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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Gamedev Framework (gf): BlockAllocator.h Source File</title>
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<div id="projectname">Gamedev Framework (gf)<span id="projectnumber"> 0.21.0</span>
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<div id="projectbrief">A C++17 framework for 2D games</div>
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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_6d069d519ae9d12fa11dd8e685586b60.html">gf</a></li> </ul>
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<div class="headertitle"><div class="title">BlockAllocator.h</div></div>
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<div class="contents">
<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> * Gamedev Framework (gf)</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * Copyright (C) 2016-2021 Julien Bernard</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> *</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> * This software is provided 'as-is', without any express or implied</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> * warranty. In no event will the authors be held liable for any damages</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> * arising from the use of this software.</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"> * Permission is granted to anyone to use this software for any purpose,</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> * including commercial applications, and to alter it and redistribute it</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> * freely, subject to the following restrictions:</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> *</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> * 1. The origin of this software must not be misrepresented; you must not</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> * claim that you wrote the original software. If you use this software</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> * in a product, an acknowledgment in the product documentation would be</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"> * appreciated but is not required.</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment"> * 2. Altered source versions must be plainly marked as such, and must not be</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment"> * misrepresented as being the original software.</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment"> * 3. This notice may not be removed or altered from any source distribution.</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment"> */</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#ifndef GF_SPATIAL_BLOCK_ALLOCATOR_H</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#define GF_SPATIAL_BLOCK_ALLOCATOR_H</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include <cassert></span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#include <vector></span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacegf.html">gf</a> {</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#ifndef DOXYGEN_SHOULD_SKIP_THIS</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="keyword">inline</span> <span class="keyword">namespace </span>v1 {</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"><a class="line" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5"> 38</a></span> <span class="keyword">constexpr</span> std::size_t <a class="code hl_variable" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">NullIndex</a> = <span class="keyword">static_cast<</span>std::size_t<span class="keyword">></span>(-1);</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> </div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="keyword">template</span><<span class="keyword">typename</span> T></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"><a class="line" href="classgf_1_1_block_allocator.html"> 45</a></span> <span class="keyword">class </span><a class="code hl_class" href="classgf_1_1_block_allocator.html">BlockAllocator</a> {</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keyword">public</span>:</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"><a class="line" href="classgf_1_1_block_allocator.html#abc85f0d20f6da740299369b2f656717a"> 50</a></span> <a class="code hl_function" href="classgf_1_1_block_allocator.html#abc85f0d20f6da740299369b2f656717a">BlockAllocator</a>()</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> : m_firstFreeBlock(<a class="code hl_variable" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">NullIndex</a>)</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> , m_allocated(0)</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> {</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> }</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"><a class="line" href="classgf_1_1_block_allocator.html#a02c4f6e958c5d29fb4fb1e036f34a74e"> 61</a></span> std::size_t <a class="code hl_function" href="classgf_1_1_block_allocator.html#a02c4f6e958c5d29fb4fb1e036f34a74e">allocate</a>() {</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> std::size_t index = <a class="code hl_variable" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">NullIndex</a>;</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> </div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="keywordflow">if</span> (m_firstFreeBlock != <a class="code hl_variable" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">NullIndex</a>) {</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> index = m_firstFreeBlock;</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> m_firstFreeBlock = m_blocks[index].next;</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> m_blocks[index].next = <a class="code hl_variable" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">NullIndex</a>;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> index = m_blocks.size();</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> m_blocks.push_back(<a class="code hl_enumvalue" href="group__net__sockets.html#ggad2a84f7b35acd2f97d8f97f5621fca10ae1e4c8c9ccd9fc39c391da4bcd093fb2">Block</a>());</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> }</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> assert(index < m_blocks.size());</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> assert(m_blocks[index].next == <a class="code hl_variable" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">NullIndex</a>);</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> </div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> ++m_allocated;</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="keywordflow">return</span> index;</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> }</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"><a class="line" href="classgf_1_1_block_allocator.html#a183dd29c1a76ae0ea29fd6ad99db3123"> 87</a></span> <span class="keywordtype">void</span> <a class="code hl_function" href="classgf_1_1_block_allocator.html#a183dd29c1a76ae0ea29fd6ad99db3123">dispose</a>(std::size_t index) {</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> assert(index < m_blocks.size());</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> m_blocks[index].next = m_firstFreeBlock;</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> m_firstFreeBlock = index;</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> --m_allocated;</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> }</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> </div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"><a class="line" href="classgf_1_1_block_allocator.html#a824b0f2d3f4ffc989752946c46657735"> 99</a></span> <a class="code hl_enumvalue" href="group__graphics__devices.html#gga795d7d5e2f2a4f38b16b95e0e78cb626ab9ece18c950afbfa6b0fdbfa4ff731d3">T</a>& <a class="code hl_function" href="classgf_1_1_block_allocator.html#a824b0f2d3f4ffc989752946c46657735">operator[]</a>(std::size_t index) {</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> assert(index < m_blocks.size());</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> assert(m_blocks[index].next == <a class="code hl_variable" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">NullIndex</a>);</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> <span class="keywordflow">return</span> m_blocks[index].data;</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> }</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> </div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"><a class="line" href="classgf_1_1_block_allocator.html#ac456b449dcc30093131e4ed58a8470a6"> 110</a></span> <span class="keyword">const</span> <a class="code hl_enumvalue" href="group__graphics__devices.html#gga795d7d5e2f2a4f38b16b95e0e78cb626ab9ece18c950afbfa6b0fdbfa4ff731d3">T</a>& <a class="code hl_function" href="classgf_1_1_block_allocator.html#ac456b449dcc30093131e4ed58a8470a6">operator[]</a>(std::size_t index)<span class="keyword"> const </span>{</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> assert(index < m_blocks.size());</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> assert(m_blocks[index].next == <a class="code hl_variable" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">NullIndex</a>);</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> <span class="keywordflow">return</span> m_blocks[index].data;</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> }</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> </div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"><a class="line" href="classgf_1_1_block_allocator.html#aa25924f50d599df703f91543fc58a662"> 119</a></span> <span class="keywordtype">void</span> <a class="code hl_function" href="classgf_1_1_block_allocator.html#aa25924f50d599df703f91543fc58a662">clear</a>() {</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> m_firstFreeBlock = <a class="code hl_variable" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">NullIndex</a>;</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> m_blocks.clear();</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> }</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> </div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"><a class="line" href="classgf_1_1_block_allocator.html#a41f29430529e4efe74893afae993f7ec"> 129</a></span> std::size_t <a class="code hl_function" href="classgf_1_1_block_allocator.html#a41f29430529e4efe74893afae993f7ec">getAllocated</a>()<span class="keyword"> const </span>{</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="keywordflow">return</span> m_allocated;</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> }</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> </div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> <span class="keyword">private</span>:</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> <span class="keyword">struct </span><a class="code hl_enumvalue" href="group__net__sockets.html#ggad2a84f7b35acd2f97d8f97f5621fca10ae1e4c8c9ccd9fc39c391da4bcd093fb2">Block</a> {</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <a class="code hl_enumvalue" href="group__graphics__devices.html#gga795d7d5e2f2a4f38b16b95e0e78cb626ab9ece18c950afbfa6b0fdbfa4ff731d3">T</a> data;</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> std::size_t next = <a class="code hl_variable" href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">NullIndex</a>;</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> };</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> </div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> std::size_t m_firstFreeBlock;</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> std::vector<Block> m_blocks;</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> std::size_t m_allocated;</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> };</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> </div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> </div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span><span class="preprocessor">#ifndef DOXYGEN_SHOULD_SKIP_THIS</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span>}</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span>}</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> </div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> </div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span><span class="preprocessor">#endif </span><span class="comment">// GF_SPATIAL_BLOCK_ALLOCATOR_H</span></div>
<div class="ttc" id="aclassgf_1_1_block_allocator_html"><div class="ttname"><a href="classgf_1_1_block_allocator.html">gf::BlockAllocator</a></div><div class="ttdoc">An allocator of objects referenced by an index.</div><div class="ttdef"><b>Definition:</b> BlockAllocator.h:45</div></div>
<div class="ttc" id="aclassgf_1_1_block_allocator_html_a02c4f6e958c5d29fb4fb1e036f34a74e"><div class="ttname"><a href="classgf_1_1_block_allocator.html#a02c4f6e958c5d29fb4fb1e036f34a74e">gf::BlockAllocator::allocate</a></div><div class="ttdeci">std::size_t allocate()</div><div class="ttdoc">Allocate an object.</div><div class="ttdef"><b>Definition:</b> BlockAllocator.h:61</div></div>
<div class="ttc" id="aclassgf_1_1_block_allocator_html_a183dd29c1a76ae0ea29fd6ad99db3123"><div class="ttname"><a href="classgf_1_1_block_allocator.html#a183dd29c1a76ae0ea29fd6ad99db3123">gf::BlockAllocator::dispose</a></div><div class="ttdeci">void dispose(std::size_t index)</div><div class="ttdoc">Deallocate the object at the given index.</div><div class="ttdef"><b>Definition:</b> BlockAllocator.h:87</div></div>
<div class="ttc" id="aclassgf_1_1_block_allocator_html_a41f29430529e4efe74893afae993f7ec"><div class="ttname"><a href="classgf_1_1_block_allocator.html#a41f29430529e4efe74893afae993f7ec">gf::BlockAllocator::getAllocated</a></div><div class="ttdeci">std::size_t getAllocated() const</div><div class="ttdoc">Get the number of allocated objects.</div><div class="ttdef"><b>Definition:</b> BlockAllocator.h:129</div></div>
<div class="ttc" id="aclassgf_1_1_block_allocator_html_a824b0f2d3f4ffc989752946c46657735"><div class="ttname"><a href="classgf_1_1_block_allocator.html#a824b0f2d3f4ffc989752946c46657735">gf::BlockAllocator::operator[]</a></div><div class="ttdeci">T & operator[](std::size_t index)</div><div class="ttdoc">Access the object at a given index.</div><div class="ttdef"><b>Definition:</b> BlockAllocator.h:99</div></div>
<div class="ttc" id="aclassgf_1_1_block_allocator_html_aa25924f50d599df703f91543fc58a662"><div class="ttname"><a href="classgf_1_1_block_allocator.html#aa25924f50d599df703f91543fc58a662">gf::BlockAllocator::clear</a></div><div class="ttdeci">void clear()</div><div class="ttdoc">Remove all objects at once.</div><div class="ttdef"><b>Definition:</b> BlockAllocator.h:119</div></div>
<div class="ttc" id="aclassgf_1_1_block_allocator_html_abc85f0d20f6da740299369b2f656717a"><div class="ttname"><a href="classgf_1_1_block_allocator.html#abc85f0d20f6da740299369b2f656717a">gf::BlockAllocator::BlockAllocator</a></div><div class="ttdeci">BlockAllocator()</div><div class="ttdoc">Default constructor.</div><div class="ttdef"><b>Definition:</b> BlockAllocator.h:50</div></div>
<div class="ttc" id="aclassgf_1_1_block_allocator_html_ac456b449dcc30093131e4ed58a8470a6"><div class="ttname"><a href="classgf_1_1_block_allocator.html#ac456b449dcc30093131e4ed58a8470a6">gf::BlockAllocator::operator[]</a></div><div class="ttdeci">const T & operator[](std::size_t index) const</div><div class="ttdoc">Access the object at a given index.</div><div class="ttdef"><b>Definition:</b> BlockAllocator.h:110</div></div>
<div class="ttc" id="agroup__core__container_html_ga2f9de3b198236fc42a249e43adc7fac5"><div class="ttname"><a href="group__core__container.html#ga2f9de3b198236fc42a249e43adc7fac5">gf::NullIndex</a></div><div class="ttdeci">constexpr std::size_t NullIndex</div><div class="ttdoc">A null index in a block allocator.</div><div class="ttdef"><b>Definition:</b> BlockAllocator.h:38</div></div>
<div class="ttc" id="agroup__graphics__devices_html_gga795d7d5e2f2a4f38b16b95e0e78cb626ab9ece18c950afbfa6b0fdbfa4ff731d3"><div class="ttname"><a href="group__graphics__devices.html#gga795d7d5e2f2a4f38b16b95e0e78cb626ab9ece18c950afbfa6b0fdbfa4ff731d3">gf::Scancode::T</a></div><div class="ttdeci">@ T</div></div>
<div class="ttc" id="agroup__net__sockets_html_ggad2a84f7b35acd2f97d8f97f5621fca10ae1e4c8c9ccd9fc39c391da4bcd093fb2"><div class="ttname"><a href="group__net__sockets.html#ggad2a84f7b35acd2f97d8f97f5621fca10ae1e4c8c9ccd9fc39c391da4bcd093fb2">gf::SocketStatus::Block</a></div><div class="ttdeci">@ Block</div><div class="ttdoc">The socket would have blocked.</div></div>
<div class="ttc" id="anamespacegf_html"><div class="ttname"><a href="namespacegf.html">gf</a></div><div class="ttdoc">The namespace for gf classes.</div><div class="ttdef"><b>Definition:</b> Action.h:35</div></div>
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