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/Src/Dependencies/Boost/boost/mpl/is_placeholder.hpp

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 1
 2#ifndef BOOST_MPL_IS_PLACEHOLDER_HPP_INCLUDED
 3#define BOOST_MPL_IS_PLACEHOLDER_HPP_INCLUDED
 4
 5// Copyright Aleksey Gurtovoy 2001-2004
 6//
 7// Distributed under the Boost Software License, Version 1.0. 
 8// (See accompanying file LICENSE_1_0.txt or copy at 
 9// http://www.boost.org/LICENSE_1_0.txt)
10//
11// See http://www.boost.org/libs/mpl for documentation.
12
13// $Id: is_placeholder.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
14// $Date: 2008-10-11 17:19:02 +1100 (Sat, 11 Oct 2008) $
15// $Revision: 49267 $
16
17#include <boost/mpl/arg_fwd.hpp>
18#include <boost/mpl/bool.hpp>
19#include <boost/mpl/aux_/yes_no.hpp>
20#include <boost/mpl/aux_/type_wrapper.hpp>
21#include <boost/mpl/aux_/nttp_decl.hpp>
22#include <boost/mpl/aux_/config/ctps.hpp>
23#include <boost/mpl/aux_/config/static_constant.hpp>
24
25namespace boost { namespace mpl {
26
27#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
28
29template< typename T >
30struct is_placeholder
31    : bool_<false>
32{
33};
34
35template< BOOST_MPL_AUX_NTTP_DECL(int, N) >
36struct is_placeholder< arg<N> >
37    : bool_<true>
38{
39};
40
41#else
42
43namespace aux {
44
45aux::no_tag is_placeholder_helper(...);
46
47template< BOOST_MPL_AUX_NTTP_DECL(int, N) >
48aux::yes_tag is_placeholder_helper(aux::type_wrapper< arg<N> >*);
49
50} // namespace aux
51
52template< typename T >
53struct is_placeholder
54{
55    static aux::type_wrapper<T>* get();
56    BOOST_STATIC_CONSTANT(bool, value = 
57          sizeof(aux::is_placeholder_helper(get())) == sizeof(aux::yes_tag)
58        );
59    
60    typedef bool_<value> type;
61};
62
63#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
64
65}}
66
67#endif // BOOST_MPL_IS_PLACEHOLDER_HPP_INCLUDED