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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="l00064"></a>00064         {
<a name="l00065"></a>00065                 <span class="keywordflow">return</span> (!this-&gt;m_p &amp;&amp; !rhs.<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>) || (this-&gt;<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a> &amp;&amp; rhs.<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a> &amp;&amp; *this-&gt;<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a> == *rhs.<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>);
<a name="l00066"></a>00066         }
<a name="l00067"></a>00067 };
<a name="l00068"></a>00068 
<a name="l00069"></a><a class="code" href="classvalue__ptr.html#6a4da1b0640d05e7f18eb7a77f067617">00069</a> <span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <a class="code" href="classvalue__ptr.html">value_ptr&lt;T&gt;</a>&amp; <a class="code" href="classvalue__ptr.html#6a4da1b0640d05e7f18eb7a77f067617">value_ptr&lt;T&gt;::operator=</a>(<span class="keyword">const</span> <a class="code" href="classvalue__ptr.html">value_ptr&lt;T&gt;</a>&amp; rhs)
<a name="l00070"></a>00070 {
<a name="l00071"></a>00071         T *old_p = this-&gt;<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>;
<a name="l00072"></a>00072         this-&gt;<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a> = rhs.<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a> ? <span class="keyword">new</span> T(*rhs.<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>) : NULL;
<a name="l00073"></a>00073         <span class="keyword">delete</span> old_p;
<a name="l00074"></a>00074         <span class="keywordflow">return</span> *<span class="keyword">this</span>;
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 
<a name="l00077"></a>00077 <span class="comment">// ********************************************************</span>
<a name="l00078"></a>00078 
<a name="l00079"></a><a class="code" href="classclonable__ptr.html">00079</a> <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt; <span class="keyword">class </span><a class="code" href="classclonable__ptr.html">clonable_ptr</a> : <span class="keyword">public</span> <a class="code" href="classmember__ptr.html">member_ptr</a>&lt;T&gt;
<a name="l00080"></a>00080 {
<a name="l00081"></a>00081 <span class="keyword">public</span>:
<a name="l00082"></a><a class="code" href="classclonable__ptr.html#0b979cda52711b98f55519452bd280d5">00082</a>         <a class="code" href="classclonable__ptr.html">clonable_ptr</a>(<span class="keyword">const</span> T &amp;obj) : <a class="code" href="classmember__ptr.html">member_ptr</a>&lt;T&gt;(obj.Clone()) {}
<a name="l00083"></a><a class="code" href="classclonable__ptr.html#e6e1a740d3fcf79bacf0949951ab44cb">00083</a>         <a class="code" href="classclonable__ptr.html">clonable_ptr</a>(T *p = NULL) : <a class="code" href="classmember__ptr.html">member_ptr</a>&lt;T&gt;(p) {}
<a name="l00084"></a><a class="code" href="classclonable__ptr.html#5e0c040b25241109601866a7a25f16bf">00084</a>         <a class="code" href="classclonable__ptr.html">clonable_ptr</a>(<span class="keyword">const</span> <a class="code" href="classclonable__ptr.html">clonable_ptr&lt;T&gt;</a>&amp; rhs)
<a name="l00085"></a>00085                 : <a class="code" href="classmember__ptr.html">member_ptr</a>&lt;T&gt;(rhs.<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a> ? rhs.<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>-&gt;Clone() : NULL) {}
<a name="l00086"></a>00086 
<a name="l00087"></a>00087         <a class="code" href="classclonable__ptr.html">clonable_ptr&lt;T&gt;</a>&amp; <a class="code" href="classvalue__ptr.html#6a4da1b0640d05e7f18eb7a77f067617">operator=</a>(<span class="keyword">const</span> <a class="code" href="classclonable__ptr.html">clonable_ptr&lt;T&gt;</a>&amp; rhs);
<a name="l00088"></a>00088 };
<a name="l00089"></a>00089 
<a name="l00090"></a><a class="code" href="classclonable__ptr.html#b8bf1ea54e4f115885c465b759d75052">00090</a> <span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <a class="code" href="classclonable__ptr.html">clonable_ptr&lt;T&gt;</a>&amp; <a class="code" href="classclonable__ptr.html#b8bf1ea54e4f115885c465b759d75052">clonable_ptr&lt;T&gt;::operator=</a>(<span class="keyword">const</span> <a class="code" href="classclonable__ptr.html">clonable_ptr&lt;T&gt;</a>&amp; rhs)
<a name="l00091"></a>00091 {
<a name="l00092"></a>00092         T *old_p = this-&gt;<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>;
<a name="l00093"></a>00093         this-&gt;<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a> = rhs.<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a> ? rhs.<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>-&gt;Clone() : NULL;
<a name="l00094"></a>00094         <span class="keyword">delete</span> old_p;
<a name="l00095"></a>00095         <span class="keywordflow">return</span> *<span class="keyword">this</span>;
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097 
<a name="l00098"></a>00098 <span class="comment">// ********************************************************</span>
<a name="l00099"></a>00099 
<a name="l00100"></a><a class="code" href="classcounted__ptr.html">00100</a> <span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt; <span class="keyword">class </span><a class="code" href="classcounted__ptr.html">counted_ptr</a>
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102 <span class="keyword">public</span>:
<a name="l00103"></a>00103         <span class="keyword">explicit</span> <a class="code" href="classcounted__ptr.html">counted_ptr</a>(T *p = 0);
<a name="l00104"></a><a class="code" href="classcounted__ptr.html#d5de505f03ec61d48408023e81ca0a2c">00104</a>         <a class="code" href="classcounted__ptr.html">counted_ptr</a>(<span class="keyword">const</span> T &amp;r) : <a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>(0) {attach(r);}
<a name="l00105"></a>00105         <a class="code" href="classcounted__ptr.html">counted_ptr</a>(<span class="keyword">const</span> <a class="code" href="classcounted__ptr.html">counted_ptr&lt;T&gt;</a>&amp; rhs);
<a name="l00106"></a>00106 
<a name="l00107"></a>00107         ~<a class="code" href="classcounted__ptr.html">counted_ptr</a>();
<a name="l00108"></a>00108 
<a name="l00109"></a><a class="code" href="classcounted__ptr.html#3ab9844cffa50476b517bc8d0f2c6b47">00109</a>         <span class="keyword">const</span> T&amp; <a class="code" href="classmember__ptr.html#cb313509122835253aa304f2dff87133">operator*</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>; }
<a name="l00110"></a><a class="code" href="classcounted__ptr.html#09560d7ce6147f5f6505b41452232c32">00110</a>         T&amp; <a class="code" href="classmember__ptr.html#cb313509122835253aa304f2dff87133">operator*</a>() { <span class="keywordflow">return</span> *<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>; }
<a name="l00111"></a>00111 
<a name="l00112"></a><a class="code" href="classcounted__ptr.html#912213476f94ca8ba4aa912907b07be4">00112</a>         <span class="keyword">const</span> T* <a class="code" href="classmember__ptr.html#f98d04ac57ff3a330394f4327aa805b1">operator-&gt;</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>; }
<a name="l00113"></a><a class="code" href="classcounted__ptr.html#11cc57380df68abd9f191076612e771d">00113</a>         T* <a class="code" href="classmember__ptr.html#f98d04ac57ff3a330394f4327aa805b1">operator-&gt;</a>() { <span class="keywordflow">return</span> <span class="keyword">get</span>(); }
<a name="l00114"></a>00114 
<a name="l00115"></a><a class="code" href="classcounted__ptr.html#8bd7974ddad0830a587475ae25847148">00115</a>         <span class="keyword">const</span> T* <span class="keyword">get</span>() <span class="keyword">const</span> { <span class="keywordflow">return</span> <a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>; }
<a name="l00116"></a>00116         T* <span class="keyword">get</span>();
<a name="l00117"></a>00117 
<a name="l00118"></a>00118         <span class="keywordtype">void</span> attach(<span class="keyword">const</span> T &amp;p);
<a name="l00119"></a>00119 
<a name="l00120"></a>00120         <a class="code" href="classcounted__ptr.html">counted_ptr&lt;T&gt;</a> &amp; <a class="code" href="classclonable__ptr.html#b8bf1ea54e4f115885c465b759d75052">operator=</a>(<span class="keyword">const</span> <a class="code" href="classcounted__ptr.html">counted_ptr&lt;T&gt;</a>&amp; rhs);
<a name="l00121"></a>00121 
<a name="l00122"></a>00122 <span class="keyword">private</span>:
<a name="l00123"></a>00123         T *<a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>;
<a name="l00124"></a>00124 };
<a name="l00125"></a>00125 
<a name="l00126"></a><a class="code" href="classcounted__ptr.html#a290dbadac3873d8f193ac7a484ada24">00126</a> <span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <a class="code" href="classcounted__ptr.html#a290dbadac3873d8f193ac7a484ada24">counted_ptr&lt;T&gt;::counted_ptr</a>(T *p)
<a name="l00127"></a>00127         : <a class="code" href="classmember__ptr.html#82d41ef68f80d1add88d40ed274e2357">m_p</a>(p) 
<a name="l00128"></a>00128 {
<a name="l00129"></a>00129         <span class="keywordflow">if</span> (m_p)
<a name="l00130"></a>00130                 m_p-&gt;m_referenceCount = 1;
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 
<a name="l00133"></a><a class="code" href="classcounted__ptr.html#ddd6a26d75df27b597575d866994099c">00133</a> <span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <a class="code" href="classcounted__ptr.html#a290dbadac3873d8f193ac7a484ada24">counted_ptr&lt;T&gt;::counted_ptr</a>(<span class="keyword">const</span> <a class="code" href="classcounted__ptr.html">counted_ptr&lt;T&gt;</a>&amp; rhs)
<a name="l00134"></a>00134         : m_p(rhs.m_p)
<a name="l00135"></a>00135 {
<a name="l00136"></a>00136         <span class="keywordflow">if</span> (m_p)
<a name="l00137"></a>00137                 m_p-&gt;m_referenceCount++;
<a name="l00138"></a>00138 }
<a name="l00139"></a>00139 
<a name="l00140"></a><a class="code" href="classcounted__ptr.html#8b23efee2c3349c85b0acb9cb0c02b88">00140</a> <span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <a class="code" href="classcounted__ptr.html#8b23efee2c3349c85b0acb9cb0c02b88">counted_ptr&lt;T&gt;::~counted_ptr</a>()
<a name="l00141"></a>00141 {
<a name="l00142"></a>00142         <span class="keywordflow">if</span> (m_p &amp;&amp; --m_p-&gt;m_referenceCount == 0)
<a name="l00143"></a>00143                 <span class="keyword">delete</span> m_p;
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145 
<a name="l00146"></a><a class="code" href="classcounted__ptr.html#09a2d2772ced9edcb5c787534e6221b9">00146</a> <span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt; <span class="keywordtype">void</span> <a class="code" href="classcounted__ptr.html#09a2d2772ced9edcb5c787534e6221b9">counted_ptr&lt;T&gt;::attach</a>(<span class="keyword">const</span> T &amp;r)
<a name="l00147"></a>00147 {