The BOOST_PP_LESS_D macro compares two values for lesser magnitude.  It reenters BOOST_PP_WHILE with maximum efficiency.

Usage

BOOST_PP_LESS_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 y, this macro expands to 1.  Otherwise, it expands to 0.

See Also

Requirements

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

Sample Code

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

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

#define PRED(d, _, num) BOOST_PP_LESS_D(d, num, 3)

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