茂之钳
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<div class="title">memory_pool.h</div> </div>
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<a href="memory__pool_8h.html">浏览该文件的文档.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#pragma once</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#include <cstddef></span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor">#include <vector></span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include <new></span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>  </div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="keyword">namespace </span><a class="code" href="namespacevde_1_1foundation.html">vde::foundation</a> {</div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  </div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
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<div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="classvde_1_1foundation_1_1MemoryPool.html"> 30</a></span> <span class="keyword">class </span><a class="code" href="classvde_1_1foundation_1_1MemoryPool.html">MemoryPool</a> {</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="classvde_1_1foundation_1_1MemoryPool.html#a0228bca74657aa48b902ffb0461e32a5"> 36</a></span>  <span class="keyword">explicit</span> <a class="code" href="classvde_1_1foundation_1_1MemoryPool.html#a0228bca74657aa48b902ffb0461e32a5">MemoryPool</a>(<span class="keywordtype">size_t</span> chunk_size = 1024) : chunk_size_(chunk_size) {}</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  </div>
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<div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="classvde_1_1foundation_1_1MemoryPool.html#a4611d4165f3735ed437822c5d465852b"> 41</a></span>  <a class="code" href="classvde_1_1foundation_1_1MemoryPool.html#a4611d4165f3735ed437822c5d465852b">~MemoryPool</a>() { <span class="keywordflow">for</span> (<span class="keyword">auto</span>* p : chunks_) ::operator <span class="keyword">delete</span>(p); }</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div>
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<div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="classvde_1_1foundation_1_1MemoryPool.html#ac08655947c5c96141200dc9f56f69a58"> 54</a></span>  T* <a class="code" href="classvde_1_1foundation_1_1MemoryPool.html#ac08655947c5c96141200dc9f56f69a58">allocate</a>(<span class="keywordtype">size_t</span> n = 1) {</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">if</span> (free_list_ == <span class="keyword">nullptr</span>) allocate_chunk();</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  T* p = <span class="keyword">static_cast<</span>T*<span class="keyword">></span>(free_list_);</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  free_list_ = *<span class="keyword">reinterpret_cast<</span><span class="keywordtype">void</span>**<span class="keyword">></span>(free_list_);</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">return</span> p;</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  }</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  </div>
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<div class="line"><a name="l00068"></a><span class="lineno"><a class="line" href="classvde_1_1foundation_1_1MemoryPool.html#ab41d1e9d5cf5a85b79056850c1cae439"> 68</a></span>  <span class="keywordtype">void</span> <a class="code" href="classvde_1_1foundation_1_1MemoryPool.html#ab41d1e9d5cf5a85b79056850c1cae439">deallocate</a>(T* p, <span class="keywordtype">size_t</span> = 1) {</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  *<span class="keyword">reinterpret_cast<</span><span class="keywordtype">void</span>**<span class="keyword">></span>(p) = free_list_;</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  free_list_ = p;</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  }</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  </div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordtype">void</span> allocate_chunk() {</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordtype">void</span>* chunk = ::operator <span class="keyword">new</span>(chunk_size_ * <span class="keyword">sizeof</span>(T));</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  chunks_.push_back(chunk);</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordtype">char</span>* base = <span class="keyword">static_cast<</span><span class="keywordtype">char</span>*<span class="keyword">></span>(chunk);</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < chunk_size_; ++i) {</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordtype">void</span>* ptr = base + i * <span class="keyword">sizeof</span>(T);</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  *<span class="keyword">reinterpret_cast<</span><span class="keywordtype">void</span>**<span class="keyword">></span>(ptr) = free_list_;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  free_list_ = ptr;</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  }</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  }</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  </div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">size_t</span> chunk_size_;</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordtype">void</span>* free_list_ = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  std::vector<void*> chunks_;</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> };</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  </div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> } <span class="comment">// namespace vde::foundation</span></div>
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<div class="ttc" id="aclassvde_1_1foundation_1_1MemoryPool_html"><div class="ttname"><a href="classvde_1_1foundation_1_1MemoryPool.html">vde::foundation::MemoryPool</a></div><div class="ttdoc">固定块大小的内存池</div><div class="ttdef"><b>Definition:</b> <a href="memory__pool_8h_source.html#l00030">memory_pool.h:30</a></div></div>
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<div class="ttc" id="aclassvde_1_1foundation_1_1MemoryPool_html_a0228bca74657aa48b902ffb0461e32a5"><div class="ttname"><a href="classvde_1_1foundation_1_1MemoryPool.html#a0228bca74657aa48b902ffb0461e32a5">vde::foundation::MemoryPool::MemoryPool</a></div><div class="ttdeci">MemoryPool(size_t chunk_size=1024)</div><div class="ttdoc">构造内存池</div><div class="ttdef"><b>Definition:</b> <a href="memory__pool_8h_source.html#l00036">memory_pool.h:36</a></div></div>
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<div class="ttc" id="aclassvde_1_1foundation_1_1MemoryPool_html_a4611d4165f3735ed437822c5d465852b"><div class="ttname"><a href="classvde_1_1foundation_1_1MemoryPool.html#a4611d4165f3735ed437822c5d465852b">vde::foundation::MemoryPool::~MemoryPool</a></div><div class="ttdeci">~MemoryPool()</div><div class="ttdoc">析构内存池，释放所有已分配的内存块</div><div class="ttdef"><b>Definition:</b> <a href="memory__pool_8h_source.html#l00041">memory_pool.h:41</a></div></div>
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<div class="ttc" id="aclassvde_1_1foundation_1_1MemoryPool_html_ab41d1e9d5cf5a85b79056850c1cae439"><div class="ttname"><a href="classvde_1_1foundation_1_1MemoryPool.html#ab41d1e9d5cf5a85b79056850c1cae439">vde::foundation::MemoryPool::deallocate</a></div><div class="ttdeci">void deallocate(T *p, size_t=1)</div><div class="ttdoc">将内存归还到池中</div><div class="ttdef"><b>Definition:</b> <a href="memory__pool_8h_source.html#l00068">memory_pool.h:68</a></div></div>
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<div class="ttc" id="aclassvde_1_1foundation_1_1MemoryPool_html_ac08655947c5c96141200dc9f56f69a58"><div class="ttname"><a href="classvde_1_1foundation_1_1MemoryPool.html#ac08655947c5c96141200dc9f56f69a58">vde::foundation::MemoryPool::allocate</a></div><div class="ttdeci">T * allocate(size_t n=1)</div><div class="ttdoc">从池中分配 n 个 T 对象的内存</div><div class="ttdef"><b>Definition:</b> <a href="memory__pool_8h_source.html#l00054">memory_pool.h:54</a></div></div>
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<div class="ttc" id="anamespacevde_1_1foundation_html"><div class="ttname"><a href="namespacevde_1_1foundation.html">vde::foundation</a></div><div class="ttdoc">自适应双精度谓词后端（默认）</div><div class="ttdef"><b>Definition:</b> <a href="error__codes_8h_source.html#l00004">error_codes.h:4</a></div></div>
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