sl@0: // (C) Copyright Jonathan Turkanis 2003.
sl@0: // Distributed under the Boost Software License, Version 1.0. (See accompanying
sl@0: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
sl@0: 
sl@0: // See http://www.boost.org/libs/iostreams for documentation.
sl@0: 
sl@0: #ifndef BOOST_IOSTREAMS_PIPABLE_HPP_INCLUDED
sl@0: #define BOOST_IOSTREAMS_PIPABLE_HPP_INCLUDED
sl@0: 
sl@0: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
sl@0: # pragma once
sl@0: #endif
sl@0: 
sl@0: #include <boost/config.hpp> // BOOST_MSVC.
sl@0: #include <boost/detail/workaround.hpp>           
sl@0: #include <boost/iostreams/detail/template_params.hpp>
sl@0: #include <boost/iostreams/traits.hpp>
sl@0: #include <boost/mpl/bool.hpp>
sl@0: #include <boost/preprocessor/punctuation/comma_if.hpp>
sl@0: #include <boost/preprocessor/repetition/enum_params.hpp>
sl@0: #include <boost/static_assert.hpp>
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0: # include <boost/type_traits/is_base_and_derived.hpp>
sl@0: #endif
sl@0: 
sl@0: #define BOOST_IOSTREAMS_PIPABLE(filter, arity) \
sl@0:     template< BOOST_PP_ENUM_PARAMS(arity, typename T) \
sl@0:               BOOST_PP_COMMA_IF(arity) typename Component> \
sl@0:     ::boost::iostreams::pipeline< \
sl@0:         ::boost::iostreams::detail::pipeline_segment< \
sl@0:             filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T) \
sl@0:         >, \
sl@0:         Component \
sl@0:     > operator|( const filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)& f, \
sl@0:                  const Component& c ) \
sl@0:     { \
sl@0:         typedef ::boost::iostreams::detail::pipeline_segment< \
sl@0:                     filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T) \
sl@0:                 > segment; \
sl@0:         return ::boost::iostreams::pipeline<segment, Component> \
sl@0:                    (segment(f), c); \
sl@0:     } \
sl@0:     /**/
sl@0: 
sl@0: namespace boost { namespace iostreams {
sl@0: 
sl@0: template<typename Pipeline, typename Component>
sl@0: struct pipeline;
sl@0:     
sl@0: namespace detail {
sl@0: 
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) 
sl@0:     struct pipeline_base { };
sl@0: 
sl@0:     template<typename T>
sl@0:     struct is_pipeline 
sl@0:         : is_base_and_derived<pipeline_base, T>
sl@0:         { };
sl@0: #endif 
sl@0: #if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
sl@0:     template<typename T>
sl@0:     struct is_pipeline : mpl::false_ { };
sl@0: 
sl@0:     template<typename Pipeline, typename Component>
sl@0:     struct is_pipeline< pipeline<Pipeline, Component> > : mpl::true_ { };
sl@0: #endif
sl@0: 
sl@0: template<typename Component>
sl@0: class pipeline_segment 
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
sl@0:     : pipeline_base 
sl@0: #endif 
sl@0: {
sl@0: public:
sl@0:     pipeline_segment(const Component& component) 
sl@0:         : component_(component) 
sl@0:         { }
sl@0:     template<typename Fn>
sl@0:     void for_each(Fn fn) const { fn(component_); }
sl@0:     template<typename Chain>
sl@0:     void push(Chain& chn) const { chn.push(component_); }
sl@0: private:
sl@0:     const Component& component_;
sl@0: };
sl@0: 
sl@0: } // End namespace detail.
sl@0:                     
sl@0: //------------------Definition of Pipeline------------------------------------//
sl@0: 
sl@0: template<typename Pipeline, typename Component>
sl@0: struct pipeline : Pipeline {
sl@0:     typedef Pipeline   pipeline_type;
sl@0:     typedef Component  component_type;
sl@0:     pipeline(const Pipeline& p, const Component& component)
sl@0:         : Pipeline(p), component_(component)
sl@0:         { }
sl@0:     template<typename Fn>
sl@0:     void for_each(Fn fn) const
sl@0:     {
sl@0:         Pipeline::for_each(fn);
sl@0:         fn(component_);
sl@0:     }
sl@0:     template<typename Chain>
sl@0:     void push(Chain& chn) const
sl@0:     { 
sl@0:         Pipeline::push(chn);
sl@0:         chn.push(component_);
sl@0:     }
sl@0:     const Pipeline& tail() const { return *this; }
sl@0:     const Component& head() const { return component_; }
sl@0: private:
sl@0:     const Component& component_;
sl@0: };
sl@0: 
sl@0: template<typename Pipeline, typename Filter, typename Component>
sl@0: pipeline<pipeline<Pipeline, Filter>, Component>
sl@0: operator|(const pipeline<Pipeline, Filter>& p, const Component& cmp)
sl@0: {
sl@0:     BOOST_STATIC_ASSERT(is_filter<Filter>::value);
sl@0:     return pipeline<pipeline<Pipeline, Filter>, Component>(p, cmp);
sl@0: }
sl@0: 
sl@0: } } // End namespaces iostreams, boost.
sl@0: 
sl@0: #endif // #ifndef BOOST_IOSTREAMS_PIPABLE_HPP_INCLUDED