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BOOST_VMD_TUPLE — Expands to a tuple of the beginning tuple, and the preprocessor tokens after the beginning tuple, of a macro parameter.
// In header: <boost/vmd/tuple.hpp>
BOOST_VMD_TUPLE(param)param = a macro parameter.
returns = the result is a tuple of two elements. If the param does not start with a tuple, both elements of the tuple are empty. If the param does start with a tuple, the first element is the beginning tuple and the second element is the preprocessor tokens after the beginning tuple.