1 #ifndef BOOST_IS_PLACEHOLDER_HPP_INCLUDED
2 #define BOOST_IS_PLACEHOLDER_HPP_INCLUDED
3 
4 // MS compatible compilers support #pragma once
5 
6 #if defined( _MSC_VER ) && ( _MSC_VER >= 1020 )
7 # pragma once
8 #endif
9 
10 
11 //  is_placeholder.hpp - TR1 is_placeholder metafunction
12 //
13 //  Copyright (c) 2006 Peter Dimov
14 //
15 //  Distributed under the Boost Software License, Version 1.0.
16 //
17 //  See accompanying file LICENSE_1_0.txt or copy at
18 //  http://www.boost.org/LICENSE_1_0.txt
19 
20 
21 namespace boost
22 {
23 
24 template< class T > struct is_placeholder
25 {
26     enum _vt { value = 0 };
27 };
28 
29 } // namespace boost
30 
31 #endif // #ifndef BOOST_IS_PLACEHOLDER_HPP_INCLUDED
32