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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
  50.  
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