(d, sequence)</pre></div>
<div class="refsect1">
<a name="idm44895634345536"></a><h2>Description</h2>
<p>d = The next available BOOST_PP_WHILE iteration. sequence = a sequence</p>
<p>returns = 1 if the sequence is a single-element sequence, else returns 0.</p>
<p>If the size of a sequence is known it is faster comparing that size to be equal to one to find out if the sequence is single-element. But if the size of the sequence is not known it is faster calling this macro than getting the size and doing the p