1 
2 #ifndef BOOST_MPL_SAME_AS_HPP_INCLUDED
3 #define BOOST_MPL_SAME_AS_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/not.hpp>
18 #include <boost/mpl/aux_/lambda_spec.hpp>
19 #include <boost/mpl/aux_/config/forwarding.hpp>
20 
21 #include <boost/type_traits/is_same.hpp>
22 
23 namespace boost { namespace mpl {
24 
25 template< typename T1 >
26 struct same_as
27 {
28     template< typename T2 > struct apply
29 #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
30         : is_same<T1,T2>
31     {
32 #else
33     {
34         typedef typename is_same<T1,T2>::type type;
35 #endif
36     };
37 };
38 
39 template< typename T1 >
40 struct not_same_as
41 {
42     template< typename T2 > struct apply
43 #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
44         : not_< is_same<T1,T2> >
45     {
46 #else
47     {
48         typedef typename not_< is_same<T1,T2> >::type type;
49 #endif
50     };
51 };
52 
53 }}
54 
55 #endif // BOOST_MPL_SAME_AS_HPP_INCLUDED
56