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boost 2: shared_ptr wraps resource handles

, 16 Nov 2004
Using boost, we can write "almost perfect" wrappers for GDI and other resource handles, in a few lines of code.
handleref.zip
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HandleRef
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<h1>handleref.h</h1><a href="handleref_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <span class="comment">// ==================================================================</span>
00002 <span class="comment">// </span>
00003 <span class="comment">//  handleref.h</span>
00004 <span class="comment">//  </span>
00005 <span class="comment">//  Created:       03.10.2004</span>
00006 <span class="comment">//</span>
00007 <span class="comment">//  Copyright (C) Peter Hauptmann 2004</span>
00008 <span class="comment">//              </span>
00009 <span class="comment">// ------------------------------------------------------------------</span>
00043 <span class="comment"></span>
00044 <span class="preprocessor">#ifndef FILE_PH_HANDLEREF_H_200427719_INCLUDED_</span>
00045 <span class="preprocessor"></span><span class="preprocessor">#define FILE_PH_HANDLEREF_H_200427719_INCLUDED_</span>
00046 <span class="preprocessor"></span>
00047 <span class="preprocessor">#if _MSC_VER &gt; 1000</span>
00048 <span class="preprocessor"></span><span class="preprocessor">#pragma once</span>
00049 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00050 <span class="preprocessor"></span>
00051 <span class="comment">// boost::shared_ptr is required for this file, see boost.org for details</span>
00052 <span class="preprocessor">#include &lt;boost/shared_ptr.hpp&gt;</span> 
00053 
00054 <span class="comment">// ==================================================================</span>
00055 <span class="comment">//  namespace nsHandleRefDetail</span>
00056 <span class="comment">// ------------------------------------------------------------------</span>
<a name="l00065"></a><a class="code" href="namespacensHandleRefDetail.html">00065</a> <span class="comment"></span><span class="keyword">namespace </span>nsHandleRefDetail
00066 {
00067 
<a name="l00069"></a><a class="code" href="structnsHandleRefDetail_1_1CDeleterVoid.html">00069</a> <span class="keyword">struct </span><a class="code" href="structnsHandleRefDetail_1_1CDeleterVoid.html">CDeleterVoid</a>
00070 {
<a name="l00071"></a><a class="code" href="structnsHandleRefDetail_1_1CDeleterVoid.html#a0">00071</a>     <span class="keywordtype">void</span> <a class="code" href="structnsHandleRefDetail_1_1CDeleterVoid.html#a0">operator()</a>(<span class="keywordtype">void</span> * p) { }
00072 };
00073 
<a name="l00075"></a><a class="code" href="structnsHandleRefDetail_1_1CDeleterGDI.html">00075</a> <span class="keyword">struct </span><a class="code" href="structnsHandleRefDetail_1_1CDeleterGDI.html">CDeleterGDI</a>
00076 {
<a name="l00077"></a><a class="code" href="structnsHandleRefDetail_1_1CDeleterGDI.html#a0">00077</a>     <span class="keywordtype">void</span> <a class="code" href="structnsHandleRefDetail_1_1CDeleterGDI.html#a0">operator()</a>(<span class="keywordtype">void</span> * p) { DeleteObject(p); }
00078 };
00079 
<a name="l00081"></a><a class="code" href="structnsHandleRefDetail_1_1CDeleterImageList.html">00081</a> <span class="keyword">struct </span><a class="code" href="structnsHandleRefDetail_1_1CDeleterImageList.html">CDeleterImageList</a>
00082 {
<a name="l00083"></a><a class="code" href="structnsHandleRefDetail_1_1CDeleterImageList.html#a0">00083</a>     <span class="keywordtype">void</span> <a class="code" href="structnsHandleRefDetail_1_1CDeleterImageList.html#a0">operator()</a>(<span class="keywordtype">void</span> * p) { ImageList_Destroy( (HIMAGELIST) p); }
00084 };
00085 
<a name="l00087"></a><a class="code" href="structnsHandleRefDetail_1_1CDeleterHMENU.html">00087</a> <span class="keyword">struct </span><a class="code" href="structnsHandleRefDetail_1_1CDeleterHMENU.html">CDeleterHMENU</a>
00088 {
<a name="l00089"></a><a class="code" href="structnsHandleRefDetail_1_1CDeleterHMENU.html#a0">00089</a>     <span class="keywordtype">void</span> <a class="code" href="structnsHandleRefDetail_1_1CDeleterHMENU.html#a0">operator()</a>(<span class="keywordtype">void</span> * p) { DeleteMenu((HMENU) p); }
00090 };
00091 
00092 
<a name="l00094"></a><a class="code" href="structnsHandleRefDetail_1_1CDeleterHANDLE.html">00094</a> <span class="keyword">struct </span><a class="code" href="structnsHandleRefDetail_1_1CDeleterHANDLE.html">CDeleterHANDLE</a>
00095 {
<a name="l00096"></a><a class="code" href="structnsHandleRefDetail_1_1CDeleterHANDLE.html#a0">00096</a>     <span class="keywordtype">void</span> <a class="code" href="structnsHandleRefDetail_1_1CDeleterHANDLE.html#a0">operator()</a>(<span class="keywordtype">void</span> * p) { CloseHandle( (HANDLE) p); }
00097 };
00098 
00099 
00100 } <span class="comment">// namespace nsHandleRef_Detail</span>
00101 
00102 
00103 
00104 <span class="comment">// ==================================================================</span>
00105 <span class="comment">//  CHandleRefT::</span>
00106 <span class="comment">// ------------------------------------------------------------------</span>
00137 <span class="comment"></span><span class="keyword">template</span> &lt;<span class="keyword">class</span> HDL, <span class="keyword">class</span> DELETER&gt;
<a name="l00138"></a><a class="code" href="classCHandleRefT.html">00138</a> <span class="keyword">class </span><a class="code" href="classCHandleRefT.html">CHandleRefT</a>
00139 {
00140 <span class="keyword">protected</span>:
<a name="l00141"></a><a class="code" href="classCHandleRefT.html#x0">00141</a>     <span class="keyword">typedef</span> boost::shared_ptr&lt;void&gt; <a class="code" href="classCHandleRefT.html#x0">tBoostSP</a>;
<a name="l00142"></a><a class="code" href="classCHandleRefT.html#p0">00142</a>     <a class="code" href="classCHandleRefT.html#x0">tBoostSP</a> <a class="code" href="classCHandleRefT.html#p0">m_ptr</a>;
00143 
00144 <span class="keyword">public</span>:
00145 
<a name="l00147"></a><a class="code" href="classCHandleRefT.html#a0">00147</a>     <a class="code" href="classCHandleRefT.html#a0">CHandleRefT</a>() {}
00148 
<a name="l00153"></a><a class="code" href="classCHandleRefT.html#a1">00153</a>     <span class="keyword">explicit</span> <a class="code" href="classCHandleRefT.html#a0">CHandleRefT</a>(HDL h, <span class="keywordtype">bool</span> deleteOnRelease)
00154     {
00155         <span class="keywordflow">if</span> (deleteOnRelease)
00156             <a class="code" href="classCHandleRefT.html#p0">m_ptr</a> = <a class="code" href="classCHandleRefT.html#x0">tBoostSP</a>(h, DELETER());
00157         <span class="keywordflow">else</span>
00158             <a class="code" href="classCHandleRefT.html#p0">m_ptr</a> = <a class="code" href="classCHandleRefT.html#x0">tBoostSP</a>(h, <a class="code" href="structnsHandleRefDetail_1_1CDeleterVoid.html">nsHandleRefDetail::CDeleterVoid</a>());
00159     }
00160 
<a name="l00162"></a><a class="code" href="classCHandleRefT.html#a2">00162</a>     <a class="code" href="classCHandleRefT.html#a2">operator HDL</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> (HDL) <a class="code" href="classCHandleRefT.html#p0">m_ptr</a>.get(); }
00163 };
00164 
00165 
00166 
<a name="l00167"></a><a class="code" href="handleref_8h.html#a0">00167</a> <span class="keyword">typedef</span> <a class="code" href="classCHandleRefT.html">CHandleRefT&lt;HIMAGELIST, nsHandleRefDetail::CDeleterImageList&gt;</a> <a class="code" href="classCHandleRefT.html">CImageListRef</a>;
<a name="l00168"></a><a class="code" href="handleref_8h.html#a1">00168</a> <span class="keyword">typedef</span> <a class="code" href="classCHandleRefT.html">CHandleRefT&lt;HBITMAP, nsHandleRefDetail::CDeleterGDI&gt;</a> <a class="code" href="classCHandleRefT.html">CBitmapRef</a>;
00169 <span class="keyword">typedef</span> <a class="code" href="classCHandleRefT.html">CHandleRefT&lt;HBITMAP, nsHandleRefDetail::CDeleterGDI&gt;</a> <a class="code" href="handleref_8h.html#a1">CBitmapRef</a>;
<a name="l00170"></a><a class="code" href="handleref_8h.html#a2">00170</a> <span class="keyword">typedef</span> <a class="code" href="classCHandleRefT.html">CHandleRefT&lt;HBRUSH, nsHandleRefDetail::CDeleterGDI&gt;</a> <a class="code" href="classCHandleRefT.html">CBrushRef</a>;
<a name="l00171"></a><a class="code" href="handleref_8h.html#a3">00171</a> <span class="keyword">typedef</span> <a class="code" href="classCHandleRefT.html">CHandleRefT&lt;HPEN, nsHandleRefDetail::CDeleterGDI&gt;</a> <a class="code" href="classCHandleRefT.html">CPenRef</a>;
<a name="l00172"></a><a class="code" href="handleref_8h.html#a4">00172</a> <span class="keyword">typedef</span> <a class="code" href="classCHandleRefT.html">CHandleRefT&lt;HANDLE, nsHandleRefDetail::CDeleterHANDLE&gt;</a> <a class="code" href="classCHandleRefT.html">CHandleRef</a>;
<a name="l00173"></a><a class="code" href="handleref_8h.html#a5">00173</a> <span class="keyword">typedef</span> <a class="code" href="classCHandleRefT.html">CHandleRefT&lt;HMENU, nsHandleRefDetail::CDeleterHMENU&gt;</a> <a class="code" href="classCHandleRefT.html">CMenuRef</a>;
00174 
00175 
00224 <span class="preprocessor">#endif // FILE_PH_HANDLEREF_H_200427719_INCLUDED_</span>
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