l00326" name="l00326"></a><span class="lineno"> 326</span><span class="preprocessor">#endif</span></div>
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<div class="ttc" id="aclassentt_1_1delegate_html"><div class="ttname"><a href="classentt_1_1delegate.html">entt::delegate</a></div><div class="ttdoc">Basic delegate implementation.</div><div class="ttdef"><b>Definition</b> <a href="#l00051">delegate.hpp:51</a></div></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_a13168ef82af733bfe584f34f29472d20"><div class="ttname"><a href="namespaceentt.html#a13168ef82af733bfe584f34f29472d20">entt::constness_as_t</a></div><div class="ttdeci">typename constness_as< To, From >::type constness_as_t</div><div class="ttdoc">Alias template to facilitate the transcription of the constness.</div><div class="ttdef"><b>Definition</b> <a href="core_2type__traits_8hpp_source.html#l00841">type_traits.hpp:841</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a9ac8221f536d5ecb512dc433ec7a4fd1"><div class="ttname"><a href="namespaceentt.html#a9ac8221f536d5ecb512dc433ec7a4fd1">entt::type_list_element_t</a></div><div class="ttdeci">typename type_list_element< Index, List >::type type_list_element_t</div><div class="ttdoc">Helper type.</div><div class="ttdef"><b>Definition</b> <a href="core_2type__traits_8hpp_source.html#l00149">type_traits.hpp:149</a></div></div>
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<div class="ttc" id="anamespaceentt_html_acaa5569564e913ef41b15b06e3dca0f4"><div class="ttname"><a href="namespaceentt.html#acaa5569564e913ef41b15b06e3dca0f4">entt::delegate</a></div><div class="ttdeci">delegate(connect_arg_t< Candidate >) -> delegate< std::remove_pointer_t< internal::function_pointer_t< decltype(Candidate)> > ></div><div class="ttdoc">Deduction guide.</div></div>
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<div class="ttc" id="anamespaceentt_html_ad9accc71a383509ada028f7fa2b767bf"><div class="ttname"><a href="namespaceentt.html#ad9accc71a383509ada028f7fa2b767bf">entt::operator!=</a></div><div class="ttdeci">constexpr bool operator!=(const basic_hashed_string< Char > &lhs, const basic_hashed_string< Char > &rhs) noexcept</div><div class="ttdoc">Compares two hashed strings.</div><div class="ttdef"><b>Definition</b> <a href="hashed__string_8hpp_source.html#l00232">hashed_string.hpp:232</a></div></div>
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<div class="ttc" id="anamespaceentt_html_af7c61951b721a1e3612cf536bd707501"><div class="ttname"><a href="namespaceentt.html#af7c61951b721a1e3612cf536bd707501">entt::operator==</a></div><div class="ttdeci">constexpr bool operator==(const basic_hashed_string< Char > &lhs, const basic_hashed_string< Char > &rhs) noexcept</div><div class="ttdoc">Compares two hashed strings.</div><div class="ttdef"><b>Definition</b> <a href="hashed__string_8hpp_source.html#l00220">hashed_string.hpp:220</a></div></div>
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<div class="ttc" id="astructentt_1_1connect__arg__t_html"><div class="ttname"><a href="structentt_1_1connect__arg__t.html">entt::connect_arg_t</a></div><div class="ttdoc">Disambiguation tag for constructors and the like.</div><div class="ttdef"><b>Definition</b> <a href="signal_2fwd_8hpp_source.html#l00032">fwd.hpp:32</a></div></div>
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<div class="ttc" id="astructentt_1_1type__list_html"><div class="ttname"><a href="structentt_1_1type__list.html">entt::type_list</a></div><div class="ttdoc">A class to use to push around lists of types, nothing more.</div><div class="ttdef"><b>Definition</b> <a href="core_2type__traits_8hpp_source.html#l00111">type_traits.hpp:111</a></div></div>
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