Description

The macro checks to see if the input is empty or not. It returns 1 if the input is empty, else returns 0.

The macro is a variadic macro taking any input and works through variadic macro support.

The macro is not perfect, and can not be so. The problem area is if the input to be checked is a function-like macro name, in which case either a compiler error can result or a false result can occur.

This macro is a replacement, using variadic macro support, for the undocumented macro BOOST_PP_IS_EMPTY in the Boost pplib. The code is taken from a posting by Paul Mensonides of a variadic version for BOOST_PP_IS_EMPTY, and changed in order to also support VC++.

.... = variadic input

returns = 1 if the input is empty, 0 if it is not

It is recommended to append BOOST_PP_EMPTY() to whatever input is being tested in order to avoid possible warning messages from some compilers about no parameters being passed to the macro when the input is truly empty.