BOOST_PP_LIST_IS

The BOOST_PP_LIST_IS_CONS macro is a predicate that determines if a list not nil.

Usage

BOOST_PP_LIST_IS_CONS(list)

Arguments

list: A list.

Remarks

If list is non-nil, this macro expands to 1. Otherwise, it expands to 0.

Requirements

Header: <boost/preprocessor/list/adt.hpp>

Sample Code

#include <boost/preprocessor/list/adt.hpp>

#define LIST (a, BOOST_PP_NIL)

BOOST_PP_LIST_IS_CONS(LIST) // expands to 1
BOOST_PP_LIST_IS_CONS(BOOST_PP_LIST_REST(LIST)) // expands to 0