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<h2><span class="refentrytitle">Macro BOOST_VMD_IS_ARRAY_D</span></h2>
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<p>BOOST_VMD_IS_ARRAY_D — Determines if a sequence is a Boost PP array. Re-entrant version. </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_array_hpp.html" title="Header <boost/vmd/is_array.hpp>">boost/vmd/is_array.hpp</a>>
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</span>BOOST_VMD_IS_ARRAY_D(d, sequence)</pre></div>
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<a name="idm45711064937488"></a><h2>Description</h2>
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<p>The macro checks that the sequence is a Boost PP array. It returns 1 if it is an array, else if returns 0.</p>
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<p>d = The next available BOOST_PP_WHILE iteration. <br>
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sequence = a possible Boost PP array.</p>
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<p>returns = 1 if it is an array, else returns 0.</p>
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<p>The macro will generate a preprocessing error if the input 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 '(&2,(0,1))' which is a valid tuple but an invalid array. </p>
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