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/Src/Dependencies/Boost/boost/iostreams/detail/bool_trait_def.hpp

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 1// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
 2// (C) Copyright 2003-2007 Jonathan Turkanis
 3// Distributed under the Boost Software License, Version 1.0. (See accompanying
 4// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
 5
 6// See http://www.boost.org/libs/iostreams for documentation.
 7
 8#ifndef BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED
 9#define BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED     
10
11#include <boost/config.hpp> // BOOST_STATIC_CONSTANT.
12#include <boost/iostreams/detail/template_params.hpp>
13#include <boost/mpl/aux_/lambda_support.hpp>
14#include <boost/mpl/bool.hpp>
15#include <boost/preprocessor/cat.hpp>
16#include <boost/preprocessor/repetition/enum_params.hpp>
17#include <boost/type_traits/detail/yes_no_type.hpp>
18 
19// 
20// Macro name: BOOST_IOSTREAMS_BOOL_TRAIT_DEF
21// Description: Used to generate the traits classes is_istream, is_ostream,
22//      etc.
23//
24#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
25# define BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait)
26#else
27# define BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait) BOOST_PP_CAT(trait, _impl_):: 
28#endif
29#define BOOST_IOSTREAMS_BOOL_TRAIT_DEF(trait, type, arity) \
30    namespace BOOST_PP_CAT(trait, _impl_) { \
31      BOOST_IOSTREAMS_TEMPLATE_PARAMS(arity, T) \
32      type_traits::yes_type helper \
33          (const volatile type BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)*); \
34      type_traits::no_type helper(...); \
35      template<typename T> \
36      struct impl { \
37           BOOST_STATIC_CONSTANT(bool, value = \
38           (sizeof(BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait) \
39              helper(static_cast<T*>(0))) == \
40                sizeof(type_traits::yes_type))); \
41      }; \
42    } \
43    template<typename T> \
44    struct trait \
45        : mpl::bool_<BOOST_PP_CAT(trait, _impl_)::impl<T>::value> \
46    { BOOST_MPL_AUX_LAMBDA_SUPPORT(1, trait, (T)) }; \
47    /**/
48
49#endif // #ifndef BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED