117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
// (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_STREAM_BUFFER_HPP_INCLUDED
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#define BOOST_IOSTREAMS_STREAM_BUFFER_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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#include <memory> // allocator.
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#include <boost/config.hpp> // BOOST_DEDUCED_TYPENAME.
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#include <boost/iostreams/detail/char_traits.hpp>
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#include <boost/iostreams/detail/config/overload_resolution.hpp>
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#include <boost/iostreams/detail/forward.hpp>
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#include <boost/iostreams/detail/ios.hpp> // failure, streamsize.
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#include <boost/iostreams/detail/streambuf/direct_streambuf.hpp>
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#include <boost/iostreams/detail/streambuf/indirect_streambuf.hpp>
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#include <boost/iostreams/traits.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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// Must come last.
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#include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC.
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namespace boost { namespace iostreams { namespace detail {
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template<typename T, typename Tr, typename Alloc, typename Mode>
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struct stream_buffer_traits {
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typedef typename
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mpl::if_<
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is_convertible<
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BOOST_DEDUCED_TYPENAME category_of<T>::type,
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direct_tag
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>,
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direct_streambuf<T, Tr>,
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indirect_streambuf<T, Tr, Alloc, Mode>
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>::type type;
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};
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} } } // End namespaces detail, iostreams, boost
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#ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION
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# include <boost/iostreams/detail/broken_overload_resolution/stream_buffer.hpp>
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#else
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namespace boost { namespace iostreams {
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template< typename T,
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typename Tr =
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BOOST_IOSTREAMS_CHAR_TRAITS(
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BOOST_DEDUCED_TYPENAME char_type_of<T>::type
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),
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typename Alloc =
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std::allocator<
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BOOST_DEDUCED_TYPENAME char_type_of<T>::type
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>,
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typename Mode = BOOST_DEDUCED_TYPENAME mode_of<T>::type >
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class stream_buffer
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: public detail::stream_buffer_traits<T, Tr, Alloc, Mode>::type
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{
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private:
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BOOST_STATIC_ASSERT((
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is_convertible<
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BOOST_DEDUCED_TYPENAME iostreams::category_of<T>::type, Mode
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>::value
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));
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typedef typename
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detail::stream_buffer_traits<
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T, Tr, Alloc, Mode
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>::type base_type;
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public:
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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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closable_tag,
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streambuf_tag
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{ };
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BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr)
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public:
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stream_buffer() { }
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~stream_buffer()
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{
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try {
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if (this->is_open() && this->auto_close())
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this->close();
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} catch (...) { }
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}
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BOOST_IOSTREAMS_FORWARD( stream_buffer, open_impl, T,
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BOOST_IOSTREAMS_PUSH_PARAMS,
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BOOST_IOSTREAMS_PUSH_ARGS )
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T& operator*() { return *this->component(); }
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T* operator->() { return this->component(); }
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private:
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void open_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS())
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{ // Used for forwarding.
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if (this->is_open())
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boost::throw_exception(
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BOOST_IOSTREAMS_FAILURE("already open")
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);
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base_type::open(t BOOST_IOSTREAMS_PUSH_ARGS());
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}
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};
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} } // End namespaces iostreams, boost.
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#endif // #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION
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#include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC.
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#endif // #ifndef BOOST_IOSTREAMS_STREAM_BUFFER_HPP_INCLUDED
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