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boost 2: shared_ptr wraps resource handles

By , 16 Nov 2004
 
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<title>HandleRef: CDCRef class Reference</title>
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<h1>CDCRef Class Reference</h1><code>#include &lt;<a class="el" href="handleref_8h-source.html">handleref.h</a>&gt;</code>
<p>
<hr><a name="_details"></a><h2>Detailed Description</h2>
HDC needs special handling, since there are two valid cleanups - DeleteDC - ReleaseDC. 
<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00198">198</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.<table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#a0">CDCRef</a> ()</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">creates a null handle  <a href="#a0"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#a1">operator HDC</a> () const </td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">retrieve a device context handle  <a href="#a1"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#a2">CDCRef</a> (HDC dc, bool deleteOnRelease)</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">initializes the handler For the second parameter, you can specify: - <a class="el" href="classCDCRef.html#x1">CDCRef::Null</a> for a null deleter (handle is not destroyed) - <a class="el" href="classCDCRef.html#x2">CDCRef::Delete</a> to call DeleteDC (when the handle was acquired by CreateDC) - <a class="el" href="classCDCRef.html#x3">CDCRef::Release</a> to call ReleaseDC (when the handle was acquired by GetDC)  <a href="#a2"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#a3">CDCRef</a> (HWND wnd, HDC dc, bool releaseOnRelease)</td></tr>

<tr><td colspan=2><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="classCDCRef.html">CDCRef</a>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#e0">GetDC</a> (HWND wnd)</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">implements GetDC, returning a valid CDCRef for more information, see MSDN: GetDC  <a href="#e0"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="classCDCRef.html">CDCRef</a>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#e1">GetDCEx</a> (HWND wnd, HRGN rgnClip, DWORD flags)</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">implements GetDC, returning a valid CDCRef for more information, see MSDN: GetDCEx  <a href="#e1"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="classCDCRef.html">CDCRef</a>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#e2">GetWindowDC</a> (HWND wnd)</td></tr>

<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="classCDCRef.html">CDCRef</a>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#e3">CreateDC</a> (LPCTSTR lpszDriver, LPCTSTR lpszDevice, LPCTSTR lpszOutput, CONST DEVMODE *lpInitData, bool infoDCOnly=false)</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">implements CreateDC / CreateIC, returning a valid CDCRef for more information, see MSDN: CreateDC specify idonDCOnly=true to call CreateIC instead of CreateDC.  <a href="#e3"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="classCDCRef.html">CDCRef</a>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#e4">CreateCompatibleDC</a> (HDC dc)</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">implements CreateCompatibleDC, returning a valid CDCRef for more information, see MSDN: CreateCompatibleDC  <a href="#e4"></a><br><br></td></tr>
<tr><td colspan=2><br><h2>Protected Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>typedef boost::shared_ptr&lt;<br>
 void &gt;&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#x0">tBoostSP</a></td></tr>

<tr><td class="memItemLeft" nowrap align=right valign=top>typedef <a class="el" href="structnsHandleRefDetail_1_1CDeleterVoid.html">nsHandleRefDetail::CDeleterVoid</a>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#x1">Null</a></td></tr>

<tr><td class="memItemLeft" nowrap align=right valign=top>typedef <a class="el" href="structnsHandleRefDetail_1_1CDeleterDeleteDC.html">nsHandleRefDetail::CDeleterDeleteDC</a>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#x2">Delete</a></td></tr>

<tr><td class="memItemLeft" nowrap align=right valign=top>typedef <a class="el" href="structnsHandleRefDetail_1_1CDeleterReleaseDC.html">nsHandleRefDetail::CDeleterReleaseDC</a>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#x3">Release</a></td></tr>

<tr><td colspan=2><br><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="classCDCRef.html#x0">tBoostSP</a>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="classCDCRef.html#p0">m_ptr</a></td></tr>

</table>
<hr><h2>Member Typedef Documentation</h2>
<a class="anchor" name="x0" doxytag="CDCRef::tBoostSP" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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          <td class="md" nowrap valign="top"> typedef boost::shared_ptr&lt;void&gt; <a class="el" href="classCDCRef.html#x0">CDCRef::tBoostSP</a><code> [protected]</code>
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    <td>
      &nbsp;
    </td>
    <td>

<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00201">201</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<a class="anchor" name="x1" doxytag="CDCRef::Null" ></a><p>
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          <td class="md" nowrap valign="top"> typedef <a class="el" href="structnsHandleRefDetail_1_1CDeleterVoid.html">nsHandleRefDetail::CDeleterVoid</a> <a class="el" href="structnsHandleRefDetail_1_1CDeleterVoid.html">CDCRef::Null</a><code> [protected]</code>
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    <td>
      &nbsp;
    </td>
    <td>

<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00204">204</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<a class="anchor" name="x2" doxytag="CDCRef::Delete" ></a><p>
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          <td class="md" nowrap valign="top"> typedef <a class="el" href="structnsHandleRefDetail_1_1CDeleterDeleteDC.html">nsHandleRefDetail::CDeleterDeleteDC</a> <a class="el" href="structnsHandleRefDetail_1_1CDeleterDeleteDC.html">CDCRef::Delete</a><code> [protected]</code>
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      &nbsp;
    </td>
    <td>

<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00205">205</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<a class="anchor" name="x3" doxytag="CDCRef::Release" ></a><p>
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          <td class="md" nowrap valign="top"> typedef <a class="el" href="structnsHandleRefDetail_1_1CDeleterReleaseDC.html">nsHandleRefDetail::CDeleterReleaseDC</a> <a class="el" href="structnsHandleRefDetail_1_1CDeleterReleaseDC.html">CDCRef::Release</a><code> [protected]</code>
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      &nbsp;
    </td>
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<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00206">206</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<hr><h2>Constructor &amp; Destructor Documentation</h2>
<a class="anchor" name="a0" doxytag="CDCRef::CDCRef" ></a><p>
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          <td class="md" nowrap valign="top"> CDCRef::CDCRef </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline]</code></td>
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<p>
creates a null handle 
<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00211">211</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<a class="anchor" name="a2" doxytag="CDCRef::CDCRef" ></a><p>
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          <td class="md" nowrap valign="top"> CDCRef::CDCRef </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">HDC&nbsp;</td>
          <td class="mdname" nowrap> <em>dc</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>bool&nbsp;</td>
          <td class="mdname" nowrap> <em>deleteOnRelease</em></td>
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          <td></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"><code> [inline]</code></td>
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      &nbsp;
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    <td>

<p>
initializes the handler For the second parameter, you can specify: - <a class="el" href="classCDCRef.html#x1">CDCRef::Null</a> for a null deleter (handle is not destroyed) - <a class="el" href="classCDCRef.html#x2">CDCRef::Delete</a> to call DeleteDC (when the handle was acquired by CreateDC) - <a class="el" href="classCDCRef.html#x3">CDCRef::Release</a> to call ReleaseDC (when the handle was acquired by GetDC) 
<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00223">223</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<a class="anchor" name="a3" doxytag="CDCRef::CDCRef" ></a><p>
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          <td class="md" nowrap valign="top"> CDCRef::CDCRef </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">HWND&nbsp;</td>
          <td class="mdname" nowrap> <em>wnd</em>, </td>
        </tr>
        <tr>
          <td></td>
          <td></td>
          <td class="md" nowrap>HDC&nbsp;</td>
          <td class="mdname" nowrap> <em>dc</em>, </td>
        </tr>
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          <td></td>
          <td></td>
          <td class="md" nowrap>bool&nbsp;</td>
          <td class="mdname" nowrap> <em>releaseOnRelease</em></td>
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          <td></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"><code> [inline]</code></td>
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<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00229">229</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="a1" doxytag="CDCRef::operator HDC" ></a><p>
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          <td class="md" nowrap valign="top"> CDCRef::operator HDC </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const<code> [inline]</code></td>
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retrieve a device context handle 
<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00214">214</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<a class="anchor" name="e0" doxytag="CDCRef::GetDC" ></a><p>
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          <td class="md" nowrap valign="top"> <a class="el" href="classCDCRef.html">CDCRef</a> CDCRef::GetDC </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">HWND&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>wnd</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline, static]</code></td>
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implements GetDC, returning a valid CDCRef for more information, see MSDN: GetDC 
<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00237">237</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<a class="anchor" name="e1" doxytag="CDCRef::GetDCEx" ></a><p>
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          <td class="md" nowrap valign="top"> <a class="el" href="classCDCRef.html">CDCRef</a> CDCRef::GetDCEx </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">HWND&nbsp;</td>
          <td class="mdname" nowrap> <em>wnd</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>HRGN&nbsp;</td>
          <td class="mdname" nowrap> <em>rgnClip</em>, </td>
        </tr>
        <tr>
          <td></td>
          <td></td>
          <td class="md" nowrap>DWORD&nbsp;</td>
          <td class="mdname" nowrap> <em>flags</em></td>
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          <td></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"><code> [inline, static]</code></td>
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<p>
implements GetDC, returning a valid CDCRef for more information, see MSDN: GetDCEx 
<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00244">244</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<a class="anchor" name="e2" doxytag="CDCRef::GetWindowDC" ></a><p>
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          <td class="md" nowrap valign="top"> <a class="el" href="classCDCRef.html">CDCRef</a> CDCRef::GetWindowDC </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">HWND&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>wnd</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline, static]</code></td>
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<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00249">249</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
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<a class="anchor" name="e3" doxytag="CDCRef::CreateDC" ></a><p>
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      <table cellpadding="0" cellspacing="0" border="0">
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          <td class="md" nowrap valign="top"> <a class="el" href="classCDCRef.html">CDCRef</a> CDCRef::CreateDC </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">LPCTSTR&nbsp;</td>
          <td class="mdname" nowrap> <em>lpszDriver</em>, </td>
        </tr>
        <tr>
          <td></td>
          <td></td>
          <td class="md" nowrap>LPCTSTR&nbsp;</td>
          <td class="mdname" nowrap> <em>lpszDevice</em>, </td>
        </tr>
        <tr>
          <td></td>
          <td></td>
          <td class="md" nowrap>LPCTSTR&nbsp;</td>
          <td class="mdname" nowrap> <em>lpszOutput</em>, </td>
        </tr>
        <tr>
          <td></td>
          <td></td>
          <td class="md" nowrap>CONST DEVMODE *&nbsp;</td>
          <td class="mdname" nowrap> <em>lpInitData</em>, </td>
        </tr>
        <tr>
          <td></td>
          <td></td>
          <td class="md" nowrap>bool&nbsp;</td>
          <td class="mdname" nowrap> <em>infoDCOnly</em> = false</td>
        </tr>
        <tr>
          <td></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"><code> [inline, static]</code></td>
        </tr>

      </table>
    </td>
  </tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
  <tr>
    <td>
      &nbsp;
    </td>
    <td>

<p>
implements CreateDC / CreateIC, returning a valid CDCRef for more information, see MSDN: CreateDC specify idonDCOnly=true to call CreateIC instead of CreateDC. 
<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00259">259</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
  </tr>
</table>
<a class="anchor" name="e4" doxytag="CDCRef::CreateCompatibleDC" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
  <tr>
    <td class="mdRow">
      <table cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td class="md" nowrap valign="top"> <a class="el" href="classCDCRef.html">CDCRef</a> CDCRef::CreateCompatibleDC </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">HDC&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>dc</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline, static]</code></td>
        </tr>

      </table>
    </td>
  </tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
  <tr>
    <td>
      &nbsp;
    </td>
    <td>

<p>
implements CreateCompatibleDC, returning a valid CDCRef for more information, see MSDN: CreateCompatibleDC 
<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00272">272</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
  </tr>
</table>
<hr><h2>Field Documentation</h2>
<a class="anchor" name="p0" doxytag="CDCRef::m_ptr" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
  <tr>
    <td class="mdRow">
      <table cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td class="md" nowrap valign="top"> <a class="el" href="classCDCRef.html#x0">tBoostSP</a> <a class="el" href="classCDCRef.html#p0">CDCRef::m_ptr</a><code> [protected]</code>
      </table>
    </td>
  </tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
  <tr>
    <td>
      &nbsp;
    </td>
    <td>

<p>

<p>
Definition at line <a class="el" href="handleref_8h-source.html#l00202">202</a> of file <a class="el" href="handleref_8h-source.html">handleref.h</a>.    </td>
  </tr>
</table>
<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="handleref_8h-source.html">handleref.h</a></ul>
<hr size="1"><address style="align: right;"><small>Generated on Tue Nov 16 22:21:51 2004 for HandleRef by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border=0 > 
</a>1.3.5 </small></address>
</body>
</html>

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 peterchen
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Peter is tired of being called "Mr. Chen", even so certain individuals insist on it. No, he's not chinese.
 
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About Article
Using boost, we can write "almost perfect" wrappers for GDI and other resource handles, in a few lines of code.
Type Article
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First Posted 4 Oct 2004
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