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<h2><span class="refentrytitle">Macro BOOST_VMD_IS_EMPTY_ARRAY</span></h2>
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<p>BOOST_VMD_IS_EMPTY_ARRAY — Tests whether a sequence is an empty Boost PP array. </p>
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<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="header/boost/vmd/is_empty_array_hpp.html" title="Header <boost/vmd/is_empty_array.hpp>">boost/vmd/is_empty_array.hpp</a>>
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</span>BOOST_VMD_IS_EMPTY_ARRAY(sequence)</pre></div>
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<div class="refsect1">
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<a name="idm45711064907344"></a><h2>Description</h2>
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<p>An empty Boost PP array is a two element tuple where the first size element is 0 and the second element is a tuple with a single empty element, ie. '(0,())'.</p>
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<p>sequence = a possible empty array</p>
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<p>returns = 1 if the sequence is an empty Boost PP array, 0 if it is not.</p>
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<p>The macro will generate a preprocessing error if the sequence is in the form of an array but its first tuple element, instead of being a number, is a preprocessor token which VMD cannot parse, as in the example '(&0,())' which is a valid tuple but an invalid array. </p>
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