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 

    25 namespace boost

    26 {

    27 

    28 template< 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 

    41 template< 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 

    48 template< int I > struct is_placeholder< arg<I> >

    49 {

    50     enum _vt { value = I };

    51 };

    52 

    53 template< 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