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<h2><span class="refentrytitle">Macro BOOST_VMD_ASSERT_IS_NUMBER</span></h2>
<p>BOOST_VMD_ASSERT_IS_NUMBER — Asserts that the sequence is a 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/assert_is_number_hpp.html" title="Header &lt;boost/vmd/assert_is_number.hpp&gt;">boost/vmd/assert_is_number.hpp</a>&gt;
</span>BOOST_VMD_ASSERT_IS_NUMBER(sequence)</pre></div>
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<a name="idm45711066183824"></a><h2>Description</h2>
<p>The macro checks that the parameter is a number. If it is not a number, it forces a compiler error.</p>
<p>The macro normally checks for a number only in debug mode. However an end-user can force the macro to check or not check by defining the macro BOOST_VMD_ASSERT_DATA to 1 or 0 respectively.</p>
<p>sequence = a possible number.</p>
<pre class="programlisting"><span class="identifier">returns</span> <span class="special">=</span> <span class="identifier">Normally</span> <span class="identifier">the</span> <span class="identifier">macro</span> <span class="identifier">returns</span> <span class="identifier">nothing</span><span class="special">.</span>
<span class="identifier">If</span> <span class="identifier">the</span> <span class="identifier">sequence</span> <span class="identifier">is</span> <span class="identifier">a</span> <span class="identifier">number</span><span class="special">,</span> <span class="identifier">nothing</span> <span class="identifier">is</span>
<span class="identifier">output</span><span class="special">.</span>
<span class="identifier">For</span> <span class="identifier">VC</span><span class="special">++</span><span class="special">,</span> <span class="identifier">because</span> <span class="identifier">there</span> <span class="identifier">is</span> <span class="identifier">no</span> <span class="identifier">sure</span> <span class="identifier">way</span> <span class="identifier">of</span> <span class="identifier">forcing</span>
<span class="identifier">a</span> <span class="identifier">compiler</span> <span class="identifier">error</span> <span class="identifier">from</span> <span class="identifier">within</span> <span class="identifier">a</span> <span class="identifier">macro</span> <span class="identifier">without</span> <span class="identifier">producing</span>
<span class="identifier">output</span><span class="special">,</span> <span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">sequence</span> <span class="identifier">is</span> <span class="identifier">not</span> <span class="identifier">a</span> <span class="identifier">number</span> <span class="identifier">the</span>
<span class="identifier">macro</span> <span class="identifier">forces</span> <span class="identifier">a</span> <span class="identifier">compiler</span> <span class="identifier">error</span> <span class="identifier">by</span> <span class="identifier">outputting</span> <span class="identifier">invalid</span> <span class="identifier">C</span><span class="special">++</span><span class="special">.</span>
<span class="identifier">For</span> <span class="identifier">all</span> <span class="identifier">other</span> <span class="identifier">compilers</span> <span class="identifier">a</span> <span class="identifier">compiler</span> <span class="identifier">error</span> <span class="identifier">is</span> <span class="identifier">forced</span>
<span class="identifier">without</span> <span class="identifier">producing</span> <span class="identifier">output</span> <span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">sequence</span> <span class="identifier">is</span> <span class="identifier">not</span> <span class="identifier">a</span>
<span class="identifier">number</span><span class="special">.</span>
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