1 2 #ifndef BOOST_MPL_MATH_IS_EVEN_HPP_INCLUDED 3 #define BOOST_MPL_MATH_IS_EVEN_HPP_INCLUDED 4 5 // Copyright Aleksey Gurtovoy 2000-2004 6 // 7 // Distributed under the Boost Software License, Version 1.0. 8 // (See accompanying file LICENSE_1_0.txt or copy at 9 // http://www.boost.org/LICENSE_1_0.txt) 10 // 11 // See http://www.boost.org/libs/mpl for documentation. 12 13 // $Id$ 14 // $Date$ 15 // $Revision$ 16 17 #include <boost/mpl/bool.hpp> 18 #include <boost/mpl/aux_/na_spec.hpp> 19 #include <boost/mpl/aux_/lambda_support.hpp> 20 #include <boost/mpl/aux_/config/msvc.hpp> 21 #include <boost/mpl/aux_/config/workaround.hpp> 22 23 namespace boost { namespace mpl { 24 25 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) 26 namespace aux 27 { 28 template <class N> 29 struct is_even_base 30 { 31 enum { value = (N::value % 2) == 0 }; 32 typedef bool_<value> type; 33 }; 34 } 35 #endif 36 37 template< 38 typename BOOST_MPL_AUX_NA_PARAM(N) 39 > 40 struct is_even 41 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) 42 : aux::is_even_base<N>::type 43 #else 44 : bool_<((N::value % 2) == 0)> 45 #endif 46 { 47 BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_even,(N)) 48 }; 49 50 BOOST_MPL_AUX_NA_SPEC(1, is_even) 51 52 }} 53 54 #endif // BOOST_MPL_MATH_IS_EVEN_HPP_INCLUDED 55