| Jeff Thompson | 86b6d64 | 2013-10-17 15:01:56 -0700 | [diff] [blame] | 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 NDNBOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED |
| 9 | #define NDNBOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED |
| 10 | |
| 11 | #include <ndnboost/config.hpp> // NDNBOOST_STATIC_CONSTANT. |
| 12 | #include <ndnboost/iostreams/detail/template_params.hpp> |
| 13 | #include <ndnboost/mpl/aux_/lambda_support.hpp> |
| 14 | #include <ndnboost/mpl/bool.hpp> |
| 15 | #include <ndnboost/preprocessor/cat.hpp> |
| 16 | #include <ndnboost/preprocessor/repetition/enum_params.hpp> |
| 17 | #include <ndnboost/type_traits/detail/yes_no_type.hpp> |
| 18 | |
| 19 | // |
| 20 | // Macro name: NDNBOOST_IOSTREAMS_BOOL_TRAIT_DEF |
| 21 | // Description: Used to generate the traits classes is_istream, is_ostream, |
| 22 | // etc. |
| 23 | // |
| 24 | #if NDNBOOST_WORKAROUND(__BORLANDC__, NDNBOOST_TESTED_AT(0x582)) |
| 25 | # define NDNBOOST_IOSTREAMS_TRAIT_NAMESPACE(trait) |
| 26 | #else |
| 27 | # define NDNBOOST_IOSTREAMS_TRAIT_NAMESPACE(trait) NDNBOOST_PP_CAT(trait, _impl_):: |
| 28 | #endif |
| 29 | #define NDNBOOST_IOSTREAMS_BOOL_TRAIT_DEF(trait, type, arity) \ |
| 30 | namespace NDNBOOST_PP_CAT(trait, _impl_) { \ |
| 31 | NDNBOOST_IOSTREAMS_TEMPLATE_PARAMS(arity, T) \ |
| 32 | type_traits::yes_type helper \ |
| 33 | (const volatile type NDNBOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)*); \ |
| 34 | type_traits::no_type helper(...); \ |
| 35 | template<typename T> \ |
| 36 | struct impl { \ |
| 37 | NDNBOOST_STATIC_CONSTANT(bool, value = \ |
| 38 | (sizeof(NDNBOOST_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_<NDNBOOST_PP_CAT(trait, _impl_)::impl<T>::value> \ |
| 46 | { NDNBOOST_MPL_AUX_LAMBDA_SUPPORT(1, trait, (T)) }; \ |
| 47 | /**/ |
| 48 | |
| 49 | #endif // #ifndef NDNBOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED |