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- // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
- // (C) Copyright 2003-2007 Jonathan Turkanis
- // 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/iostreams for documentation.
- #ifndef BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED
- #define BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED
- #include <boost/config.hpp> // BOOST_STATIC_CONSTANT.
- #include <boost/iostreams/detail/template_params.hpp>
- #include <boost/mpl/aux_/lambda_support.hpp>
- #include <boost/mpl/bool.hpp>
- #include <boost/preprocessor/cat.hpp>
- #include <boost/preprocessor/repetition/enum_params.hpp>
- #include <boost/type_traits/detail/yes_no_type.hpp>
-
- //
- // Macro name: BOOST_IOSTREAMS_BOOL_TRAIT_DEF
- // Description: Used to generate the traits classes is_istream, is_ostream,
- // etc.
- //
- #if BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x582))
- # define BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait)
- #else
- # define BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait) BOOST_PP_CAT(trait, _impl_)::
- #endif
- #define BOOST_IOSTREAMS_BOOL_TRAIT_DEF(trait, type, arity) \
- namespace BOOST_PP_CAT(trait, _impl_) { \
- BOOST_IOSTREAMS_TEMPLATE_PARAMS(arity, T) \
- type_traits::yes_type helper \
- (const volatile type BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)*); \
- type_traits::no_type helper(...); \
- template<typename T> \
- struct impl { \
- BOOST_STATIC_CONSTANT(bool, value = \
- (sizeof(BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait) \
- helper(static_cast<T*>(0))) == \
- sizeof(type_traits::yes_type))); \
- }; \
- } \
- template<typename T> \
- struct trait \
- : mpl::bool_<BOOST_PP_CAT(trait, _impl_)::impl<T>::value> \
- { BOOST_MPL_AUX_LAMBDA_SUPPORT(1, trait, (T)) }; \
- /**/
- #endif // #ifndef BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED
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