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<title>Macro BOOST_VMD_IS_NUMBER</title>
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<h2><span class="refentrytitle">Macro BOOST_VMD_IS_NUMBER</span></h2>
<p>BOOST_VMD_IS_NUMBER &#8212; Tests whether a sequence is a Boost PP number. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="header/boost/vmd/is_number_hpp.html" title="Header &lt;boost/vmd/is_number.hpp&gt;">boost/vmd/is_number.hpp</a>&gt;

</span>BOOST_VMD_IS_NUMBER(sequence)</pre></div>
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<a name="idm45529680684496"></a><h2>Description</h2>
<p>The macro checks to see if a sequence is a Boost PP number. A Boost PP number is a value from 0 to 256.</p>
<p>sequence = a possible number</p>
<p>returns = 1 if the sequence is a Boost PP number, 0 if it is not.</p>
<p>If the input is not a VMD data type this macro could lead to a preprocessor error. This is because the macro uses preprocessor concatenation to determine if the input is a number once it is determined that the input does not start with parenthesis. If the data being concatenated would lead to an invalid preprocessor token the compiler can issue a preprocessor error. </p>
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