boost_preprocessor/include/boost/preprocessor/arithmetic/mod.hpp

#ifndef BOOST_PREPROCESSOR_ARITHMETIC_MOD_HPP
#define BOOST_PREPROCESSOR_ARITHMETIC_MOD_HPP

// Copyright (C) 2001
// Housemarque Oy
// http://www.housemarque.com
//
// Permission to copy, use, modify, sell and distribute this software is
// granted provided this copyright notice appears in all copies. This
// software is provided "as is" without express or implied warranty, and
// with no claim as to its suitability for any purpose.

// See http://www.boost.org for most recent version.

/*! \file

<a href="../../../../boost/preprocessor/arithmetic/mod.hpp">Click here to see the header.</a>
*/

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

//! Expands to the remainder of X and Y.
/*!
For example, BOOST_PP_MOD(4,3) expands to 1 (a single token).
*/
#define BOOST_PP_MOD(X,Y) BOOST_PP_MOD_D(0,X,Y)

#ifndef DOXYGEN_SHOULD_SKIP_THIS
#define BOOST_PP_MOD_D(D,X,Y) BOOST_PP_TUPLE_ELEM(2,0,BOOST_PP_WHILE##D(BOOST_PP_MOD_C,BOOST_PP_MOD_F,(X,Y)))
#define BOOST_PP_MOD_C(D,P) BOOST_PP_LESS_EQUAL_D(D,BOOST_PP_TUPLE_ELEM(2,1,P),BOOST_PP_TUPLE_ELEM(2,0,P))
#define BOOST_PP_MOD_F(D,P) (BOOST_PP_SUB_D(D,BOOST_PP_TUPLE_ELEM(2,0,P),BOOST_PP_TUPLE_ELEM(2,1,P)),BOOST_PP_TUPLE_ELEM(2,1,P))
#endif

//! Obsolete. Use BOOST_PP_MOD().
#define BOOST_PREPROCESSOR_MOD(X,Y) BOOST_PP_MOD(X,Y)
#endif