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<h2><span class="refentrytitle">Macro BOOST_VMD_IS_PARENS_EMPTY_D</span></h2>
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<p>BOOST_VMD_IS_PARENS_EMPTY_D — Determines if the sequence is a set of parens with no data. Re-entrant version. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
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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_parens_empty_hpp.html" title="Header <boost/vmd/is_parens_empty.hpp>">boost/vmd/is_parens_empty.hpp</a>>
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</span>BOOST_VMD_IS_PARENS_EMPTY_D(d, sequence)</pre></div>
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<a name="idm45711064663424"></a><h2>Description</h2>
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<p>d = The next available BOOST_PP_WHILE iteration. <br>
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sequence = a VMD sequence</p>
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<p>returns = 1 if the sequence is a set of parens with no data, else returns 0.</p>
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<pre class="programlisting"><span class="identifier">A</span> <span class="identifier">set</span> <span class="identifier">of</span> <span class="identifier">parens</span> <span class="identifier">with</span> <span class="identifier">no</span> <span class="identifier">data</span> <span class="identifier">may</span> <span class="identifier">be</span><span class="special">:</span>
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<span class="number">1</span><span class="special">)</span> <span class="identifier">a</span> <span class="identifier">tuple</span> <span class="identifier">whose</span> <span class="identifier">size</span> <span class="identifier">is</span> <span class="identifier">a</span> <span class="identifier">single</span> <span class="identifier">element</span> <span class="identifier">which</span> <span class="identifier">is</span> <span class="identifier">empty</span>
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<span class="identifier">or</span>
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<span class="number">2</span><span class="special">)</span> <span class="identifier">a</span> <span class="identifier">single</span> <span class="identifier">element</span> <span class="identifier">seq</span> <span class="identifier">whose</span> <span class="identifier">data</span> <span class="identifier">is</span> <span class="identifier">empty</span>
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