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<h1>csutil/cowwrapper.h</h1><a href="cowwrapper_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">    Copyright (C) 2006 by Frank Richter</span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment">    This library is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment">    modify it under the terms of the GNU Library General Public</span>
<a name="l00006"></a>00006 <span class="comment">    License as published by the Free Software Foundation; either</span>
<a name="l00007"></a>00007 <span class="comment">    version 2 of the License, or (at your option) any later version.</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment">    This library is distributed in the hope that it will be useful,</span>
<a name="l00010"></a>00010 <span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00011"></a>00011 <span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</span>
<a name="l00012"></a>00012 <span class="comment">    Library General Public License for more details.</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment">    You should have received a copy of the GNU Library General Public</span>
<a name="l00015"></a>00015 <span class="comment">    License along with this library; if not, write to the Free</span>
<a name="l00016"></a>00016 <span class="comment">    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.</span>
<a name="l00017"></a>00017 <span class="comment">*/</span>
<a name="l00018"></a>00018 
<a name="l00019"></a>00019 <span class="preprocessor">#ifndef __CS_CSUTIL_COWWRAPPER_H__</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor">#define __CS_CSUTIL_COWWRAPPER_H__</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include "<a class="code" href="custom__new__disable_8h.html" title="Include file to disable CrystalSpace&amp;#39;s &amp;#39;operator new&amp;#39; override, which...">csutil/custom_new_disable.h</a>"</span>
<a name="l00023"></a>00023 
<a name="l00024"></a>00024 <span class="preprocessor">#include "<a class="code" href="allocator_8h.html" title="Basic allocator classes.">csutil/allocator.h</a>"</span>
<a name="l00025"></a>00025 
<a name="l00030"></a>00030 <span class="keyword">namespace </span>CS
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 
<a name="l00061"></a>00061   <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">class</span> MemoryAllocator = Memory::AllocatorMalloc&gt;
<a name="l00062"></a><a class="code" href="classCS_1_1CowWrapper.html">00062</a>   <span class="keyword">class </span><a class="code" href="classCS_1_1CowWrapper.html" title="Copy-on-write wrapper for arbitrary types.">CowWrapper</a>
<a name="l00063"></a>00063   {
<a name="l00065"></a>00065     <span class="keyword">struct </span>WrappedData
<a name="l00066"></a>00066     {
<a name="l00067"></a>00067       <span class="keywordtype">int</span> refcount;
<a name="l00068"></a>00068   
<a name="l00069"></a>00069       <span class="keywordtype">void</span> IncRef () { refcount++; }
<a name="l00070"></a>00070       <span class="keywordtype">void</span> DecRef () 
<a name="l00071"></a>00071       { 
<a name="l00072"></a>00072         refcount--; 
<a name="l00073"></a>00073         <span class="keywordflow">if</span> (refcount == 0) 
<a name="l00074"></a>00074         {
<a name="l00075"></a>00075           this-&gt;~WrappedData();
<a name="l00076"></a>00076           MemoryAllocator::Free (<span class="keyword">this</span>);
<a name="l00077"></a>00077         }
<a name="l00078"></a>00078       }
<a name="l00079"></a>00079       <span class="keywordtype">int</span> GetRefCount ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> refcount; }
<a name="l00080"></a>00080       
<a name="l00081"></a>00081       T data;
<a name="l00082"></a>00082     <span class="keyword">public</span>:
<a name="l00083"></a>00083       WrappedData (<span class="keyword">const</span> T&amp; other) : refcount (1), data (other) {}
<a name="l00084"></a>00084       WrappedData (<span class="keyword">const</span> WrappedData&amp; other) : refcount (1), data (other.data) {}
<a name="l00085"></a>00085     };
<a name="l00086"></a>00086   <span class="keyword">public</span>:
<a name="l00087"></a><a class="code" href="classCS_1_1CowWrapper.html#d67ec763181398cbbba500f71b04fbe0">00087</a>     <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">size_t</span> <a class="code" href="classCS_1_1CowWrapper.html#d67ec763181398cbbba500f71b04fbe0">allocSize</a> = <span class="keyword">sizeof</span> (WrappedData);
<a name="l00088"></a>00088   <span class="keyword">private</span>:
<a name="l00089"></a>00089     <a class="code" href="classcsRef.html" title="A smart pointer.">csRef&lt;WrappedData&gt;</a> data;
<a name="l00090"></a>00090     <span class="keyword">inline</span> WrappedData* NewData (<span class="keyword">const</span> T&amp; other)
<a name="l00091"></a>00091     {
<a name="l00092"></a>00092       WrappedData* p = (WrappedData*)MemoryAllocator::Alloc (<a class="code" href="classCS_1_1CowWrapper.html#d67ec763181398cbbba500f71b04fbe0">allocSize</a>);
<a name="l00093"></a>00093       <span class="keyword">new</span> (p) WrappedData (other);
<a name="l00094"></a>00094       <span class="keywordflow">return</span> p;
<a name="l00095"></a>00095     }
<a name="l00096"></a>00096   <span class="keyword">public</span>:
<a name="l00098"></a><a class="code" href="classCS_1_1CowWrapper.html#9bed6919141dbe1aac3708367e8641d9">00098</a>     <a class="code" href="classCS_1_1CowWrapper.html#9bed6919141dbe1aac3708367e8641d9" title="Copy reference to data from other.">CowWrapper</a> (<span class="keyword">const</span> <a class="code" href="classCS_1_1CowWrapper.html" title="Copy-on-write wrapper for arbitrary types.">CowWrapper</a>&amp; other) : data (other.data) {}
<a name="l00100"></a><a class="code" href="classCS_1_1CowWrapper.html#041c1152ca5b28f7808b5041f319ec9c">00100</a>     <a class="code" href="classCS_1_1CowWrapper.html#9bed6919141dbe1aac3708367e8641d9" title="Copy reference to data from other.">CowWrapper</a> (<span class="keyword">const</span> T&amp; other)
<a name="l00101"></a>00101     {
<a name="l00102"></a>00102       data.AttachNew (NewData (other));
<a name="l00103"></a>00103     }
<a name="l00104"></a>00104 
<a name="l00106"></a><a class="code" href="classCS_1_1CowWrapper.html#803d8ead4e91477282bcc9e6ec4c794d">00106</a>     <span class="keyword">const</span> T&amp; <a class="code" href="classCS_1_1CowWrapper.html#803d8ead4e91477282bcc9e6ec4c794d" title="Return a const reference to the contained data.">operator* </a>()<span class="keyword"> const</span>
<a name="l00107"></a>00107 <span class="keyword">    </span>{
<a name="l00108"></a>00108       <span class="keywordflow">return</span> data-&gt;data;
<a name="l00109"></a>00109     }
<a name="l00115"></a><a class="code" href="classCS_1_1CowWrapper.html#649b992bc45e17dbe3a76223c061d9bc">00115</a>     T&amp; <a class="code" href="classCS_1_1CowWrapper.html#803d8ead4e91477282bcc9e6ec4c794d" title="Return a const reference to the contained data.">operator* </a>()
<a name="l00116"></a>00116     {
<a name="l00117"></a>00117       <span class="keywordflow">if</span> (data-&gt;GetRefCount() &gt; 1)
<a name="l00118"></a>00118       {
<a name="l00119"></a>00119         WrappedData* newData = NewData (data-&gt;data);
<a name="l00120"></a>00120         data.AttachNew (newData);
<a name="l00121"></a>00121       }
<a name="l00122"></a>00122       <span class="keywordflow">return</span> data-&gt;data;
<a name="l00123"></a>00123     }
<a name="l00125"></a><a class="code" href="classCS_1_1CowWrapper.html#5a11d334c8fc1946bc530e8ad8ff3959">00125</a>     <span class="keyword">const</span> T* <a class="code" href="classCS_1_1CowWrapper.html#5a11d334c8fc1946bc530e8ad8ff3959" title="Return a const pointer to the contained data.">operator -&gt; </a>()<span class="keyword"> const</span>
<a name="l00126"></a>00126 <span class="keyword">    </span>{ <span class="keywordflow">return</span> &amp;(<a class="code" href="classCS_1_1CowWrapper.html#803d8ead4e91477282bcc9e6ec4c794d" title="Return a const reference to the contained data.">operator*</a>()); }
<a name="l00132"></a><a class="code" href="classCS_1_1CowWrapper.html#071b643a9ec30d989db6fcb68e3a4acf">00132</a>     T* <a class="code" href="classCS_1_1CowWrapper.html#5a11d334c8fc1946bc530e8ad8ff3959" title="Return a const pointer to the contained data.">operator -&gt; </a>()
<a name="l00133"></a>00133     { <span class="keywordflow">return</span> &amp;(<a class="code" href="classCS_1_1CowWrapper.html#803d8ead4e91477282bcc9e6ec4c794d" title="Return a const reference to the contained data.">operator*</a>()); }
<a name="l00134"></a>00134   };
<a name="l00135"></a>00135 
<a name="l00136"></a>00136 } <span class="comment">// namespace CS</span>
<a name="l00137"></a>00137 
<a name="l00138"></a>00138 <span class="preprocessor">#include "<a class="code" href="custom__new__enable_8h.html" title="Include file to re-enable CrystalSpace&amp;#39;s &amp;#39;operator new&amp;#39; override after...">csutil/custom_new_enable.h</a>"</span>
<a name="l00139"></a>00139 
<a name="l00140"></a>00140 <span class="preprocessor">#endif // __CS_CSUTIL_COWWRAPPER_H__</span>
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