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50 lines
1.9 KiB
50 lines
1.9 KiB
3 years ago
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2003-2007 Jonathan Turkanis
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// See http://www.boost.org/libs/iostreams for documentation.
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#ifndef BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED
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#include <boost/config.hpp> // BOOST_STATIC_CONSTANT.
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#include <boost/iostreams/detail/template_params.hpp>
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#include <boost/mpl/aux_/lambda_support.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/type_traits/detail/yes_no_type.hpp>
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//
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// Macro name: BOOST_IOSTREAMS_BOOL_TRAIT_DEF
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// Description: Used to generate the traits classes is_istream, is_ostream,
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// etc.
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//
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#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
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# define BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait)
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#else
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# define BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait) BOOST_PP_CAT(trait, _impl_)::
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#endif
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#define BOOST_IOSTREAMS_BOOL_TRAIT_DEF(trait, type, arity) \
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namespace BOOST_PP_CAT(trait, _impl_) { \
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BOOST_IOSTREAMS_TEMPLATE_PARAMS(arity, T) \
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type_traits::yes_type helper \
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(const volatile type BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)*); \
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type_traits::no_type helper(...); \
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template<typename T> \
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struct impl { \
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BOOST_STATIC_CONSTANT(bool, value = \
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(sizeof(BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait) \
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helper(static_cast<T*>(0))) == \
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sizeof(type_traits::yes_type))); \
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}; \
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} \
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template<typename T> \
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struct trait \
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: mpl::bool_<BOOST_PP_CAT(trait, _impl_)::impl<T>::value> \
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{ BOOST_MPL_AUX_LAMBDA_SUPPORT(1, trait, (T)) }; \
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/**/
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED
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