/extlibs/Boost/include/boost/bind/arg.hpp

 1#ifndef BOOST_BIND_ARG_HPP_INCLUDED
 2#define BOOST_BIND_ARG_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//  bind/arg.hpp
12//
13//  Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
14//
15// Distributed under the Boost Software License, Version 1.0. (See
16// accompanying file LICENSE_1_0.txt or copy at
17// http://www.boost.org/LICENSE_1_0.txt)
18//
19//  See http://www.boost.org/libs/bind/bind.html for documentation.
20//
21
22#include <boost/config.hpp>
23#include <boost/is_placeholder.hpp>
24
25namespace boost
26{
27
28template< int I > struct arg
29{
30    arg()
31    {
32    }
33
34    template< class T > arg( T const & /* t */ )
35    {
36        // static assert I == is_placeholder<T>::value
37        typedef char T_must_be_placeholder[ I == is_placeholder<T>::value? 1: -1 ];
38    }
39};
40
41template< int I > bool operator==( arg<I> const &, arg<I> const & )
42{
43    return true;
44}
45
46#if !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
47
48template< int I > struct is_placeholder< arg<I> >
49{
50    enum _vt { value = I };
51};
52
53template< int I > struct is_placeholder< arg<I> (*) () >
54{
55    enum _vt { value = I };
56};
57
58#endif
59
60} // namespace boost
61
62#endif // #ifndef BOOST_BIND_ARG_HPP_INCLUDED