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288 lines
10 KiB
288 lines
10 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_CONCEPT_ADAPTER_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_CONCEPT_ADAPTER_HPP_INCLUDED
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#include <boost/config.hpp> // SFINAE.
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#include <boost/iostreams/concepts.hpp>
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#include <boost/iostreams/categories.hpp>
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#include <boost/iostreams/detail/adapter/non_blocking_adapter.hpp>
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#include <boost/iostreams/detail/call_traits.hpp>
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#include <boost/iostreams/detail/char_traits.hpp>
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#include <boost/iostreams/detail/dispatch.hpp>
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#include <boost/iostreams/detail/error.hpp>
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#include <boost/iostreams/detail/streambuf.hpp> // pubsync.
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#include <boost/iostreams/detail/config/unreachable_return.hpp>
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#include <boost/iostreams/device/null.hpp>
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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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#include <boost/static_assert.hpp>
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#include <boost/throw_exception.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 Category> struct device_wrapper_impl;
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template<typename Category> struct flt_wrapper_impl;
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template<typename T>
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class concept_adapter {
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private:
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typedef typename detail::value_type<T>::type value_type;
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typedef typename dispatch<T, input, output>::type input_tag;
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typedef typename dispatch<T, output, input>::type output_tag;
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typedef typename
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mpl::if_<
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is_device<T>,
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device_wrapper_impl<input_tag>,
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flt_wrapper_impl<input_tag>
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>::type input_impl;
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typedef typename
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mpl::if_<
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is_device<T>,
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device_wrapper_impl<output_tag>,
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flt_wrapper_impl<output_tag>
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>::type output_impl;
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typedef typename
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mpl::if_<
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is_device<T>,
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device_wrapper_impl<any_tag>,
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flt_wrapper_impl<any_tag>
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>::type any_impl;
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public:
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typedef typename char_type_of<T>::type char_type;
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typedef typename category_of<T>::type category;
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explicit concept_adapter(const reference_wrapper<T>& ref) : t_(ref.get())
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{ BOOST_STATIC_ASSERT(is_std_io<T>::value); }
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explicit concept_adapter(const T& t) : t_(t)
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{ BOOST_STATIC_ASSERT(!is_std_io<T>::value); }
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T& operator*() { return t_; }
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T* operator->() { return &t_; }
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std::streamsize read(char_type* s, std::streamsize n)
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{ return this->read(s, n, (basic_null_source<char_type>*) 0); }
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template<typename Source>
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std::streamsize read(char_type* s, std::streamsize n, Source* src)
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{ return input_impl::read(t_, src, s, n); }
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std::streamsize write(const char_type* s, std::streamsize n)
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{ return this->write(s, n, (basic_null_sink<char_type>*) 0); }
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template<typename Sink>
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std::streamsize write(const char_type* s, std::streamsize n, Sink* snk)
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{ return output_impl::write(t_, snk, s, 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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{
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return this->seek( off, way, which,
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(basic_null_device<char_type, seekable>*) 0);
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}
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template<typename Device>
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std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
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BOOST_IOS::openmode which, Device* dev )
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{ return any_impl::seek(t_, dev, off, way, which); }
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void close(BOOST_IOS::openmode which)
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{ this->close(which, (basic_null_device<char_type, seekable>*) 0); }
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template<typename Device>
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void close(BOOST_IOS::openmode which, Device* dev)
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{ any_impl::close(t_, dev, which); }
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template<typename Device>
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bool flush( Device* dev )
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{
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bool result = any_impl::flush(t_, dev);
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if (dev && dev->BOOST_IOSTREAMS_PUBSYNC() == -1)
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result = false;
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return result;
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}
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template<typename Locale> // Avoid dependency on <locale>
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void imbue(const Locale& loc) { iostreams::imbue(t_, loc); }
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std::streamsize optimal_buffer_size() const
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{ return iostreams::optimal_buffer_size(t_); }
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private:
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BOOST_DELETED_FUNCTION(concept_adapter& operator=(const concept_adapter&));
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value_type t_;
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};
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//------------------Specializations of device_wrapper_impl--------------------//
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template<>
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struct device_wrapper_impl<any_tag> {
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template<typename Device, typename Dummy>
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static std::streampos
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seek( Device& dev, Dummy*, stream_offset off,
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BOOST_IOS::seekdir way, BOOST_IOS::openmode which )
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{
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typedef typename category_of<Device>::type category;
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return seek(dev, off, way, which, category());
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}
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template<typename Device>
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static std::streampos
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seek( Device&, stream_offset, BOOST_IOS::seekdir,
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BOOST_IOS::openmode, any_tag )
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{
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boost::throw_exception(cant_seek());
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(0)
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}
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template<typename Device>
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static std::streampos
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seek( Device& dev, stream_offset off,
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BOOST_IOS::seekdir way, BOOST_IOS::openmode which,
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random_access )
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{
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return iostreams::seek(dev, off, way, which);
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}
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template<typename Device, typename Dummy>
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static void close(Device& dev, Dummy*, BOOST_IOS::openmode which)
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{ iostreams::close(dev, which); }
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template<typename Device, typename Dummy>
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static bool flush(Device& dev, Dummy*)
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{ return iostreams::flush(dev); }
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};
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template<>
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struct device_wrapper_impl<input> : device_wrapper_impl<any_tag> {
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template<typename Device, typename Dummy>
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static std::streamsize
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read( Device& dev, Dummy*, typename char_type_of<Device>::type* s,
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std::streamsize n )
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{ return iostreams::read(dev, s, n); }
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template<typename Device, typename Dummy>
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static std::streamsize
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write( Device&, Dummy*, const typename char_type_of<Device>::type*,
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std::streamsize )
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{ boost::throw_exception(cant_write());
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) }
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};
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template<>
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struct device_wrapper_impl<output> {
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template<typename Device, typename Dummy>
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static std::streamsize
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read(Device&, Dummy*, typename char_type_of<Device>::type*, std::streamsize)
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{ boost::throw_exception(cant_read());
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) }
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template<typename Device, typename Dummy>
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static std::streamsize
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write( Device& dev, Dummy*, const typename char_type_of<Device>::type* s,
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std::streamsize n )
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{ return iostreams::write(dev, s, n); }
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};
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//------------------Specializations of flt_wrapper_impl--------------------//
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template<>
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struct flt_wrapper_impl<any_tag> {
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template<typename Filter, typename Device>
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static std::streampos
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seek( Filter& f, Device* dev, stream_offset off,
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BOOST_IOS::seekdir way, BOOST_IOS::openmode which )
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{
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typedef typename category_of<Filter>::type category;
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return seek(f, dev, off, way, which, category());
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}
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template<typename Filter, typename Device>
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static std::streampos
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seek( Filter&, Device*, stream_offset,
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BOOST_IOS::seekdir, BOOST_IOS::openmode, any_tag )
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{ boost::throw_exception(cant_seek());
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) }
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template<typename Filter, typename Device>
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static std::streampos
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seek( Filter& f, Device* dev, stream_offset off,
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BOOST_IOS::seekdir way, BOOST_IOS::openmode which,
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random_access tag )
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{
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typedef typename category_of<Filter>::type category;
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return seek(f, dev, off, way, which, tag, category());
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}
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template<typename Filter, typename Device>
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static std::streampos
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seek( Filter& f, Device* dev, stream_offset off,
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BOOST_IOS::seekdir way, BOOST_IOS::openmode,
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random_access, any_tag )
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{ return f.seek(*dev, off, way); }
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template<typename Filter, typename Device>
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static std::streampos
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seek( Filter& f, Device* dev, stream_offset off,
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BOOST_IOS::seekdir way, BOOST_IOS::openmode which,
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random_access, two_sequence )
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{ return f.seek(*dev, off, way, which); }
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template<typename Filter, typename Device>
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static void close(Filter& f, Device* dev, BOOST_IOS::openmode which)
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{ iostreams::close(f, *dev, which); }
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template<typename Filter, typename Device>
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static bool flush(Filter& f, Device* dev)
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{ return iostreams::flush(f, *dev); }
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};
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template<>
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struct flt_wrapper_impl<input> {
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template<typename Filter, typename Source>
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static std::streamsize
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read( Filter& f, Source* src, typename char_type_of<Filter>::type* s,
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std::streamsize n )
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{ return iostreams::read(f, *src, s, n); }
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template<typename Filter, typename Sink>
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static std::streamsize
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write( Filter&, Sink*, const typename char_type_of<Filter>::type*,
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std::streamsize )
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{ boost::throw_exception(cant_write());
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) }
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};
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template<>
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struct flt_wrapper_impl<output> {
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template<typename Filter, typename Source>
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static std::streamsize
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read(Filter&, Source*, typename char_type_of<Filter>::type*,std::streamsize)
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{ boost::throw_exception(cant_read());
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) }
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template<typename Filter, typename Sink>
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static std::streamsize
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write( Filter& f, Sink* snk, const typename char_type_of<Filter>::type* s,
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std::streamsize n )
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{ return iostreams::write(f, *snk, s, n); }
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};
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//----------------------------------------------------------------------------//
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} } } // End namespaces detail, iostreams, boost.
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#include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC.
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_CONCEPT_ADAPTER_HPP_INCLUDED
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