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