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#include <boost/static_assert.hpp>
25
26namespace boost
27{
28
29template< int I > struct arg
30{
31 BOOST_CONSTEXPR arg()
32 {
33 }
34
35 template< class T > BOOST_CONSTEXPR arg( T const & /* t */ )
36 {
37 BOOST_STATIC_ASSERT( I == is_placeholder<T>::value );
38 }
39};
40
41template< int I > BOOST_CONSTEXPR 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
63

source code of boost/boost/bind/arg.hpp