The BOOST_PP_LESS_EQUAL_D macro compares two values for equality or lesser magnitude.  It reenters BOOST_PP_WHILE with maximum efficiency.

Usage

BOOST_PP_LESS_EQUAL_D(d, x, y)

Arguments

d
The next available BOOST_PP_WHILE iteration. 
x
The left operand of the comparison.  Valid values range from 0 to BOOST_PP_LIMIT_MAG.
y
The right operand of the comparison.  Valid values range from 0 to BOOST_PP_LIMIT_MAG.

Remarks

If x is less than or equal to y, this macro expands to 1.  Otherwise, it expands to 0.

See Also

Requirements

Header:  <boost/preprocessor/comparison/less_equal.hpp>

Sample Code

#include <boost/preprocessor/comparison/less_equal.hpp>
#include <boost/preprocessor/list/filter.hpp>

#define LIST (1, (2, (3, (4, (5, BOOST_PP_NIL)))))

#define PRED(d, _, num) BOOST_PP_LESS_EQUAL_D(d, num, 4)

BOOST_PP_LIST_FILTER(PRED, nil, LIST)
   // expands to (1, (2, (3, (4, BOOST_PP_NIL))))

Copyright Housemarque Oy 2002
Copyright Paul Mensonides 2002

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)