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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="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef ENTT_SIGNAL_EMITTER_HPP</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#define ENTT_SIGNAL_EMITTER_HPP</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> </div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include <type_traits></span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include <functional></span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include <algorithm></span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include <utility></span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <cstdint></span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <memory></span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <vector></span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <list></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "../config/config.h"</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "../core/family.hpp"</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">namespace </span><a class="code" href="namespaceentt.html">entt</a> {</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">template</span><<span class="keyword">typename</span> Derived></div><div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html"> 42</a></span> <span class="keyword">class </span><a class="code" href="classentt_1_1Emitter.html">Emitter</a> {</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keyword">using</span> <a class="code" href="classentt_1_1Family.html">handler_family</a> = <a class="code" href="classentt_1_1Family.html">Family<struct InternalEmitterHandlerFamily></a>;</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">struct </span>BaseHandler {</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keyword">virtual</span> ~BaseHandler() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">virtual</span> <span class="keywordtype">bool</span> <a class="code" href="classentt_1_1Emitter.html#a4c54c5f15827be561e2912f7e91d1a6f">empty</a>() <span class="keyword">const</span> ENTT_NOEXCEPT = 0;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classentt_1_1Emitter.html#a4e722d57776f3185e39386e6f252c56b">clear</a>() ENTT_NOEXCEPT = 0;</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  };</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Event></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keyword">struct </span>Handler final: BaseHandler {</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">using</span> listener_type = std::function<void(const Event &, Derived &)>;</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keyword">using</span> element_type = std::pair<bool, listener_type>;</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keyword">using</span> container_type = std::list<element_type>;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">using</span> connection_type = <span class="keyword">typename</span> container_type::iterator;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">bool</span> <a class="code" href="classentt_1_1Emitter.html#a4c54c5f15827be561e2912f7e91d1a6f">empty</a>() <span class="keyword">const</span> ENTT_NOEXCEPT <span class="keyword">override</span> {</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keyword">auto</span> pred = [](<span class="keyword">auto</span> &&element) { <span class="keywordflow">return</span> element.first; };</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">return</span> std::all_of(onceL.cbegin(), onceL.cend(), pred) &&</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  std::all_of(onL.cbegin(), onL.cend(), pred);</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1Emitter.html#a4e722d57776f3185e39386e6f252c56b">clear</a>() ENTT_NOEXCEPT <span class="keyword">override</span> {</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">if</span>(publishing) {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">auto</span> func = [](<span class="keyword">auto</span> &&element) { element.first = <span class="keyword">true</span>; };</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  std::for_each(onceL.begin(), onceL.end(), func);</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  std::for_each(onL.begin(), onL.end(), func);</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  onceL.clear();</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  onL.clear();</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  }</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  }</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keyword">inline</span> connection_type <a class="code" href="classentt_1_1Emitter.html#a1145cc27235acf0e24e1956ba0b15393">once</a>(listener_type listener) {</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">return</span> onceL.emplace(onceL.cend(), <span class="keyword">false</span>, std::move(listener));</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keyword">inline</span> connection_type <a class="code" href="classentt_1_1Emitter.html#a1df9a54b806806add57c3168cbb2bdf1">on</a>(listener_type listener) {</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">return</span> onL.emplace(onL.cend(), <span class="keyword">false</span>, std::move(listener));</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  }</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1Emitter.html#ab15f07d10744ce8aa74964fa5623375c">erase</a>(connection_type conn) ENTT_NOEXCEPT {</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  conn->first = <span class="keyword">true</span>;</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">if</span>(!publishing) {</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">auto</span> pred = [](<span class="keyword">auto</span> &&element) { <span class="keywordflow">return</span> element.first; };</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  onceL.remove_if(pred);</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  onL.remove_if(pred);</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  }</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1Emitter.html#ab5141fd9793f53ef83af47c8c8a74b0e">publish</a>(<span class="keyword">const</span> Event &event, Derived &ref) {</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  container_type currentL;</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  onceL.swap(currentL);</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keyword">auto</span> func = [&event, &ref](<span class="keyword">auto</span> &&element) {</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">return</span> element.first ? void() : element.second(event, ref);</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  };</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  publishing = <span class="keyword">true</span>;</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  std::for_each(onL.rbegin(), onL.rend(), func);</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  std::for_each(currentL.rbegin(), currentL.rend(), func);</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  publishing = <span class="keyword">false</span>;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  onL.remove_if([](<span class="keyword">auto</span> &&element) { <span class="keywordflow">return</span> element.first; });</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  }</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordtype">bool</span> publishing{<span class="keyword">false</span>};</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  container_type onceL{};</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  container_type onL{};</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  };</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Event></div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  Handler<Event> & handler() ENTT_NOEXCEPT {</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keyword">const</span> std::size_t family = handler_family::type<Event>();</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">if</span>(!(family < handlers.size())) {</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  handlers.resize(family+1);</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  }</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> </div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">if</span>(!handlers[family]) {</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  handlers[family] = std::make_unique<Handler<Event>>();</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>Handler<Event> &<span class="keyword">></span>(*handlers[family]);</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Event></div><div class="line"><a name="l00136"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html#a1a5bb5d6a7626aec285cc73bfc1e80ef"> 136</a></span>  <span class="keyword">using</span> <a class="code" href="classentt_1_1Emitter.html#a1a5bb5d6a7626aec285cc73bfc1e80ef">Listener</a> = <span class="keyword">typename</span> Handler<Event>::listener_type;</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> </div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Event></div><div class="line"><a name="l00148"></a><span class="lineno"><a class="line" href="structentt_1_1Emitter_1_1Connection.html"> 148</a></span>  <span class="keyword">struct </span><a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a> final: <span class="keyword">private</span> Handler<Event>::connection_type {</div><div class="line"><a name="l00150"></a><span class="lineno"><a class="line" href="structentt_1_1Emitter_1_1Connection.html#a1cad71ec309b8c8b0beee324b9b65e5a"> 150</a></span>  <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classentt_1_1Emitter.html">Emitter</a>;</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> </div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a>() ENTT_NOEXCEPT = default;</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div><div class="line"><a name="l00159"></a><span class="lineno"><a class="line" href="structentt_1_1Emitter_1_1Connection.html#af059ef0d0aa727ea11e6873144fcbc1b"> 159</a></span>  <a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a>(typename Handler<Event>::connection_type conn)</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  : Handler<Event>::connection_type{std::move(conn)}</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  {}</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a>(<span class="keyword">const</span> <a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a> &) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a>(<a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a> &&) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a> & <a class="code" href="classentt_1_1Emitter.html#ace3403fe310953f720dbddff016fe715">operator=</a>(<span class="keyword">const</span> <a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a> &) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a> & <a class="code" href="classentt_1_1Emitter.html#ace3403fe310953f720dbddff016fe715">operator=</a>(<a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection</a> &&) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  };</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <a class="code" href="classentt_1_1Emitter.html#a69aedf4db58a11af9eb6c36859e951c8">Emitter</a>() ENTT_NOEXCEPT = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span> </div><div class="line"><a name="l00185"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html#ac713dddc6b8f7b056e3c1a8979a4e271"> 185</a></span>  <span class="keyword">virtual</span> <a class="code" href="classentt_1_1Emitter.html#ac713dddc6b8f7b056e3c1a8979a4e271">~Emitter</a>() ENTT_NOEXCEPT {</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  static_assert(std::is_base_of<<a class="code" href="classentt_1_1Emitter.html">Emitter<Derived></a>, Derived>::value, <span class="stringliteral">"!"</span>);</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <a class="code" href="classentt_1_1Emitter.html#a69aedf4db58a11af9eb6c36859e951c8">Emitter</a>(<span class="keyword">const</span> <a class="code" href="classentt_1_1Emitter.html">Emitter</a> &) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <a class="code" href="classentt_1_1Emitter.html#a69aedf4db58a11af9eb6c36859e951c8">Emitter</a>(<a class="code" href="classentt_1_1Emitter.html">Emitter</a> &&) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span> </div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <a class="code" href="classentt_1_1Emitter.html">Emitter</a> & <a class="code" href="classentt_1_1Emitter.html#ace3403fe310953f720dbddff016fe715">operator=</a>(<span class="keyword">const</span> <a class="code" href="classentt_1_1Emitter.html">Emitter</a> &) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <a class="code" href="classentt_1_1Emitter.html">Emitter</a> & <a class="code" href="classentt_1_1Emitter.html#ace3403fe310953f720dbddff016fe715">operator=</a>(<a class="code" href="classentt_1_1Emitter.html">Emitter</a> &&) = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> </div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Event, <span class="keyword">typename</span>... Args></div><div class="line"><a name="l00211"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html#ab5141fd9793f53ef83af47c8c8a74b0e"> 211</a></span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1Emitter.html#ab5141fd9793f53ef83af47c8c8a74b0e">publish</a>(Args &&... args) {</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  handler<Event>().<a class="code" href="classentt_1_1Emitter.html#ab5141fd9793f53ef83af47c8c8a74b0e">publish</a>({ std::forward<Args>(args)... }, *static_cast<Derived *>(<span class="keyword">this</span>));</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  }</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span> </div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Event></div><div class="line"><a name="l00236"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html#a1df9a54b806806add57c3168cbb2bdf1"> 236</a></span>  <a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection<Event></a> <a class="code" href="classentt_1_1Emitter.html#a1df9a54b806806add57c3168cbb2bdf1">on</a>(<a class="code" href="classentt_1_1Emitter.html#a1a5bb5d6a7626aec285cc73bfc1e80ef">Listener<Event></a> listener) {</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">return</span> handler<Event>().<a class="code" href="classentt_1_1Emitter.html#a1df9a54b806806add57c3168cbb2bdf1">on</a>(std::move(listener));</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  }</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span> </div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Event></div><div class="line"><a name="l00261"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html#a1145cc27235acf0e24e1956ba0b15393"> 261</a></span>  <a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection<Event></a> <a class="code" href="classentt_1_1Emitter.html#a1145cc27235acf0e24e1956ba0b15393">once</a>(<a class="code" href="classentt_1_1Emitter.html#a1a5bb5d6a7626aec285cc73bfc1e80ef">Listener<Event></a> listener) {</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keywordflow">return</span> handler<Event>().<a class="code" href="classentt_1_1Emitter.html#a1145cc27235acf0e24e1956ba0b15393">once</a>(std::move(listener));</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  }</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span> </div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Event></div><div class="line"><a name="l00275"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html#ab15f07d10744ce8aa74964fa5623375c"> 275</a></span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1Emitter.html#ab15f07d10744ce8aa74964fa5623375c">erase</a>(<a class="code" href="structentt_1_1Emitter_1_1Connection.html">Connection<Event></a> conn) ENTT_NOEXCEPT {</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  handler<Event>().<a class="code" href="classentt_1_1Emitter.html#ab15f07d10744ce8aa74964fa5623375c">erase</a>(std::move(conn));</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  }</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span> </div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Event></div><div class="line"><a name="l00288"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html#a4e722d57776f3185e39386e6f252c56b"> 288</a></span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1Emitter.html#a4e722d57776f3185e39386e6f252c56b">clear</a>() ENTT_NOEXCEPT {</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  handler<Event>().<a class="code" href="classentt_1_1Emitter.html#a4e722d57776f3185e39386e6f252c56b">clear</a>();</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  }</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span> </div><div class="line"><a name="l00298"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html#a12ce32d79978c671a4d72532cd8e33f7"> 298</a></span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1Emitter.html#a12ce32d79978c671a4d72532cd8e33f7">clear</a>() ENTT_NOEXCEPT {</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  std::for_each(handlers.begin(), handlers.end(), [](<span class="keyword">auto</span> &&handler) {</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">return</span> handler ? handler->clear() : void();</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  });</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  }</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span> </div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  <span class="keyword">template</span><<span class="keyword">typename</span> Event></div><div class="line"><a name="l00310"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html#a4c54c5f15827be561e2912f7e91d1a6f"> 310</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classentt_1_1Emitter.html#a4c54c5f15827be561e2912f7e91d1a6f">empty</a>() const ENTT_NOEXCEPT {</div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keyword">const</span> std::size_t family = handler_family::type<Event>();</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span> </div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="keywordflow">return</span> (!(family < handlers.size()) ||</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  !handlers[family] ||</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keyword">static_cast<</span>Handler<Event> &<span class="keyword">></span>(*handlers[family]).empty());</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  }</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span> </div><div class="line"><a name="l00322"></a><span class="lineno"><a class="line" href="classentt_1_1Emitter.html#a733f11dc3c15aa910e3f2e6f167b62fd"> 322</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classentt_1_1Emitter.html#a733f11dc3c15aa910e3f2e6f167b62fd">empty</a>() const ENTT_NOEXCEPT {</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="keywordflow">return</span> std::all_of(handlers.cbegin(), handlers.cend(), [](<span class="keyword">auto</span> &&handler) {</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  <span class="keywordflow">return</span> !handler || handler->empty();</div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  });</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  }</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span> </div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="keyword">private</span>:</div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  std::vector<std::unique_ptr<BaseHandler>> handlers{};</div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span> };</div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span> </div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span> </div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span> }</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span> </div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span> <span class="preprocessor">#endif // ENTT_SIGNAL_EMITTER_HPP</span></div><div class="ttc" id="classentt_1_1Emitter_html_a4c54c5f15827be561e2912f7e91d1a6f"><div class="ttname"><a href="classentt_1_1Emitter.html#a4c54c5f15827be561e2912f7e91d1a6f">entt::Emitter::empty</a></div><div class="ttdeci">bool empty() const ENTT_NOEXCEPT</div><div class="ttdoc">Checks if there are listeners registered for the specific event. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00310">emitter.hpp:310</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_a733f11dc3c15aa910e3f2e6f167b62fd"><div class="ttname"><a href="classentt_1_1Emitter.html#a733f11dc3c15aa910e3f2e6f167b62fd">entt::Emitter::empty</a></div><div class="ttdeci">bool empty() const ENTT_NOEXCEPT</div><div class="ttdoc">Checks if there are listeners registered with the event emitter. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00322">emitter.hpp:322</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_a1df9a54b806806add57c3168cbb2bdf1"><div class="ttname"><a href="classentt_1_1Emitter.html#a1df9a54b806806add57c3168cbb2bdf1">entt::Emitter::on</a></div><div class="ttdeci">Connection< Event > on(Listener< Event > listener)</div><div class="ttdoc">Registers a long-lived listener with the event emitter. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00236">emitter.hpp:236</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_ace3403fe310953f720dbddff016fe715"><div class="ttname"><a href="classentt_1_1Emitter.html#ace3403fe310953f720dbddff016fe715">entt::Emitter::operator=</a></div><div class="ttdeci">Emitter & operator=(const Emitter &)=delete</div><div class="ttdoc">Copying an emitter isn&#39;t allowed. </div></div>
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<div class="ttc" id="namespaceentt_html"><div class="ttname"><a href="namespaceentt.html">entt</a></div><div class="ttdoc">EnTT default namespace. </div><div class="ttdef"><b>Definition:</b> <a href="algorithm_8hpp_source.html#l00010">algorithm.hpp:10</a></div></div>
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<div class="ttc" id="structentt_1_1Emitter_1_1Connection_html"><div class="ttname"><a href="structentt_1_1Emitter_1_1Connection.html">entt::Emitter::Connection</a></div><div class="ttdoc">Generic connection type for events. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00148">emitter.hpp:148</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_ab5141fd9793f53ef83af47c8c8a74b0e"><div class="ttname"><a href="classentt_1_1Emitter.html#ab5141fd9793f53ef83af47c8c8a74b0e">entt::Emitter::publish</a></div><div class="ttdeci">void publish(Args &&... args)</div><div class="ttdoc">Emits the given event. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00211">emitter.hpp:211</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_a1145cc27235acf0e24e1956ba0b15393"><div class="ttname"><a href="classentt_1_1Emitter.html#a1145cc27235acf0e24e1956ba0b15393">entt::Emitter::once</a></div><div class="ttdeci">Connection< Event > once(Listener< Event > listener)</div><div class="ttdoc">Registers a short-lived listener with the event emitter. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00261">emitter.hpp:261</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_a4e722d57776f3185e39386e6f252c56b"><div class="ttname"><a href="classentt_1_1Emitter.html#a4e722d57776f3185e39386e6f252c56b">entt::Emitter::clear</a></div><div class="ttdeci">void clear() ENTT_NOEXCEPT</div><div class="ttdoc">Disconnects all the listeners for the given event type. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00288">emitter.hpp:288</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_a12ce32d79978c671a4d72532cd8e33f7"><div class="ttname"><a href="classentt_1_1Emitter.html#a12ce32d79978c671a4d72532cd8e33f7">entt::Emitter::clear</a></div><div class="ttdeci">void clear() ENTT_NOEXCEPT</div><div class="ttdoc">Disconnects all the listeners. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00298">emitter.hpp:298</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html"><div class="ttname"><a href="classentt_1_1Emitter.html">entt::Emitter</a></div><div class="ttdoc">General purpose event emitter. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00042">emitter.hpp:42</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_a69aedf4db58a11af9eb6c36859e951c8"><div class="ttname"><a href="classentt_1_1Emitter.html#a69aedf4db58a11af9eb6c36859e951c8">entt::Emitter::Emitter</a></div><div class="ttdeci">Emitter() ENTT_NOEXCEPT=default</div><div class="ttdoc">Default constructor. </div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_ac713dddc6b8f7b056e3c1a8979a4e271"><div class="ttname"><a href="classentt_1_1Emitter.html#ac713dddc6b8f7b056e3c1a8979a4e271">entt::Emitter::~Emitter</a></div><div class="ttdeci">virtual ~Emitter() ENTT_NOEXCEPT</div><div class="ttdoc">Default destructor. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00185">emitter.hpp:185</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_ab15f07d10744ce8aa74964fa5623375c"><div class="ttname"><a href="classentt_1_1Emitter.html#ab15f07d10744ce8aa74964fa5623375c">entt::Emitter::erase</a></div><div class="ttdeci">void erase(Connection< Event > conn) ENTT_NOEXCEPT</div><div class="ttdoc">Disconnects a listener from the event emitter. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00275">emitter.hpp:275</a></div></div>
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<div class="ttc" id="classentt_1_1Emitter_html_a1a5bb5d6a7626aec285cc73bfc1e80ef"><div class="ttname"><a href="classentt_1_1Emitter.html#a1a5bb5d6a7626aec285cc73bfc1e80ef">entt::Emitter::Listener</a></div><div class="ttdeci">typename Handler< Event >::listener_type Listener</div><div class="ttdoc">Type of listeners accepted for the given event. </div><div class="ttdef"><b>Definition:</b> <a href="emitter_8hpp_source.html#l00136">emitter.hpp:136</a></div></div>
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<div class="ttc" id="classentt_1_1Family_html"><div class="ttname"><a href="classentt_1_1Family.html">entt::Family</a></div><div class="ttdoc">Dynamic identifier generator. </div><div class="ttdef"><b>Definition:</b> <a href="family_8hpp_source.html#l00022">family.hpp:22</a></div></div>
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