Chris@16: // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
Chris@16: // (C) Copyright 2003-2007 Jonathan Turkanis
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
Chris@16: 
Chris@16: // See http://www.boost.org/libs/iostreams for documentation.
Chris@16: 
Chris@16: #ifndef BOOST_IOSTREAMS_DETAIL_MODE_ADAPTER_HPP_INCLUDED
Chris@16: #define BOOST_IOSTREAMS_DETAIL_MODE_ADAPTER_HPP_INCLUDED
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
Chris@16: # pragma once
Chris@16: #endif              
Chris@16: 
Chris@16: // Contains the definition of the class template mode_adapter, which allows
Chris@16: // a filter or device to function as if it has a different i/o mode than that
Chris@16: // deduced by the metafunction mode_of.
Chris@16: 
Chris@16: #include <boost/config.hpp>                // BOOST_MSVC.
Chris@16: #include <boost/detail/workaround.hpp>
Chris@16: #include <boost/iostreams/categories.hpp>
Chris@16: #include <boost/iostreams/detail/ios.hpp>  // openmode, seekdir, int types. 
Chris@16: #include <boost/iostreams/traits.hpp>
Chris@16: #include <boost/iostreams/operations.hpp> 
Chris@16: #include <boost/mpl/if.hpp> 
Chris@16: 
Chris@16: namespace boost { namespace iostreams { namespace detail {
Chris@16: 
Chris@16: template<typename Mode, typename T>
Chris@16: class mode_adapter {
Chris@16: private:
Chris@16:     struct empty_base { };
Chris@16: public:
Chris@16:     typedef typename wrapped_type<T>::type  component_type;
Chris@16:     typedef typename char_type_of<T>::type  char_type;
Chris@16:     struct category 
Chris@16:         : Mode, 
Chris@16:           device_tag,
Chris@16:           mpl::if_<is_filter<T>, filter_tag, device_tag>,
Chris@16:           mpl::if_<is_filter<T>, multichar_tag, empty_base>,
Chris@16:           #if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
Chris@16:               closable_tag, // VC6 can't see member close()!
Chris@16:           #endif
Chris@16:           localizable_tag
Chris@16:         { };
Chris@16:     explicit mode_adapter(const component_type& t) : t_(t) { }
Chris@16: 
Chris@16:         // Device member functions.
Chris@16: 
Chris@16:     std::streamsize read(char_type* s, std::streamsize n);
Chris@16:     std::streamsize write(const char_type* s, std::streamsize n);
Chris@16:     std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
Chris@16:                          BOOST_IOS::openmode which = 
Chris@16:                              BOOST_IOS::in | BOOST_IOS::out );
Chris@16: #if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
Chris@16:     void close();
Chris@16:     void close(BOOST_IOS::openmode which);
Chris@16: #endif
Chris@16: 
Chris@16:         // Filter member functions.
Chris@16: 
Chris@16:     template<typename Source>
Chris@16:     std::streamsize read(Source& src, char_type* s, std::streamsize n)
Chris@16:     { return iostreams::read(t_, src, s, n); }
Chris@16: 
Chris@16:     template<typename Sink>
Chris@16:     std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
Chris@16:     { return iostreams::write(t_, snk, s, n); }
Chris@16: 
Chris@16:     template<typename Device>
Chris@16:     std::streampos seek(Device& dev, stream_offset off, BOOST_IOS::seekdir way)
Chris@16:     { return iostreams::seek(t_, dev, off, way); }
Chris@16: 
Chris@16:     template<typename Device>
Chris@16:     std::streampos seek( Device& dev, stream_offset off, 
Chris@16:                          BOOST_IOS::seekdir way, BOOST_IOS::openmode which  )
Chris@16:     { return iostreams::seek(t_, dev, off, way, which); }
Chris@16: 
Chris@16:     template<typename Device>
Chris@16:     void close(Device& dev)
Chris@16:     { detail::close_all(t_, dev); }
Chris@16: 
Chris@16:     template<typename Device>
Chris@16:     void close(Device& dev, BOOST_IOS::openmode which)
Chris@16:     { iostreams::close(t_, dev, which); }
Chris@16: 
Chris@16:     template<typename Locale>
Chris@16:     void imbue(const Locale& loc)
Chris@16:     { iostreams::imbue(t_, loc); }
Chris@16: private:
Chris@16:     component_type t_;
Chris@16: };
Chris@16:                     
Chris@16: //------------------Implementation of mode_adapter----------------------------//
Chris@16: 
Chris@16: template<typename Mode, typename T>
Chris@16: std::streamsize mode_adapter<Mode, T>::read
Chris@16:     (char_type* s, std::streamsize n)
Chris@16: { return boost::iostreams::read(t_, s, n); }
Chris@16: 
Chris@16: template<typename Mode, typename T>
Chris@16: std::streamsize mode_adapter<Mode, T>::write
Chris@16:     (const char_type* s, std::streamsize n)
Chris@16: { return boost::iostreams::write(t_, s, n); }
Chris@16: 
Chris@16: template<typename Mode, typename T>
Chris@16: std::streampos mode_adapter<Mode, T>::seek
Chris@16:     (stream_offset off, BOOST_IOS::seekdir way, BOOST_IOS::openmode which)
Chris@16: { return boost::iostreams::seek(t_, off, way, which); }
Chris@16: 
Chris@16: #if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
Chris@16:     template<typename Mode, typename T>
Chris@16:     void mode_adapter<Mode, T>::close() 
Chris@16:     { detail::close_all(t_); }
Chris@16: 
Chris@16:     template<typename Mode, typename T>
Chris@16:     void mode_adapter<Mode, T>::close(BOOST_IOS::openmode which) 
Chris@16:     { iostreams::close(t_, which); }
Chris@16: #endif
Chris@16: 
Chris@16: } } } // End namespaces detail, iostreams, boost.
Chris@16: 
Chris@16: #endif // #ifndef BOOST_IOSTREAMS_DETAIL_MODE_ADAPTER_HPP_INCLUDED //-----//