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BOOST_VMD_IS_NUMBER — Tests whether a parameter is a Boost PP number.
// In header: <boost/vmd/is_number.hpp>
BOOST_VMD_IS_NUMBER(ppident)The macro checks to see if a parameter is a Boost PP number. A Boost PP number is a value from 0 to 256.
ppident = a preprocessor identifier
returns = 1 if the param is a Boost PP number, 0 if it is not.
The macro works through variadic macro support. The ppident can be either:
1) A preprocessor identifier, alphanumeric or underscore characters. 2) An empty value, returns 0. 3) A set of beginning parens, returns 0.
If it is not one of these possibilities a compiler error will occur.