mirror of
https://github.com/yuzu-emu/ext-boost.git
synced 2024-12-23 07:45:34 +00:00
68 lines
1.4 KiB
C++
68 lines
1.4 KiB
C++
|
|
||
|
|
#ifndef BOOST_MPL_IS_PLACEHOLDER_HPP_INCLUDED
|
||
|
|
#define BOOST_MPL_IS_PLACEHOLDER_HPP_INCLUDED
|
||
|
|
|
||
|
|
// Copyright Aleksey Gurtovoy 2001-2004
|
||
|
|
//
|
||
|
|
// Distributed under the Boost Software License, Version 1.0.
|
||
|
|
// (See accompanying file LICENSE_1_0.txt or copy at
|
||
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
||
|
|
//
|
||
|
|
// See http://www.boost.org/libs/mpl for documentation.
|
||
|
|
|
||
|
|
// $Id$
|
||
|
|
// $Date$
|
||
|
|
// $Revision$
|
||
|
|
|
||
|
|
#include <boost/mpl/arg_fwd.hpp>
|
||
|
|
#include <boost/mpl/bool.hpp>
|
||
|
|
#include <boost/mpl/aux_/yes_no.hpp>
|
||
|
|
#include <boost/mpl/aux_/type_wrapper.hpp>
|
||
|
|
#include <boost/mpl/aux_/nttp_decl.hpp>
|
||
|
|
#include <boost/mpl/aux_/config/ctps.hpp>
|
||
|
|
#include <boost/mpl/aux_/config/static_constant.hpp>
|
||
|
|
|
||
|
|
namespace boost { namespace mpl {
|
||
|
|
|
||
|
|
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
|
||
|
|
|
||
|
|
template< typename T >
|
||
|
|
struct is_placeholder
|
||
|
|
: bool_<false>
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
template< BOOST_MPL_AUX_NTTP_DECL(int, N) >
|
||
|
|
struct is_placeholder< arg<N> >
|
||
|
|
: bool_<true>
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
namespace aux {
|
||
|
|
|
||
|
|
aux::no_tag is_placeholder_helper(...);
|
||
|
|
|
||
|
|
template< BOOST_MPL_AUX_NTTP_DECL(int, N) >
|
||
|
|
aux::yes_tag is_placeholder_helper(aux::type_wrapper< arg<N> >*);
|
||
|
|
|
||
|
|
} // namespace aux
|
||
|
|
|
||
|
|
template< typename T >
|
||
|
|
struct is_placeholder
|
||
|
|
{
|
||
|
|
static aux::type_wrapper<T>* get();
|
||
|
|
BOOST_STATIC_CONSTANT(bool, value =
|
||
|
|
sizeof(aux::is_placeholder_helper(get())) == sizeof(aux::yes_tag)
|
||
|
|
);
|
||
|
|
|
||
|
|
typedef bool_<value> type;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
||
|
|
|
||
|
|
}}
|
||
|
|
|
||
|
|
#endif // BOOST_MPL_IS_PLACEHOLDER_HPP_INCLUDED
|