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123 lines
4.3 KiB
123 lines
4.3 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) && (_MSC_VER >= 1020) |
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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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#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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closable_tag, // VC6 can't see member close()! |
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#endif |
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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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#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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void close(); |
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void close(BOOST_IOS::openmode which); |
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#endif |
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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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#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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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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#endif |
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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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