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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h1>refcounted.h</h1><a href="refcounted_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00002"></a>00002
<a name="l00003"></a>00003
<a name="l00004"></a>00004 <span class="comment">/***********************************************************************</span>
<a name="l00005"></a>00005 <span class="comment"> Copyright (c) 2007 by Educational Technology Resources, Inc. and</span>
<a name="l00006"></a>00006 <span class="comment"> (c) 2007 by Jonathan Wakely. Others may also hold copyrights on</span>
<a name="l00007"></a>00007 <span class="comment"> code in this file. See the CREDITS.txt file in the top directory</span>
<a name="l00008"></a>00008 <span class="comment"> of the distribution for details.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment"> This file is part of MySQL++.</span>
<a name="l00011"></a>00011 <span class="comment"></span>
<a name="l00012"></a>00012 <span class="comment"> MySQL++ is free software; you can redistribute it and/or modify it</span>
<a name="l00013"></a>00013 <span class="comment"> under the terms of the GNU Lesser General Public License as published</span>
<a name="l00014"></a>00014 <span class="comment"> by the Free Software Foundation; either version 2.1 of the License, or</span>
<a name="l00015"></a>00015 <span class="comment"> (at your option) any later version.</span>
<a name="l00016"></a>00016 <span class="comment"></span>
<a name="l00017"></a>00017 <span class="comment"> MySQL++ is distributed in the hope that it will be useful, but WITHOUT</span>
<a name="l00018"></a>00018 <span class="comment"> ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or</span>
<a name="l00019"></a>00019 <span class="comment"> FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public</span>
<a name="l00020"></a>00020 <span class="comment"> License for more details.</span>
<a name="l00021"></a>00021 <span class="comment"></span>
<a name="l00022"></a>00022 <span class="comment"> You should have received a copy of the GNU Lesser General Public</span>
<a name="l00023"></a>00023 <span class="comment"> License along with MySQL++; if not, write to the Free Software</span>
<a name="l00024"></a>00024 <span class="comment"> Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301</span>
<a name="l00025"></a>00025 <span class="comment"> USA</span>
<a name="l00026"></a>00026 <span class="comment">***********************************************************************/</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="preprocessor">#if !defined(MYSQLPP_REFCOUNTED_H)</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor">#define MYSQLPP_REFCOUNTED_H</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span>
<a name="l00031"></a>00031 <span class="preprocessor">#include <memory></span>
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="keyword">namespace </span>mysqlpp {
<a name="l00034"></a>00034
<a name="l00042"></a>00042 <span class="keyword">template</span> <<span class="keyword">class</span> T>
<a name="l00043"></a><a class="code" href="structmysqlpp_1_1RefCountedPointerDestroyer.html">00043</a> <span class="keyword">struct </span><a class="code" href="structmysqlpp_1_1RefCountedPointerDestroyer.html">RefCountedPointerDestroyer</a>
<a name="l00044"></a>00044 {
<a name="l00046"></a><a class="code" href="structmysqlpp_1_1RefCountedPointerDestroyer.html#6009c03320583a0f3c89a8819b15e0a4">00046</a> <span class="keywordtype">void</span> <a class="code" href="structmysqlpp_1_1RefCountedPointerDestroyer.html#6009c03320583a0f3c89a8819b15e0a4">operator()</a>(T* doomed)<span class="keyword"> const </span>{ <span class="keyword">delete</span> doomed; }
<a name="l00047"></a>00047 };
<a name="l00048"></a>00048
<a name="l00049"></a>00049
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="keyword">template</span> <<span class="keyword">class</span> T, <span class="keyword">class</span> Destroyer = RefCountedPo<span class="keywordtype">int</span>erDestroyer<T> >
<a name="l00078"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html">00078</a> <span class="keyword">class </span><a class="code" href="classmysqlpp_1_1RefCountedPointer.html">RefCountedPointer</a>
<a name="l00079"></a>00079 {
<a name="l00080"></a>00080 <span class="keyword">public</span>:
<a name="l00081"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#745d3cf3d478d70c09474eb8766bae3a">00081</a> <span class="keyword">typedef</span> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html">RefCountedPointer<T></a> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html">ThisType</a>;
<a name="l00082"></a>00082
<a name="l00087"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#02aa2860b0644b6333cee8f321477fee">00087</a> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#02aa2860b0644b6333cee8f321477fee">RefCountedPointer</a>() :
<a name="l00088"></a>00088 counted_(0),
<a name="l00089"></a>00089 refs_(0)
<a name="l00090"></a>00090 {
<a name="l00091"></a>00091 }
<a name="l00092"></a>00092
<a name="l00098"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#586313b144a88e487d77adf7d64bd3bb">00098</a> <span class="keyword">explicit</span> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#02aa2860b0644b6333cee8f321477fee">RefCountedPointer</a>(T* c) :
<a name="l00099"></a>00099 counted_(c),
<a name="l00100"></a>00100 refs_(0)
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102 std::auto_ptr<T> exception_guard(counted_);
<a name="l00103"></a>00103 <span class="keywordflow">if</span> (counted_) {
<a name="l00104"></a>00104 refs_ = <span class="keyword">new</span> size_t(1);
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106 exception_guard.release(); <span class="comment">// previous new didn't throw</span>
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108
<a name="l00110"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#e25ec10685c0c1ae2c7afa6bd72f483c">00110</a> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#02aa2860b0644b6333cee8f321477fee">RefCountedPointer</a>(<span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html">ThisType</a>& other) :
<a name="l00111"></a>00111 counted_(other.counted_),
<a name="l00112"></a>00112 refs_(other.counted_ ? other.refs_ : 0)
<a name="l00113"></a>00113 {
<a name="l00114"></a>00114 <span class="keywordflow">if</span> (counted_) {
<a name="l00115"></a>00115 ++(*refs_);
<a name="l00116"></a>00116 }
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118
<a name="l00123"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#67b7d093310fa6112a45c361c37d5ed3">00123</a> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#67b7d093310fa6112a45c361c37d5ed3">~RefCountedPointer</a>()
<a name="l00124"></a>00124 {
<a name="l00125"></a>00125 <span class="keywordflow">if</span> (refs_ && (--(*refs_) == 0)) {
<a name="l00126"></a>00126 Destroyer()(counted_);
<a name="l00127"></a>00127 <span class="keyword">delete</span> refs_;
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129 }
<a name="l00130"></a>00130
<a name="l00138"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#c6a54b0c4fdac3d05389639c5bc71168">00138</a> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html">ThisType</a>& <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#c6a54b0c4fdac3d05389639c5bc71168">assign</a>(T* c)
<a name="l00139"></a>00139 {
<a name="l00140"></a>00140 <span class="comment">// The create-temporary-and-swap idiom lets us keep memory</span>
<a name="l00141"></a>00141 <span class="comment">// allocation in the ctor and deallocation in the dtor so</span>
<a name="l00142"></a>00142 <span class="comment">// we don't leak in the face of an exception.</span>
<a name="l00143"></a>00143 <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#745d3cf3d478d70c09474eb8766bae3a">ThisType</a>(c).swap(*<span class="keyword">this</span>);
<a name="l00144"></a>00144 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146
<a name="l00155"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#a806e37d44b4d0384dc0bcd1deefd1b9">00155</a> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html">ThisType</a>& <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#c6a54b0c4fdac3d05389639c5bc71168">assign</a>(<span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html">ThisType</a>& other)
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157 <span class="comment">// The create-temporary-and-swap idiom lets us keep memory</span>
<a name="l00158"></a>00158 <span class="comment">// allocation in the ctor and deallocation in the dtor so</span>
<a name="l00159"></a>00159 <span class="comment">// we don't leak in the face of an exception.</span>
<a name="l00160"></a>00160 <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#745d3cf3d478d70c09474eb8766bae3a">ThisType</a>(other).swap(*<span class="keyword">this</span>);
<a name="l00161"></a>00161 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
<a name="l00162"></a>00162 }
<a name="l00163"></a>00163
<a name="l00168"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#33e254256ace5abc2b07d8a630e55188">00168</a> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html">ThisType</a>& <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#33e254256ace5abc2b07d8a630e55188">operator =</a>(T* c)
<a name="l00169"></a>00169 {
<a name="l00170"></a>00170 <span class="keywordflow">return</span> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#c6a54b0c4fdac3d05389639c5bc71168">assign</a>(c);
<a name="l00171"></a>00171 }
<a name="l00172"></a>00172
<a name="l00178"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#506a85c3e871b5436eb20d6436fb5d9d">00178</a> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html">ThisType</a>& <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#33e254256ace5abc2b07d8a630e55188">operator =</a>(<span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html">ThisType</a>& rhs)
<a name="l00179"></a>00179 {
<a name="l00180"></a>00180 <span class="keywordflow">return</span> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#c6a54b0c4fdac3d05389639c5bc71168">assign</a>(rhs);
<a name="l00181"></a>00181 }
<a name="l00182"></a>00182
<a name="l00184"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#02fc8a47004dad04067d7cb781e93dd7">00184</a> T* <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#02fc8a47004dad04067d7cb781e93dd7">operator -></a>()<span class="keyword"> const</span>
<a name="l00185"></a>00185 <span class="keyword"> </span>{
<a name="l00186"></a>00186 <span class="keywordflow">return</span> counted_;
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188
<a name="l00190"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#f31d17f14e26b6605ff192d58ababea9">00190</a> T& <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#f31d17f14e26b6605ff192d58ababea9">operator *</a>()<span class="keyword"> const</span>
<a name="l00191"></a>00191 <span class="keyword"> </span>{
<a name="l00192"></a>00192 <span class="keywordflow">return</span> *counted_;
<a name="l00193"></a>00193 }
<a name="l00194"></a>00194
<a name="l00214"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#48f681f74dbe025e8c639f65850e2302">00214</a> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#48f681f74dbe025e8c639f65850e2302">operator void*</a>()
<a name="l00215"></a>00215 {
<a name="l00216"></a>00216 <span class="keywordflow">return</span> counted_;
<a name="l00217"></a>00217 }
<a name="l00218"></a>00218
<a name="l00222"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#067a0afe4a3f5ef1a6a68ddbcdced99a">00222</a> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#067a0afe4a3f5ef1a6a68ddbcdced99a">operator const void*</a>()<span class="keyword"> const</span>
<a name="l00223"></a>00223 <span class="keyword"> </span>{
<a name="l00224"></a>00224 <span class="keywordflow">return</span> counted_;
<a name="l00225"></a>00225 }
<a name="l00226"></a>00226
<a name="l00228"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#26757f1138dded33faeb1978004d0639">00228</a> T* <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#26757f1138dded33faeb1978004d0639">raw</a>()
<a name="l00229"></a>00229 {
<a name="l00230"></a>00230 <span class="keywordflow">return</span> counted_;
<a name="l00231"></a>00231 }
<a name="l00232"></a>00232
<a name="l00234"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#a2698fb8295dcab0c4bc1df9253c8509">00234</a> <span class="keyword">const</span> T* <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#26757f1138dded33faeb1978004d0639">raw</a>()<span class="keyword"> const</span>
<a name="l00235"></a>00235 <span class="keyword"> </span>{
<a name="l00236"></a>00236 <span class="keywordflow">return</span> counted_;
<a name="l00237"></a>00237 }
<a name="l00238"></a>00238
<a name="l00243"></a><a class="code" href="classmysqlpp_1_1RefCountedPointer.html#c6de38aa306bfe6166384e70bc9dbaef">00243</a> <span class="keywordtype">void</span> <a class="code" href="classmysqlpp_1_1RefCountedPointer.html#c6de38aa306bfe6166384e70bc9dbaef">swap</a>(<a class="code" href="classmysqlpp_1_1RefCountedPointer.html">ThisType</a>& other)
<a name="l00244"></a>00244 {
<a name="l00245"></a>00245 std::swap(counted_, other.<a class="code" href="classmysqlpp_1_1RefCountedPointer.html#79005d82ddadc43b4c36860efecfe8ac">counted_</a>);
<a name="l00246"></a>00246 std::swap(refs_, other.<a class="code" href="classmysqlpp_1_1RefCountedPointer.html#6dead477b1df59e525270be82283a88f">refs_</a>);
<a name="l00247"></a>00247 }
<a name="l00248"></a>00248
<a name="l00249"></a>00249 <span class="keyword">private</span>:
<a name="l00251"></a>00251 T* counted_;
<a name="l00252"></a>00252
<a name="l00258"></a>00258 size_t* refs_;
<a name="l00259"></a>00259 };
<a name="l00260"></a>00260
<a name="l00261"></a>00261
<a name="l00262"></a>00262 } <span class="comment">// end namespace mysqlpp</span>
<a name="l00263"></a>00263
<a name="l00264"></a>00264 <span class="preprocessor">#endif // !defined(MYSQLPP_REFCOUNTED_H)</span>
<a name="l00265"></a>00265 <span class="preprocessor"></span>
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