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118 lines
4.0 KiB
118 lines
4.0 KiB
// (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_MODE_ADAPTER_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_MODE_ADAPTER_HPP_INCLUDED
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#if defined(_MSC_VER)
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# pragma once
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#endif
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// Contains the definition of the class template mode_adapter, which allows
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// a filter or device to function as if it has a different i/o mode than that
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// deduced by the metafunction mode_of.
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#include <boost/config.hpp> // BOOST_MSVC.
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#include <boost/detail/workaround.hpp>
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#include <boost/iostreams/categories.hpp>
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#include <boost/iostreams/detail/ios.hpp> // openmode, seekdir, int types.
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#include <boost/iostreams/traits.hpp>
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#include <boost/iostreams/operations.hpp>
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#include <boost/mpl/if.hpp>
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namespace boost { namespace iostreams { namespace detail {
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template<typename Mode, typename T>
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class mode_adapter {
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private:
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struct empty_base { };
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public:
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typedef typename wrapped_type<T>::type component_type;
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typedef typename char_type_of<T>::type char_type;
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struct category
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: Mode,
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device_tag,
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mpl::if_<is_filter<T>, filter_tag, device_tag>,
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mpl::if_<is_filter<T>, multichar_tag, empty_base>,
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closable_tag,
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localizable_tag
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{ };
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explicit mode_adapter(const component_type& t) : t_(t) { }
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// Device member functions.
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std::streamsize read(char_type* s, std::streamsize n);
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std::streamsize write(const char_type* s, std::streamsize n);
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std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
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BOOST_IOS::openmode which =
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BOOST_IOS::in | BOOST_IOS::out );
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void close();
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void close(BOOST_IOS::openmode which);
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// Filter member functions.
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template<typename Source>
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std::streamsize read(Source& src, char_type* s, std::streamsize n)
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{ return iostreams::read(t_, src, s, n); }
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template<typename Sink>
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std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
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{ return iostreams::write(t_, snk, s, n); }
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template<typename Device>
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std::streampos seek(Device& dev, stream_offset off, BOOST_IOS::seekdir way)
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{ return iostreams::seek(t_, dev, off, way); }
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template<typename Device>
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std::streampos seek( Device& dev, stream_offset off,
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BOOST_IOS::seekdir way, BOOST_IOS::openmode which )
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{ return iostreams::seek(t_, dev, off, way, which); }
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template<typename Device>
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void close(Device& dev)
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{ detail::close_all(t_, dev); }
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template<typename Device>
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void close(Device& dev, BOOST_IOS::openmode which)
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{ iostreams::close(t_, dev, which); }
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template<typename Locale>
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void imbue(const Locale& loc)
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{ iostreams::imbue(t_, loc); }
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private:
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component_type t_;
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};
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//------------------Implementation of mode_adapter----------------------------//
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template<typename Mode, typename T>
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std::streamsize mode_adapter<Mode, T>::read
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(char_type* s, std::streamsize n)
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{ return boost::iostreams::read(t_, s, n); }
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template<typename Mode, typename T>
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std::streamsize mode_adapter<Mode, T>::write
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(const char_type* s, std::streamsize n)
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{ return boost::iostreams::write(t_, s, n); }
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template<typename Mode, typename T>
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std::streampos mode_adapter<Mode, T>::seek
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(stream_offset off, BOOST_IOS::seekdir way, BOOST_IOS::openmode which)
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{ return boost::iostreams::seek(t_, off, way, which); }
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template<typename Mode, typename T>
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void mode_adapter<Mode, T>::close()
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{ detail::close_all(t_); }
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template<typename Mode, typename T>
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void mode_adapter<Mode, T>::close(BOOST_IOS::openmode which)
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{ iostreams::close(t_, which); }
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} } } // End namespaces detail, iostreams, boost.
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_MODE_ADAPTER_HPP_INCLUDED //-----//
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