The BOOST_PP_TUPLE_EAT macro expands to a macro that eats a tuple.

Usage

BOOST_PP_TUPLE_EAT() (v)

or

BOOST_PP_TUPLE_EAT(size) (v)

Arguments

size
The size of the tuple to be eaten.  The argument is ignored.

Remarks

The size may be left out completely so that the macro can be invoked as BOOST_PP_TUPLE_EAT(); you may get a warning from some compilers, but the functionality will still work. If you specify a size, it will be ignored, but the warning from some compilers will not occur.

See Also

Requirements

Header:  <boost/preprocessor/tuple/eat.hpp>

Sample Code

#include <boost/preprocessor/control/if.hpp>
#include <boost/preprocessor/tuple/eat.hpp>

#define OP(a, b) (a b)
#define MACRO(n) BOOST_PP_IF(n, OP, BOOST_PP_TUPLE_EAT())(1, 2)

MACRO(0) // expands to nothing
MACRO(1) // expands to (1, 2)
© Copyright Housemarque Oy 2002
© Copyright Paul Mensonides 2002
© Copyright Edward Diener 2011,2013,2020

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at www.boost.org/LICENSE_1_0.txt)