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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>
      Microsoft's Visual C++ compiler, abbreviated VC++, is a very popular compiler
      but does not implement the standard C++ preprocessor correctly in a number
      of respects. Because of this the programmer using the VMD needs to occasionally
      do things differently when VC++ is being used. These "quirks" of
      VC++ have been smoothed over as much as possible in the VMD library, but are
      mentioned in further topics and occasionally must be addressed by the programmer
      using VMD.
    </p>
<p>
      The VMD has a macro that indicates when VC++ is the compiler being used. The
      macro is an object-like macro called BOOST_VMD_MSVC. It is set to 1 when VC++
      is being used and set to 0 when VC++ is not being used. You can use this macro
      in your own macro code whenever you include a VMD header file to write code
      which may need special processing for VC++ as outlined in this documentation.
      Your macro processing may therefore occasional take the form of:
    </p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>

<span class="preprocessor">#if</span> <span class="identifier">BOOST_VMD_MSVC</span>

<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="preprocessor">#else</span>

<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>

<span class="preprocessor">#endif</span>
</pre>
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