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著名的密码库Crypto++的文档 C++语言的杰作。程序员必备。

<a name="l00073"></a>00073         {
<a name="l00074"></a>00074                 <span class="keyword">typename</span> A::pointer newPointer = a.allocate(newSize, NULL);
<a name="l00075"></a>00075                 memcpy_s(newPointer, <span class="keyword">sizeof</span>(T)*newSize, p, <span class="keyword">sizeof</span>(T)*STDMIN(oldSize, newSize));
<a name="l00076"></a>00076                 a.deallocate(p, oldSize);
<a name="l00077"></a>00077                 <span class="keywordflow">return</span> newPointer;
<a name="l00078"></a>00078         }
<a name="l00079"></a>00079         <span class="keywordflow">else</span>
<a name="l00080"></a>00080         {
<a name="l00081"></a>00081                 a.deallocate(p, oldSize);
<a name="l00082"></a>00082                 <span class="keywordflow">return</span> a.allocate(newSize, NULL);
<a name="l00083"></a>00083         }
<a name="l00084"></a>00084 }
<a name="l00085"></a>00085 
<a name="l00086"></a>00086 <span class="preprocessor">#if defined(_MSC_VER) &amp;&amp; (_MSC_VER &lt; 1300)</span>
<a name="l00087"></a>00087 <span class="preprocessor"></span><span class="preprocessor">#pragma warning(pop)</span>
<a name="l00088"></a>00088 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00089"></a>00089 <span class="preprocessor"></span>
<a name="l00090"></a>00090 <span class="keyword">template</span> &lt;<span class="keyword">class</span> T, <span class="keywordtype">bool</span> T_Align16 = false&gt;
<a name="l00091"></a><a class="code" href="class_allocator_with_cleanup.html">00091</a> <span class="keyword">class </span><a class="code" href="class_allocator_with_cleanup.html">AllocatorWithCleanup</a> : <span class="keyword">public</span> <a class="code" href="class_allocator_base.html">AllocatorBase</a>&lt;T&gt;
<a name="l00092"></a>00092 {
<a name="l00093"></a>00093 <span class="keyword">public</span>:
<a name="l00094"></a><a class="code" href="class_allocator_with_cleanup.html#3f35094e52bc8e4dc31cc998d9cb51e4">00094</a>         CRYPTOPP_INHERIT_ALLOCATOR_TYPES
<a name="l00095"></a>00095 
<a name="l00096"></a><a class="code" href="class_allocator_with_cleanup.html#290b911c8fff91bb837fb30d3ead617f">00096</a>         <a class="code" href="class_allocator_with_cleanup.html#f0b78c2f6b8b5764f79d13adb0e91033">pointer</a> <a class="code" href="class_allocator_with_cleanup.html#290b911c8fff91bb837fb30d3ead617f">allocate</a>(<a class="code" href="class_allocator_with_cleanup.html#f39a831605494994d589ee9734a55c2c">size_type</a> n, <span class="keyword">const</span> <span class="keywordtype">void</span> * = NULL)
<a name="l00097"></a>00097         {
<a name="l00098"></a>00098                 <a class="code" href="class_allocator_base.html#1ffea05c1944ec2b9f8fcff4cd9ee717">CheckSize</a>(n);
<a name="l00099"></a>00099                 <span class="keywordflow">if</span> (n == 0)
<a name="l00100"></a>00100                         <span class="keywordflow">return</span> NULL;
<a name="l00101"></a>00101 
<a name="l00102"></a>00102                 <span class="keywordflow">if</span> (T_Align16 &amp;&amp; n*<span class="keyword">sizeof</span>(T) &gt;= 16)
<a name="l00103"></a>00103                 {
<a name="l00104"></a>00104                         byte *p;
<a name="l00105"></a>00105 <span class="preprocessor">                #ifdef CRYPTOPP_MM_MALLOC_AVAILABLE</span>
<a name="l00106"></a>00106 <span class="preprocessor"></span>                        <span class="keywordflow">while</span> (!(p = (byte *)_mm_malloc(<span class="keyword">sizeof</span>(T)*n, 16)))
<a name="l00107"></a>00107 <span class="preprocessor">                #elif defined(CRYPTOPP_MEMALIGN_AVAILABLE)</span>
<a name="l00108"></a>00108 <span class="preprocessor"></span>                        <span class="keywordflow">while</span> (!(p = (byte *)memalign(16, <span class="keyword">sizeof</span>(T)*n)))
<a name="l00109"></a>00109 <span class="preprocessor">                #elif defined(CRYPTOPP_MALLOC_ALIGNMENT_IS_16)</span>
<a name="l00110"></a>00110 <span class="preprocessor"></span>                        <span class="keywordflow">while</span> (!(p = (byte *)malloc(<span class="keyword">sizeof</span>(T)*n)))
<a name="l00111"></a>00111 <span class="preprocessor">                #else</span>
<a name="l00112"></a>00112 <span class="preprocessor"></span>                        <span class="keywordflow">while</span> (!(p = (byte *)malloc(<span class="keyword">sizeof</span>(T)*n + 16)))
<a name="l00113"></a>00113 <span class="preprocessor">                #endif</span>
<a name="l00114"></a>00114 <span class="preprocessor"></span>                                CallNewHandler();
<a name="l00115"></a>00115 
<a name="l00116"></a>00116 <span class="preprocessor">                #ifdef CRYPTOPP_NO_ALIGNED_ALLOC</span>
<a name="l00117"></a>00117 <span class="preprocessor"></span>                        <span class="keywordtype">size_t</span> adjustment = 16-((size_t)p%16);
<a name="l00118"></a>00118                         p += adjustment;
<a name="l00119"></a>00119                         p[-1] = (byte)adjustment;
<a name="l00120"></a>00120 <span class="preprocessor">                #endif</span>
<a name="l00121"></a>00121 <span class="preprocessor"></span>
<a name="l00122"></a>00122                         assert(IsAlignedOn(p, 16));
<a name="l00123"></a>00123                         <span class="keywordflow">return</span> (<a class="code" href="class_allocator_with_cleanup.html#f0b78c2f6b8b5764f79d13adb0e91033">pointer</a>)p;
<a name="l00124"></a>00124                 }
<a name="l00125"></a>00125 
<a name="l00126"></a>00126                 <a class="code" href="class_allocator_with_cleanup.html#f0b78c2f6b8b5764f79d13adb0e91033">pointer</a> p;
<a name="l00127"></a>00127                 <span class="keywordflow">while</span> (!(p = (<a class="code" href="class_allocator_with_cleanup.html#f0b78c2f6b8b5764f79d13adb0e91033">pointer</a>)malloc(<span class="keyword">sizeof</span>(T)*n)))
<a name="l00128"></a>00128                         CallNewHandler();
<a name="l00129"></a>00129                 <span class="keywordflow">return</span> p;
<a name="l00130"></a>00130         }
<a name="l00131"></a>00131 
<a name="l00132"></a><a class="code" href="class_allocator_with_cleanup.html#59c577b531bfb3ffcdb9f59589917082">00132</a>         <span class="keywordtype">void</span> <a class="code" href="class_allocator_with_cleanup.html#59c577b531bfb3ffcdb9f59589917082">deallocate</a>(<span class="keywordtype">void</span> *p, <a class="code" href="class_allocator_with_cleanup.html#f39a831605494994d589ee9734a55c2c">size_type</a> n)
<a name="l00133"></a>00133         {
<a name="l00134"></a>00134                 memset(p, 0, n*<span class="keyword">sizeof</span>(T));
<a name="l00135"></a>00135 
<a name="l00136"></a>00136                 <span class="keywordflow">if</span> (T_Align16 &amp;&amp; n*<span class="keyword">sizeof</span>(T) &gt;= 16)
<a name="l00137"></a>00137                 {
<a name="l00138"></a>00138 <span class="preprocessor">                #ifdef CRYPTOPP_MM_MALLOC_AVAILABLE</span>
<a name="l00139"></a>00139 <span class="preprocessor"></span>                        _mm_free(p);
<a name="l00140"></a>00140 <span class="preprocessor">                #elif defined(CRYPTOPP_NO_ALIGNED_ALLOC)</span>
<a name="l00141"></a>00141 <span class="preprocessor"></span>                        p = (byte *)p - ((byte *)p)[-1];
<a name="l00142"></a>00142                         free(p);
<a name="l00143"></a>00143 <span class="preprocessor">                #else</span>
<a name="l00144"></a>00144 <span class="preprocessor"></span>                        free(p);
<a name="l00145"></a>00145 <span class="preprocessor">                #endif</span>
<a name="l00146"></a>00146 <span class="preprocessor"></span>                        <span class="keywordflow">return</span>;
<a name="l00147"></a>00147                 }
<a name="l00148"></a>00148 
<a name="l00149"></a>00149                 free(p);
<a name="l00150"></a>00150         }
<a name="l00151"></a>00151 
<a name="l00152"></a><a class="code" href="class_allocator_with_cleanup.html#3f2099086655e07cbe75fa995b24a8d4">00152</a>         <a class="code" href="class_allocator_with_cleanup.html#f0b78c2f6b8b5764f79d13adb0e91033">pointer</a> <a class="code" href="class_allocator_with_cleanup.html#3f2099086655e07cbe75fa995b24a8d4">reallocate</a>(T *p, <a class="code" href="class_allocator_with_cleanup.html#f39a831605494994d589ee9734a55c2c">size_type</a> oldSize, <a class="code" href="class_allocator_with_cleanup.html#f39a831605494994d589ee9734a55c2c">size_type</a> newSize, <span class="keywordtype">bool</span> preserve)
<a name="l00153"></a>00153         {
<a name="l00154"></a>00154                 <span class="keywordflow">return</span> StandardReallocate(*<span class="keyword">this</span>, p, oldSize, newSize, preserve);
<a name="l00155"></a>00155         }
<a name="l00156"></a>00156 
<a name="l00157"></a>00157         <span class="comment">// VS.NET STL enforces the policy of "All STL-compliant allocators have to provide a</span>
<a name="l00158"></a>00158         <span class="comment">// template class member called rebind".</span>
<a name="l00159"></a><a class="code" href="struct_allocator_with_cleanup_1_1rebind.html#2a7f2cba8e94ea40fd2cc02e95808530">00159</a>     <span class="keyword">template</span> &lt;<span class="keyword">class</span> U&gt; <span class="keyword">struct </span><a class="code" href="struct_allocator_with_cleanup_1_1rebind.html">rebind</a> { <span class="keyword">typedef</span> <a class="code" href="class_allocator_with_cleanup.html">AllocatorWithCleanup&lt;U, T_Align16&gt;</a> <a class="code" href="class_allocator_with_cleanup.html">other</a>; };
<a name="l00160"></a>00160 <span class="preprocessor">#if _MSC_VER &gt;= 1500</span>
<a name="l00161"></a>00161 <span class="preprocessor"></span>        <a class="code" href="class_allocator_with_cleanup.html">AllocatorWithCleanup</a>() {}
<a name="l00162"></a>00162         <span class="keyword">template</span> &lt;<span class="keyword">class</span> U, <span class="keywordtype">bool</span> A&gt; <a class="code" href="class_allocator_with_cleanup.html">AllocatorWithCleanup</a>(<span class="keyword">const</span> <a class="code" href="class_allocator_with_cleanup.html">AllocatorWithCleanup&lt;U, A&gt;</a> &amp;) {}
<a name="l00163"></a>00163 <span class="preprocessor">#endif</span>
<a name="l00164"></a>00164 <span class="preprocessor"></span>};
<a name="l00165"></a>00165