Macro BOOST_VMD_IS_PARENS_EMPTY
BOOST_VMD_IS_PARENS_EMPTY — Determines if the input is a set of parens with no data.
Synopsis
BOOST_VMD_IS_PARENS_EMPTY(param)
Description
param = a macro parameter.
returns = 1 if the input is a set of parens with no data, else returns 0.
A set of parens with no data may be:
1) a tuple whose size is a single element which is empty or
2) a single element seq whose data is empty