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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="preprocessor">#ifndef ENTT_ENTITY_OBSERVER_HPP</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="preprocessor">#define ENTT_ENTITY_OBSERVER_HPP</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;</div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="preprocessor">#include &lt;limits&gt;</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="preprocessor">#include &lt;cstddef&gt;</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="preprocessor">#include &lt;cstdint&gt;</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="preprocessor">#include &lt;utility&gt;</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor">#include &lt;type_traits&gt;</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor">#include &quot;../config/config.h&quot;</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="preprocessor">#include &quot;../core/type_traits.hpp&quot;</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor">#include &quot;registry.hpp&quot;</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor">#include &quot;storage.hpp&quot;</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor">#include &quot;entity.hpp&quot;</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="preprocessor">#include &quot;fwd.hpp&quot;</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceentt.html">entt</a> {</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>...&gt;</div><div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="structentt_1_1matcher.html"> 24</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structentt_1_1matcher.html">matcher</a> {};</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>...&gt;</div><div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="structentt_1_1basic__collector.html"> 34</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structentt_1_1basic__collector.html">basic_collector</a>;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;<span class="keyword">template</span>&lt;&gt;</div><div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="structentt_1_1basic__collector_3_4.html"> 46</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structentt_1_1basic__collector_3_4.html">basic_collector&lt;&gt;</a> {</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... AllOf, <span class="keyword">typename</span>... NoneOf&gt;</div><div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="structentt_1_1basic__collector_3_4.html#a0d5a3c7d8d96f79585930f93939136f0"> 54</a></span>&#160; <span class="keyword">static</span> constexpr <span class="keyword">auto</span> <a class="code" href="structentt_1_1basic__collector_3_4.html#a0d5a3c7d8d96f79585930f93939136f0">group</a>(<a class="code" href="structentt_1_1exclude__t.html">exclude_t&lt;NoneOf...&gt;</a> = {}) ENTT_NOEXCEPT {</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keywordflow">return</span> <a class="code" href="structentt_1_1basic__collector.html">basic_collector&lt;matcher&lt;type_list&lt;&gt;</a>, <a class="code" href="structentt_1_1type__list.html">type_list&lt;&gt;</a>, <a class="code" href="structentt_1_1type__list.html">type_list</a>&lt;NoneOf...&gt;, AllOf...&gt;&gt;{};</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; }</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> AnyOf&gt;</div><div class="line"><a name="l00064"></a><span class="lineno"><a class="line" href="structentt_1_1basic__collector_3_4.html#a634ac3a53ee686d7fb7121404b14c17e"> 64</a></span>&#160; <span class="keyword">static</span> constexpr <span class="keyword">auto</span> <a class="code" href="structentt_1_1basic__collector_3_4.html#a634ac3a53ee686d7fb7121404b14c17e">replace</a>() ENTT_NOEXCEPT {</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="keywordflow">return</span> <a class="code" href="structentt_1_1basic__collector.html">basic_collector&lt;matcher&lt;type_list&lt;&gt;</a>, <a class="code" href="structentt_1_1type__list.html">type_list&lt;&gt;</a>, AnyOf&gt;&gt;{};</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; }</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160;};</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Reject, <span class="keyword">typename</span>... Require, <span class="keyword">typename</span>... Rule, <span class="keyword">typename</span>... Other&gt;</div><div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html"> 78</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structentt_1_1basic__collector.html">basic_collector</a>&lt;<a class="code" href="structentt_1_1matcher.html">matcher</a>&lt;<a class="code" href="structentt_1_1type__list.html">type_list</a>&lt;Reject...&gt;, <a class="code" href="structentt_1_1type__list.html">type_list</a>&lt;Require...&gt;, Rule...&gt;, Other...&gt; {</div><div class="line"><a name="l00080"></a><span class="lineno"><a class="line" href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html#ac7c32cf26795aa4fc08d21597c68bc3d"> 80</a></span>&#160; <span class="keyword">using</span> <a class="code" href="structentt_1_1matcher.html">current_type</a> = <a class="code" href="structentt_1_1matcher.html">matcher</a>&lt;<a class="code" href="structentt_1_1type__list.html">type_list</a>&lt;Reject...&gt;, <a class="code" href="structentt_1_1type__list.html">type_list</a>&lt;Require...&gt;, Rule...&gt;;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... AllOf, <span class="keyword">typename</span>... NoneOf&gt;</div><div class="line"><a name="l00089"></a><span class="lineno"><a class="line" href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html#aef9fec26165b69baf8c7593fcd93327c"> 89</a></span>&#160; <span class="keyword">static</span> constexpr <span class="keyword">auto</span> <a class="code" href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html#aef9fec26165b69baf8c7593fcd93327c">group</a>(<a class="code" href="structentt_1_1exclude__t.html">exclude_t&lt;NoneOf...&gt;</a> = {}) ENTT_NOEXCEPT {</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <span class="keywordflow">return</span> <a class="code" href="structentt_1_1basic__collector.html">basic_collector&lt;matcher&lt;type_list&lt;&gt;</a>, <a class="code" href="structentt_1_1type__list.html">type_list&lt;&gt;</a>, <a class="code" href="structentt_1_1type__list.html">type_list</a>&lt;NoneOf...&gt;, AllOf...&gt;, <a class="code" href="structentt_1_1matcher.html">current_type</a>, Other...&gt;{};</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> AnyOf&gt;</div><div class="line"><a name="l00099"></a><span class="lineno"><a class="line" href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html#a29c88a0f4e74f7e93d7ae7d08326a5b5"> 99</a></span>&#160; <span class="keyword">static</span> constexpr <span class="keyword">auto</span> <a class="code" href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html#a29c88a0f4e74f7e93d7ae7d08326a5b5">replace</a>() ENTT_NOEXCEPT {</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; <span class="keywordflow">return</span> <a class="code" href="structentt_1_1basic__collector.html">basic_collector&lt;matcher&lt;type_list&lt;&gt;</a>, <a class="code" href="structentt_1_1type__list.html">type_list&lt;&gt;</a>, AnyOf&gt;, <a class="code" href="structentt_1_1matcher.html">current_type</a>, Other...&gt;{};</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; }</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... AllOf, <span class="keyword">typename</span>... NoneOf&gt;</div><div class="line"><a name="l00110"></a><span class="lineno"><a class="line" href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html#a96d7a22588a9f1f67ba805de1f027433"> 110</a></span>&#160; <span class="keyword">static</span> constexpr <span class="keyword">auto</span> <a class="code" href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html#a96d7a22588a9f1f67ba805de1f027433">where</a>(<a class="code" href="structentt_1_1exclude__t.html">exclude_t&lt;NoneOf...&gt;</a> = {}) ENTT_NOEXCEPT {</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="keyword">using</span> extended_type = <a class="code" href="structentt_1_1matcher.html">matcher</a>&lt;<a class="code" href="structentt_1_1type__list.html">type_list</a>&lt;Reject..., NoneOf...&gt;, <a class="code" href="structentt_1_1type__list.html">type_list</a>&lt;Require..., AllOf...&gt;, Rule...&gt;;</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="keywordflow">return</span> <a class="code" href="structentt_1_1basic__collector.html">basic_collector</a>&lt;extended_type, Other...&gt;{};</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; }</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;};</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;</div><div class="line"><a name="l00118"></a><span class="lineno"><a class="line" href="namespaceentt.html#aea8b073b774362fe800d9cce3542927a"> 118</a></span>&#160;constexpr <a class="code" href="structentt_1_1basic__collector_3_4.html">basic_collector&lt;&gt;</a> <a class="code" href="namespaceentt.html#aea8b073b774362fe800d9cce3542927a">collector</a>{};</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160;</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160;</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> Entity&gt;</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160;<span class="keyword">class </span><a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> {</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; <span class="keyword">using</span> payload_type = std::uint32_t;</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160;</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span>&gt;</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160; <span class="keyword">struct </span>matcher_handler;</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160;</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Reject, <span class="keyword">typename</span>... Require, <span class="keyword">typename</span> AnyOf&gt;</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160; <span class="keyword">struct </span>matcher_handler&lt;matcher&lt;type_list&lt;Reject...&gt;, type_list&lt;Require...&gt;, AnyOf&gt;&gt; {</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160; <span class="keyword">template</span>&lt;std::<span class="keywordtype">size_t</span> Index&gt;</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160; <span class="keyword">static</span> <span class="keywordtype">void</span> maybe_valid_if(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;obs, <span class="keyword">const</span> Entity <a class="code" href="namespaceentt.html">entt</a>, <span class="keyword">const</span> <a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;Entity&gt;</a> &amp;reg) {</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160; <span class="keywordflow">if</span>(reg.template has&lt;Require...&gt;(entt) &amp;&amp; !(reg.template has&lt;Reject&gt;(entt) || ...)) {</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160; <span class="keyword">auto</span> *comp = obs.view.<a class="code" href="classentt_1_1basic__storage.html#aab7da23b603d6cc78e67b3509ad979fa">try_get</a>(entt);</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160; (comp ? *comp : obs.view.<a class="code" href="classentt_1_1basic__storage.html#a4cf7d707b57b6dd63c4d7852a23b6f5e">construct</a>(entt)) |= (1 &lt;&lt; Index);</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160; }</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; }</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160;</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160; <span class="keyword">template</span>&lt;std::<span class="keywordtype">size_t</span> Index&gt;</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; <span class="keyword">static</span> <span class="keywordtype">void</span> discard_if(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;obs, <span class="keyword">const</span> Entity entt) {</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; <span class="keywordflow">if</span>(<span class="keyword">auto</span> *value = obs.view.<a class="code" href="classentt_1_1basic__storage.html#aab7da23b603d6cc78e67b3509ad979fa">try_get</a>(entt); value &amp;&amp; !(*value &amp;= (~(1 &lt;&lt; Index)))) {</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; obs.view.<a class="code" href="classentt_1_1basic__storage.html#ab59f0a70b5d25e66062e5ae5b501ab41">destroy</a>(entt);</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160; }</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160; }</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160;</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160; <span class="keyword">template</span>&lt;std::<span class="keywordtype">size_t</span> Index&gt;</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160; <span class="keyword">static</span> <span class="keywordtype">void</span> connect(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;obs, <a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;Entity&gt;</a> &amp;reg) {</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160; (reg.template on_destroy&lt;Require&gt;().<span class="keyword">template</span> connect&lt;&amp;discard_if&lt;Index&gt;&gt;(obs), ...);</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160; (reg.template on_construct&lt;Reject&gt;().<span class="keyword">template</span> connect&lt;&amp;discard_if&lt;Index&gt;&gt;(obs), ...);</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>&#160; reg.template on_replace&lt;AnyOf&gt;().<span class="keyword">template</span> connect&lt;&amp;maybe_valid_if&lt;Index&gt;&gt;(obs);</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160; reg.template on_destroy&lt;AnyOf&gt;().<span class="keyword">template</span> connect&lt;&amp;discard_if&lt;Index&gt;&gt;(obs);</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160; }</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160;</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160; <span class="keyword">static</span> <span class="keywordtype">void</span> disconnect(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;obs, <a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;Entity&gt;</a> &amp;reg) {</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160; (reg.template on_destroy&lt;Require&gt;().disconnect(obs), ...);</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160; (reg.template on_construct&lt;Reject&gt;().disconnect(obs), ...);</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160; reg.template on_replace&lt;AnyOf&gt;().disconnect(obs);</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160; reg.template on_destroy&lt;AnyOf&gt;().disconnect(obs);</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160; }</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160; };</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160;</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Reject, <span class="keyword">typename</span>... Require, <span class="keyword">typename</span>... NoneOf, <span class="keyword">typename</span>... AllOf&gt;</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>&#160; <span class="keyword">struct </span>matcher_handler&lt;matcher&lt;type_list&lt;Reject...&gt;, type_list&lt;Require...&gt;, type_list&lt;NoneOf...&gt;, AllOf...&gt;&gt; {</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160; <span class="keyword">template</span>&lt;std::<span class="keywordtype">size_t</span> Index&gt;</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160; <span class="keyword">static</span> <span class="keywordtype">void</span> maybe_valid_if(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;obs, <span class="keyword">const</span> Entity <a class="code" href="namespaceentt.html">entt</a>, <span class="keyword">const</span> <a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;Entity&gt;</a> &amp;reg) {</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>&#160; <span class="keywordflow">if</span>(reg.template has&lt;AllOf...&gt;(entt) &amp;&amp; !(reg.template has&lt;NoneOf&gt;(entt) || ...)</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160; &amp;&amp; reg.template has&lt;Require...&gt;(entt) &amp;&amp; !(reg.template has&lt;Reject&gt;(entt) || ...))</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160; {</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160; <span class="keyword">auto</span> *comp = obs.view.<a class="code" href="classentt_1_1basic__storage.html#aab7da23b603d6cc78e67b3509ad979fa">try_get</a>(entt);</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160; (comp ? *comp : obs.view.<a class="code" href="classentt_1_1basic__storage.html#a4cf7d707b57b6dd63c4d7852a23b6f5e">construct</a>(entt)) |= (1 &lt;&lt; Index);</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160; }</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>&#160; }</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>&#160;</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>&#160; <span class="keyword">template</span>&lt;std::<span class="keywordtype">size_t</span> Index&gt;</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>&#160; <span class="keyword">static</span> <span class="keywordtype">void</span> discard_if(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;obs, <span class="keyword">const</span> Entity entt) {</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>&#160; <span class="keywordflow">if</span>(<span class="keyword">auto</span> *value = obs.view.<a class="code" href="classentt_1_1basic__storage.html#aab7da23b603d6cc78e67b3509ad979fa">try_get</a>(entt); value &amp;&amp; !(*value &amp;= (~(1 &lt;&lt; Index)))) {</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>&#160; obs.view.<a class="code" href="classentt_1_1basic__storage.html#ab59f0a70b5d25e66062e5ae5b501ab41">destroy</a>(entt);</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>&#160; }</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>&#160; }</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>&#160;</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>&#160; <span class="keyword">template</span>&lt;std::<span class="keywordtype">size_t</span> Index&gt;</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>&#160; <span class="keyword">static</span> <span class="keywordtype">void</span> connect(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;obs, <a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;Entity&gt;</a> &amp;reg) {</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>&#160; (reg.template on_destroy&lt;Require&gt;().<span class="keyword">template</span> connect&lt;&amp;discard_if&lt;Index&gt;&gt;(obs), ...);</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>&#160; (reg.template on_construct&lt;Reject&gt;().<span class="keyword">template</span> connect&lt;&amp;discard_if&lt;Index&gt;&gt;(obs), ...);</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>&#160; (reg.template on_construct&lt;AllOf&gt;().<span class="keyword">template</span> connect&lt;&amp;maybe_valid_if&lt;Index&gt;&gt;(obs), ...);</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>&#160; (reg.template on_destroy&lt;NoneOf&gt;().<span class="keyword">template</span> connect&lt;&amp;maybe_valid_if&lt;Index&gt;&gt;(obs), ...);</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>&#160; (reg.template on_destroy&lt;AllOf&gt;().<span class="keyword">template</span> connect&lt;&amp;discard_if&lt;Index&gt;&gt;(obs), ...);</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>&#160; (reg.template on_construct&lt;NoneOf&gt;().<span class="keyword">template</span> connect&lt;&amp;discard_if&lt;Index&gt;&gt;(obs), ...);</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>&#160; }</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>&#160;</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>&#160; <span class="keyword">static</span> <span class="keywordtype">void</span> disconnect(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;obs, <a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;Entity&gt;</a> &amp;reg) {</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>&#160; (reg.template on_destroy&lt;Require&gt;().disconnect(obs), ...);</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>&#160; (reg.template on_construct&lt;Reject&gt;().disconnect(obs), ...);</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>&#160; (reg.template on_construct&lt;AllOf&gt;().disconnect(obs), ...);</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>&#160; (reg.template on_destroy&lt;NoneOf&gt;().disconnect(obs), ...);</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>&#160; (reg.template on_destroy&lt;AllOf&gt;().disconnect(obs), ...);</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>&#160; (reg.template on_construct&lt;NoneOf&gt;().disconnect(obs), ...);</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>&#160; }</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>&#160; };</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>&#160;</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Matcher&gt;</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>&#160; <span class="keyword">static</span> <span class="keywordtype">void</span> disconnect(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;obs, <a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;Entity&gt;</a> &amp;reg) {</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>&#160; (matcher_handler&lt;Matcher&gt;::disconnect(obs, reg), ...);</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>&#160; }</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>&#160;</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Matcher, std::size_t... Index&gt;</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>&#160; <span class="keywordtype">void</span> connect(<a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;Entity&gt;</a> &amp;reg, std::index_sequence&lt;Index...&gt;) {</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>&#160; static_assert(<span class="keyword">sizeof</span>...(Matcher) &lt; std::numeric_limits&lt;payload_type&gt;::digits);</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>&#160; (matcher_handler&lt;Matcher&gt;::template connect&lt;Index&gt;(*<span class="keyword">this</span>, reg), ...);</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>&#160; release = &amp;<a class="code" href="classentt_1_1basic__observer.html#a1337e8f885ca963383e5a3ed2a354955">basic_observer::disconnect</a>&lt;Matcher...&gt;;</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>&#160; }</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>&#160;</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00263"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#af7a57f53ed7a6c835129480ff6594f7d"> 263</a></span>&#160; <span class="keyword">using</span> <a class="code" href="classentt_1_1basic__observer.html#af7a57f53ed7a6c835129480ff6594f7d">entity_type</a> = Entity;</div><div class="line"><a name="l00265"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a147a0e35035fc3c19b67b31d66d2d80b"> 265</a></span>&#160; <span class="keyword">using</span> <a class="code" href="classentt_1_1basic__observer.html#a147a0e35035fc3c19b67b31d66d2d80b">size_type</a> = std::size_t;</div><div class="line"><a name="l00267"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a7954b77084292847aa1c8da9f22d8443"> 267</a></span>&#160; <span class="keyword">using</span> <a class="code" href="classentt_1_1basic__observer.html#a7954b77084292847aa1c8da9f22d8443">iterator_type</a> = <span class="keyword">typename</span> <a class="code" href="classentt_1_1sparse__set.html#a580b210d5a24c49ca8c255646f3bb469">sparse_set&lt;Entity&gt;::iterator_type</a>;</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>&#160;</div><div class="line"><a name="l00270"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a31d9929b1c6d0b422ecbccff86803d3c"> 270</a></span>&#160; <a class="code" href="classentt_1_1basic__observer.html#a31d9929b1c6d0b422ecbccff86803d3c">basic_observer</a>() ENTT_NOEXCEPT</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>&#160; : target{}, release{}, <a class="code" href="classentt_1_1basic__view.html">view</a>{}</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>&#160; {}</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>&#160;</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>&#160; <a class="code" href="classentt_1_1basic__observer.html">basic_observer</a>(<span class="keyword">const</span> <a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>&#160; <a class="code" href="classentt_1_1basic__observer.html">basic_observer</a>(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;&amp;) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>&#160;</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Matcher&gt;</div><div class="line"><a name="l00285"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a2290c465994e6af15f1fe7b35541ffbd"> 285</a></span>&#160; <a class="code" href="classentt_1_1basic__observer.html#a2290c465994e6af15f1fe7b35541ffbd">basic_observer</a>(<a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;entity_type&gt;</a> &amp;reg, <a class="code" href="structentt_1_1basic__collector.html">basic_collector&lt;Matcher...&gt;</a>) ENTT_NOEXCEPT</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>&#160; : target{&amp;reg},</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>&#160; release{},</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>&#160; <a class="code" href="classentt_1_1basic__view.html">view</a>{}</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>&#160; {</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>&#160; connect&lt;Matcher...&gt;(reg, std::index_sequence_for&lt;Matcher...&gt;{});</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>&#160; }</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>&#160;</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>&#160; ~<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a>() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>&#160;</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>&#160; <a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp; operator=(<span class="keyword">const</span> <a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>&#160;</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>&#160; <a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp; operator=(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;&amp;) = <span class="keyword">delete</span>;</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>&#160;</div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Matcher&gt;</div><div class="line"><a name="l00314"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a7d69a8bc866b01cc677de492bc436209"> 314</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classentt_1_1basic__observer.html#a7d69a8bc866b01cc677de492bc436209">connect</a>(<a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;entity_type&gt;</a> &amp;reg, <a class="code" href="structentt_1_1basic__collector.html">basic_collector&lt;Matcher...&gt;</a>) {</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>&#160; disconnect();</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>&#160; connect&lt;Matcher...&gt;(reg, std::index_sequence_for&lt;Matcher...&gt;{});</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span>&#160; target = &amp;reg;</div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span>&#160; <a class="code" href="classentt_1_1basic__view.html">view</a>.reset();</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span>&#160; }</div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span>&#160;</div><div class="line"><a name="l00322"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a1337e8f885ca963383e5a3ed2a354955"> 322</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classentt_1_1basic__observer.html#a1337e8f885ca963383e5a3ed2a354955">disconnect</a>() {</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span>&#160; <span class="keywordflow">if</span>(release) {</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>&#160; release(*<span class="keyword">this</span>, *target);</div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>&#160; release = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>&#160; }</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>&#160; }</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>&#160;</div><div class="line"><a name="l00333"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#ab42aeb1e1ffb32b98bc4da4f30755ec1"> 333</a></span>&#160; <a class="code" href="classentt_1_1basic__observer.html#a147a0e35035fc3c19b67b31d66d2d80b">size_type</a> <a class="code" href="classentt_1_1basic__observer.html#ab42aeb1e1ffb32b98bc4da4f30755ec1">size</a>() const ENTT_NOEXCEPT {</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classentt_1_1basic__view.html">view</a>.size();</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>&#160; }</div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>&#160;</div><div class="line"><a name="l00341"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a0986b7af08f9b1bc70bd01b9bbe66cc4"> 341</a></span>&#160; <span class="keywordtype">bool</span> <a class="code" href="classentt_1_1basic__observer.html#a0986b7af08f9b1bc70bd01b9bbe66cc4">empty</a>() const ENTT_NOEXCEPT {</div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classentt_1_1basic__view.html">view</a>.empty();</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>&#160; }</div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>&#160;</div><div class="line"><a name="l00357"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a435ebcce2d35f39b9f19ad84ffcdb4ea"> 357</a></span>&#160; <span class="keyword">const</span> <a class="code" href="classentt_1_1basic__observer.html#af7a57f53ed7a6c835129480ff6594f7d">entity_type</a> * <a class="code" href="classentt_1_1basic__observer.html#a435ebcce2d35f39b9f19ad84ffcdb4ea">data</a>() const ENTT_NOEXCEPT {</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classentt_1_1basic__view.html">view</a>.data();</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>&#160; }</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>&#160;</div><div class="line"><a name="l00369"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a33bca86113be57e75ca1da80620763d1"> 369</a></span>&#160; <a class="code" href="classentt_1_1basic__observer.html#a7954b77084292847aa1c8da9f22d8443">iterator_type</a> <a class="code" href="classentt_1_1basic__observer.html#a33bca86113be57e75ca1da80620763d1">begin</a>() const ENTT_NOEXCEPT {</div><div class="line"><a name="l00370"></a><span class="lineno"> 370</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classentt_1_1basic__view.html">view</a>.sparse_set&lt;entity_type&gt;::begin();</div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>&#160; }</div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>&#160;</div><div class="line"><a name="l00383"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#afe16c233c8795aa7341d61cf86c1d2d7"> 383</a></span>&#160; <a class="code" href="classentt_1_1basic__observer.html#a7954b77084292847aa1c8da9f22d8443">iterator_type</a> <a class="code" href="classentt_1_1basic__observer.html#afe16c233c8795aa7341d61cf86c1d2d7">end</a>() const ENTT_NOEXCEPT {</div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classentt_1_1basic__view.html">view</a>.sparse_set&lt;entity_type&gt;::end();</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span>&#160; }</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span>&#160;</div><div class="line"><a name="l00388"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#ade730cb09309ed7077616a908b25c2e7"> 388</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classentt_1_1basic__observer.html#ade730cb09309ed7077616a908b25c2e7">clear</a>() {</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span>&#160; <a class="code" href="classentt_1_1basic__view.html">view</a>.reset();</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span>&#160; }</div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span>&#160;</div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Func&gt;</div><div class="line"><a name="l00407"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a181a6724835a3a41e33610003f738525"> 407</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classentt_1_1basic__observer.html#a181a6724835a3a41e33610003f738525">each</a>(Func func)<span class="keyword"> const </span>{</div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>&#160; static_assert(std::is_invocable_v&lt;Func, entity_type&gt;);</div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span>&#160; std::for_each(begin(), end(), std::move(func));</div><div class="line"><a name="l00410"></a><span class="lineno"> 410</span>&#160; }</div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span>&#160;</div><div class="line"><a name="l00426"></a><span class="lineno"> 426</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Func&gt;</div><div class="line"><a name="l00427"></a><span class="lineno"><a class="line" href="classentt_1_1basic__observer.html#a535f3ddf32641a54e1c8861519933c97"> 427</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classentt_1_1basic__observer.html#a535f3ddf32641a54e1c8861519933c97">each</a>(Func func) {</div><div class="line"><a name="l00428"></a><span class="lineno"> 428</span>&#160; std::as_const(*this).each(std::move(func));</div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span>&#160; clear();</div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span>&#160; }</div><div class="line"><a name="l00431"></a><span class="lineno"> 431</span>&#160;</div><div class="line"><a name="l00432"></a><span class="lineno"> 432</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00433"></a><span class="lineno"> 433</span>&#160; <a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;entity_type&gt;</a> *target;</div><div class="line"><a name="l00434"></a><span class="lineno"> 434</span>&#160; void(* release)(<a class="code" href="classentt_1_1basic__observer.html">basic_observer</a> &amp;, <a class="code" href="classentt_1_1basic__registry.html">basic_registry&lt;entity_type&gt;</a> &amp;);</div><div class="line"><a name="l00435"></a><span class="lineno"> 435</span>&#160; <a class="code" href="structentt_1_1storage.html">storage&lt;entity_type, payload_type&gt;</a> <a class="code" href="namespaceentt.html#af2118c00dea16193aee017d1408beb53">view</a>;</div><div class="line"><a name="l00436"></a><span class="lineno"> 436</span>&#160;};</div><div class="line"><a name="l00437"></a><span class="lineno"> 437</span>&#160;</div><div class="line"><a name="l00438"></a><span class="lineno"> 438</span>&#160;</div><div class="line"><a name="l00439"></a><span class="lineno"> 439</span>&#160;}</div><div class="line"><a name="l00440"></a><span class="lineno"> 440</span>&#160;</div><div class="line"><a name="l00441"></a><span class="lineno"> 441</span>&#160;</div><div class="line"><a name="l00442"></a><span class="lineno"> 442</span>&#160;<span class="preprocessor">#endif // ENTT_ENTITY_OBSERVER_HPP</span></div><div class="ttc" id="classentt_1_1basic__observer_html_a33bca86113be57e75ca1da80620763d1"><div class="ttname"><a href="classentt_1_1basic__observer.html#a33bca86113be57e75ca1da80620763d1">entt::basic_observer::begin</a></div><div class="ttdeci">iterator_type begin() const ENTT_NOEXCEPT</div><div class="ttdoc">Returns an iterator to the first entity of the observer. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00369">observer.hpp:369</a></div></div>
<div class="ttc" id="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb_html_aef9fec26165b69baf8c7593fcd93327c"><div class="ttname"><a href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html#aef9fec26165b69baf8c7593fcd93327c">entt::basic_collector&lt; matcher&lt; type_list&lt; Reject... &gt;, type_list&lt; Require... &gt;, Rule... &gt;, Other... &gt;::group</a></div><div class="ttdeci">static constexpr auto group(exclude_t&lt; NoneOf... &gt;={}) ENTT_NOEXCEPT</div><div class="ttdoc">Adds a grouping matcher to the collector. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00089">observer.hpp:89</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_a31d9929b1c6d0b422ecbccff86803d3c"><div class="ttname"><a href="classentt_1_1basic__observer.html#a31d9929b1c6d0b422ecbccff86803d3c">entt::basic_observer::basic_observer</a></div><div class="ttdeci">basic_observer() ENTT_NOEXCEPT</div><div class="ttdoc">Default constructor. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00270">observer.hpp:270</a></div></div>
<div class="ttc" id="structentt_1_1basic__collector_3_4_html"><div class="ttname"><a href="structentt_1_1basic__collector_3_4.html">entt::basic_collector&lt;&gt;</a></div><div class="ttdoc">Collector. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00046">observer.hpp:46</a></div></div>
<div class="ttc" id="classentt_1_1basic__storage_html_aab7da23b603d6cc78e67b3509ad979fa"><div class="ttname"><a href="classentt_1_1basic__storage.html#aab7da23b603d6cc78e67b3509ad979fa">entt::basic_storage::try_get</a></div><div class="ttdeci">const object_type * try_get(const entity_type entt) const ENTT_NOEXCEPT</div><div class="ttdoc">Returns a pointer to the object associated with an entity, if any. </div><div class="ttdef"><b>Definition:</b> <a href="storage_8hpp_source.html#l00294">storage.hpp:294</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_a1337e8f885ca963383e5a3ed2a354955"><div class="ttname"><a href="classentt_1_1basic__observer.html#a1337e8f885ca963383e5a3ed2a354955">entt::basic_observer::disconnect</a></div><div class="ttdeci">void disconnect()</div><div class="ttdoc">Disconnects an observer from the registry it keeps track of. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00322">observer.hpp:322</a></div></div>
<div class="ttc" id="classentt_1_1basic__storage_html_a4cf7d707b57b6dd63c4d7852a23b6f5e"><div class="ttname"><a href="classentt_1_1basic__storage.html#a4cf7d707b57b6dd63c4d7852a23b6f5e">entt::basic_storage::construct</a></div><div class="ttdeci">object_type &amp; construct(const entity_type entt, Args &amp;&amp;... args)</div><div class="ttdoc">Assigns an entity to a storage and constructs its object. </div><div class="ttdef"><b>Definition:</b> <a href="storage_8hpp_source.html#l00322">storage.hpp:322</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_a0986b7af08f9b1bc70bd01b9bbe66cc4"><div class="ttname"><a href="classentt_1_1basic__observer.html#a0986b7af08f9b1bc70bd01b9bbe66cc4">entt::basic_observer::empty</a></div><div class="ttdeci">bool empty() const ENTT_NOEXCEPT</div><div class="ttdoc">Checks whether an observer is empty. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00341">observer.hpp:341</a></div></div>
<div class="ttc" id="structentt_1_1matcher_html"><div class="ttname"><a href="structentt_1_1matcher.html">entt::matcher</a></div><div class="ttdoc">Grouping matcher. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00024">observer.hpp:24</a></div></div>
<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#l00012">algorithm.hpp:12</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_a7954b77084292847aa1c8da9f22d8443"><div class="ttname"><a href="classentt_1_1basic__observer.html#a7954b77084292847aa1c8da9f22d8443">entt::basic_observer::iterator_type</a></div><div class="ttdeci">typename sparse_set&lt; Entity &gt;::iterator_type iterator_type</div><div class="ttdoc">Input iterator type. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00267">observer.hpp:267</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_afe16c233c8795aa7341d61cf86c1d2d7"><div class="ttname"><a href="classentt_1_1basic__observer.html#afe16c233c8795aa7341d61cf86c1d2d7">entt::basic_observer::end</a></div><div class="ttdeci">iterator_type end() const ENTT_NOEXCEPT</div><div class="ttdoc">Returns an iterator that is past the last entity of the observer. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00383">observer.hpp:383</a></div></div>
<div class="ttc" id="structentt_1_1storage_html"><div class="ttname"><a href="structentt_1_1storage.html">entt::storage&lt; entity_type, payload_type &gt;</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_a535f3ddf32641a54e1c8861519933c97"><div class="ttname"><a href="classentt_1_1basic__observer.html#a535f3ddf32641a54e1c8861519933c97">entt::basic_observer::each</a></div><div class="ttdeci">void each(Func func)</div><div class="ttdoc">Iterates entities and applies the given function object to them, then clears the observer. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00427">observer.hpp:427</a></div></div>
<div class="ttc" id="namespaceentt_html_aea8b073b774362fe800d9cce3542927a"><div class="ttname"><a href="namespaceentt.html#aea8b073b774362fe800d9cce3542927a">entt::collector</a></div><div class="ttdeci">constexpr basic_collector collector</div><div class="ttdoc">Variable template used to ease the definition of collectors. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00118">observer.hpp:118</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_a435ebcce2d35f39b9f19ad84ffcdb4ea"><div class="ttname"><a href="classentt_1_1basic__observer.html#a435ebcce2d35f39b9f19ad84ffcdb4ea">entt::basic_observer::data</a></div><div class="ttdeci">const entity_type * data() const ENTT_NOEXCEPT</div><div class="ttdoc">Direct access to the list of entities of the observer. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00357">observer.hpp:357</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_af7a57f53ed7a6c835129480ff6594f7d"><div class="ttname"><a href="classentt_1_1basic__observer.html#af7a57f53ed7a6c835129480ff6594f7d">entt::basic_observer::entity_type</a></div><div class="ttdeci">Entity entity_type</div><div class="ttdoc">Underlying entity identifier. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00263">observer.hpp:263</a></div></div>
<div class="ttc" id="classentt_1_1basic__registry_html"><div class="ttname"><a href="classentt_1_1basic__registry.html">entt::basic_registry</a></div><div class="ttdoc">Fast and reliable entity-component system. </div><div class="ttdef"><b>Definition:</b> <a href="entity_2fwd_8hpp_source.html#l00013">fwd.hpp:13</a></div></div>
<div class="ttc" id="classentt_1_1basic__view_html"><div class="ttname"><a href="classentt_1_1basic__view.html">entt::basic_view</a></div><div class="ttdoc">View. </div><div class="ttdef"><b>Definition:</b> <a href="entity_2fwd_8hpp_source.html#l00017">fwd.hpp:17</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_a2290c465994e6af15f1fe7b35541ffbd"><div class="ttname"><a href="classentt_1_1basic__observer.html#a2290c465994e6af15f1fe7b35541ffbd">entt::basic_observer::basic_observer</a></div><div class="ttdeci">basic_observer(basic_registry&lt; entity_type &gt; &amp;reg, basic_collector&lt; Matcher... &gt;) ENTT_NOEXCEPT</div><div class="ttdoc">Creates an observer and connects it to a given registry. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00285">observer.hpp:285</a></div></div>
<div class="ttc" id="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb_html_a96d7a22588a9f1f67ba805de1f027433"><div class="ttname"><a href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html#a96d7a22588a9f1f67ba805de1f027433">entt::basic_collector&lt; matcher&lt; type_list&lt; Reject... &gt;, type_list&lt; Require... &gt;, Rule... &gt;, Other... &gt;::where</a></div><div class="ttdeci">static constexpr auto where(exclude_t&lt; NoneOf... &gt;={}) ENTT_NOEXCEPT</div><div class="ttdoc">Updates the filter of the last added matcher. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00110">observer.hpp:110</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_ade730cb09309ed7077616a908b25c2e7"><div class="ttname"><a href="classentt_1_1basic__observer.html#ade730cb09309ed7077616a908b25c2e7">entt::basic_observer::clear</a></div><div class="ttdeci">void clear()</div><div class="ttdoc">Resets the underlying container. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00388">observer.hpp:388</a></div></div>
<div class="ttc" id="structentt_1_1basic__collector_html"><div class="ttname"><a href="structentt_1_1basic__collector.html">entt::basic_collector</a></div><div class="ttdoc">Collector. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00034">observer.hpp:34</a></div></div>
<div class="ttc" id="structentt_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="type__traits_8hpp_source.html#l00042">type_traits.hpp:42</a></div></div>
<div class="ttc" id="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb_html_a29c88a0f4e74f7e93d7ae7d08326a5b5"><div class="ttname"><a href="structentt_1_1basic__collector_3_01matcher_3_01type__list_3_01Reject_8_8_8_01_4_00_01type__list_98a79514dcad34a82f321f0796064ffb.html#a29c88a0f4e74f7e93d7ae7d08326a5b5">entt::basic_collector&lt; matcher&lt; type_list&lt; Reject... &gt;, type_list&lt; Require... &gt;, Rule... &gt;, Other... &gt;::replace</a></div><div class="ttdeci">static constexpr auto replace() ENTT_NOEXCEPT</div><div class="ttdoc">Adds an observing matcher to the collector. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00099">observer.hpp:99</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_a7d69a8bc866b01cc677de492bc436209"><div class="ttname"><a href="classentt_1_1basic__observer.html#a7d69a8bc866b01cc677de492bc436209">entt::basic_observer::connect</a></div><div class="ttdeci">void connect(basic_registry&lt; entity_type &gt; &amp;reg, basic_collector&lt; Matcher... &gt;)</div><div class="ttdoc">Connects an observer to a given registry. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00314">observer.hpp:314</a></div></div>
<div class="ttc" id="structentt_1_1basic__collector_3_4_html_a634ac3a53ee686d7fb7121404b14c17e"><div class="ttname"><a href="structentt_1_1basic__collector_3_4.html#a634ac3a53ee686d7fb7121404b14c17e">entt::basic_collector&lt;&gt;::replace</a></div><div class="ttdeci">static constexpr auto replace() ENTT_NOEXCEPT</div><div class="ttdoc">Adds an observing matcher to the collector. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00064">observer.hpp:64</a></div></div>
<div class="ttc" id="structentt_1_1exclude__t_html"><div class="ttname"><a href="structentt_1_1exclude__t.html">entt::exclude_t</a></div><div class="ttdoc">Alias for exclusion lists. </div><div class="ttdef"><b>Definition:</b> <a href="entity_2utility_8hpp_source.html#l00016">utility.hpp:16</a></div></div>
<div class="ttc" id="structentt_1_1basic__collector_3_4_html_a0d5a3c7d8d96f79585930f93939136f0"><div class="ttname"><a href="structentt_1_1basic__collector_3_4.html#a0d5a3c7d8d96f79585930f93939136f0">entt::basic_collector&lt;&gt;::group</a></div><div class="ttdeci">static constexpr auto group(exclude_t&lt; NoneOf... &gt;={}) ENTT_NOEXCEPT</div><div class="ttdoc">Adds a grouping matcher to the collector. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00054">observer.hpp:54</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_a147a0e35035fc3c19b67b31d66d2d80b"><div class="ttname"><a href="classentt_1_1basic__observer.html#a147a0e35035fc3c19b67b31d66d2d80b">entt::basic_observer::size_type</a></div><div class="ttdeci">std::size_t size_type</div><div class="ttdoc">Unsigned integer type. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00265">observer.hpp:265</a></div></div>
<div class="ttc" id="namespaceentt_html_af2118c00dea16193aee017d1408beb53"><div class="ttname"><a href="namespaceentt.html#af2118c00dea16193aee017d1408beb53">entt::view</a></div><div class="ttdeci">basic_view&lt; entity, Types... &gt; view</div><div class="ttdoc">Alias declaration for the most common use case. </div><div class="ttdef"><b>Definition:</b> <a href="entity_2fwd_8hpp_source.html#l00076">fwd.hpp:76</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_a181a6724835a3a41e33610003f738525"><div class="ttname"><a href="classentt_1_1basic__observer.html#a181a6724835a3a41e33610003f738525">entt::basic_observer::each</a></div><div class="ttdeci">void each(Func func) const</div><div class="ttdoc">Iterates entities and applies the given function object to them, then clears the observer. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00407">observer.hpp:407</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html_ab42aeb1e1ffb32b98bc4da4f30755ec1"><div class="ttname"><a href="classentt_1_1basic__observer.html#ab42aeb1e1ffb32b98bc4da4f30755ec1">entt::basic_observer::size</a></div><div class="ttdeci">size_type size() const ENTT_NOEXCEPT</div><div class="ttdoc">Returns the number of elements in an observer. </div><div class="ttdef"><b>Definition:</b> <a href="observer_8hpp_source.html#l00333">observer.hpp:333</a></div></div>
<div class="ttc" id="classentt_1_1basic__observer_html"><div class="ttname"><a href="classentt_1_1basic__observer.html">entt::basic_observer</a></div><div class="ttdoc">Observer. </div><div class="ttdef"><b>Definition:</b> <a href="entity_2fwd_8hpp_source.html#l00029">fwd.hpp:29</a></div></div>
<div class="ttc" id="classentt_1_1basic__storage_html_ab59f0a70b5d25e66062e5ae5b501ab41"><div class="ttname"><a href="classentt_1_1basic__storage.html#ab59f0a70b5d25e66062e5ae5b501ab41">entt::basic_storage::destroy</a></div><div class="ttdeci">void destroy(const entity_type entt)</div><div class="ttdoc">Removes an entity from a storage and destroys its object. </div><div class="ttdef"><b>Definition:</b> <a href="storage_8hpp_source.html#l00379">storage.hpp:379</a></div></div>
<div class="ttc" id="classentt_1_1sparse__set_html_a580b210d5a24c49ca8c255646f3bb469"><div class="ttname"><a href="classentt_1_1sparse__set.html#a580b210d5a24c49ca8c255646f3bb469">entt::sparse_set::iterator_type</a></div><div class="ttdeci">iterator iterator_type</div><div class="ttdoc">Random access iterator type. </div><div class="ttdef"><b>Definition:</b> <a href="sparse__set_8hpp_source.html#l00182">sparse_set.hpp:182</a></div></div>
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