 is a Boost PP seq. It returns 1 if it is a seq, else if returns 0.</p>
<p>sequence = a possible Boost PP seq</p>
<p>returns = 1 if it a seq, else returns 0.</p>
<p>A single set of parentheses, with a single element, is parsed as a tuple and not a seq. To be parsed as a seq the input needs to be more than one consecutive sets of parentheses, each with a single element of data. </p>
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