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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="variadic_macro_data.vmd_vc"></a><a class="link" href="vmd_vc.html" title="Visual C++ define">Visual C++ define</a>
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<p>
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Microsoft's Visual C++ compiler, abbreviated VC++, is a very popular compiler
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but does not implement the standard C++ preprocessor correctly in a number
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of respects in its default preprocessor. Because of this the programmer using
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the VMD needs to occasionally do things differently when VC++ is being used.
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These "quirks" of VC++ have been smoothed over as much as possible
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in the VMD library, but are mentioned in further topics and occasionally must
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be addressed by the programmer using VMD.
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</p>
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<p>
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The VMD has a macro that indicates when the VC++ default preprocessor is being
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used. The macro is an object-like macro called BOOST_VMD_MSVC. It is set to
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1 when VC++'s default preprocessor is being used and set to 0 when VC++'s default
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preprocessore is not being used. You can use this macro in your own macro code
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whenever you include a VMD header file to write code which may need special
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processing for VC++ as outlined in this documentation. Your macro processing
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may therefore occasional take the form of:
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</p>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">vmd</span><span class="special">/</span><span class="identifier">some_header</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="preprocessor">#if</span> <span class="identifier">BOOST_VMD_MSVC</span>
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<span class="preprocessor">#define</span> <span class="identifier">SOME_MACRO</span> <span class="special">...</span> <span class="identifier">code</span> <span class="keyword">for</span> <span class="identifier">VC</span><span class="special">++</span> <span class="keyword">using</span> <span class="identifier">its</span> <span class="keyword">default</span> <span class="identifier">preprocessor</span>
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<span class="preprocessor">#else</span>
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<span class="preprocessor">#define</span> <span class="identifier">SOME_MACRO</span> <span class="special">...</span> <span class="identifier">code</span> <span class="keyword">for</span> <span class="identifier">all</span> <span class="identifier">other</span> <span class="identifier">compilers</span>
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<span class="preprocessor">#endif</span>
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</pre>
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<p>
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The BOOST_VMD_MSVC macro only applies when the VC++ default preprocessor is
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being used. It does not apply when VC++'s new standard conforming preprocessor,
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currently activated by the <code class="computeroutput"><span class="special">/</span><span class="identifier">Zc</span><span class="special">:</span><span class="identifier">preprocessor</span></code>
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command line option, is being used.
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East Inc</div></td>
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