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253 lines
6.8 KiB
253 lines
6.8 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_CLOSE_HPP_INCLUDED |
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#define BOOST_IOSTREAMS_CLOSE_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 <boost/config.hpp> // DEDUCED_TYPENAME, 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/flush.hpp> |
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#include <boost/iostreams/detail/adapter/non_blocking_adapter.hpp> |
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#include <boost/iostreams/detail/ios.hpp> // BOOST_IOS |
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#include <boost/iostreams/detail/select.hpp> |
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#include <boost/iostreams/detail/wrap_unwrap.hpp> |
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#include <boost/iostreams/operations_fwd.hpp> |
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#include <boost/iostreams/traits.hpp> |
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#include <boost/mpl/identity.hpp> |
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#include <boost/mpl/if.hpp> |
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#include <boost/type_traits/is_convertible.hpp> |
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#include <boost/type_traits/is_integral.hpp> |
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#include <boost/type_traits/remove_cv.hpp> |
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#include <boost/type_traits/remove_reference.hpp> |
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// Must come last. |
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#include <boost/iostreams/detail/config/disable_warnings.hpp> |
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namespace boost { namespace iostreams { |
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template<typename T> |
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void close(T& t); |
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template<typename T> |
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void close(T& t, BOOST_IOS::openmode which); |
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template<typename T, typename Sink> |
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void close(T& t, Sink& snk, BOOST_IOS::openmode which); |
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namespace detail { |
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template<typename T> |
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void close_all(T& t) |
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{ |
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try { |
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boost::iostreams::close(t, BOOST_IOS::in); |
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} catch (...) { |
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try { |
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boost::iostreams::close(t, BOOST_IOS::out); |
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} catch (...) { } |
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throw; |
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} |
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boost::iostreams::close(t, BOOST_IOS::out); |
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} |
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template<typename T, typename Sink> |
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void close_all(T& t, Sink& snk) |
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{ |
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try { |
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boost::iostreams::close(t, snk, BOOST_IOS::in); |
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} catch (...) { |
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try { |
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boost::iostreams::close(t, snk, BOOST_IOS::out); |
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} catch (...) { } |
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throw; |
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} |
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boost::iostreams::close(t, snk, BOOST_IOS::out); |
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} |
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} // End namespace detail. |
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} } // End namespaces iostreams, boost. |
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namespace boost { namespace iostreams { |
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namespace detail { |
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template<typename T> |
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struct close_impl; |
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} // End namespace detail. |
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template<typename T> |
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void close(T& t) { detail::close_all(t); } |
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template<typename T> |
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void close(T& t, BOOST_IOS::openmode which) |
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{ |
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#ifdef BOOST_IOSTREAMS_STRICT |
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BOOST_ASSERT(which == BOOST_IOS::in || which == BOOST_IOS::out); |
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#else |
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if (which == (BOOST_IOS::in | BOOST_IOS::out)) { |
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detail::close_all(t); |
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return; |
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} |
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#endif |
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detail::close_impl<T>::close(detail::unwrap(t), which); |
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} |
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template<typename T, typename Sink> |
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void close(T& t, Sink& snk, BOOST_IOS::openmode which) |
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{ |
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#ifdef BOOST_IOSTREAMS_STRICT |
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BOOST_ASSERT(which == BOOST_IOS::in || which == BOOST_IOS::out); |
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#else |
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if (which == (BOOST_IOS::in | BOOST_IOS::out)) { |
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detail::close_all(t, snk); |
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return; |
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} |
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#endif |
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detail::close_impl<T>::close(detail::unwrap(t), snk, which); |
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} |
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namespace detail { |
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//------------------Definition of close_impl----------------------------------// |
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struct close_boost_stream { }; |
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struct close_filtering_stream { }; |
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template<typename T> |
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struct close_tag { |
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typedef typename category_of<T>::type category; |
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typedef typename detail::unwrapped_type<T>::type unwrapped; |
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typedef typename |
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iostreams::select< |
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mpl::not_< is_convertible<category, closable_tag> >, |
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any_tag, |
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mpl::or_< |
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is_boost_stream<unwrapped>, |
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is_boost_stream_buffer<unwrapped> |
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>, |
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close_boost_stream, |
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mpl::or_< |
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is_filtering_stream<unwrapped>, |
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is_filtering_streambuf<unwrapped> |
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>, |
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close_filtering_stream, |
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mpl::or_< |
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is_convertible<category, two_sequence>, |
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is_convertible<category, dual_use> |
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>, |
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two_sequence, |
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else_, |
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closable_tag |
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>::type type; |
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}; |
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template<typename T> |
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struct close_impl |
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: mpl::if_< |
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is_custom<T>, |
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operations<T>, |
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close_impl<BOOST_DEDUCED_TYPENAME close_tag<T>::type> |
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>::type |
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{ }; |
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template<> |
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struct close_impl<any_tag> { |
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template<typename T> |
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static void close(T& t, BOOST_IOS::openmode which) |
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{ |
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if (which == BOOST_IOS::out) |
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iostreams::flush(t); |
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} |
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template<typename T, typename Sink> |
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static void close(T& t, Sink& snk, BOOST_IOS::openmode which) |
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{ |
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if (which == BOOST_IOS::out) { |
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non_blocking_adapter<Sink> nb(snk); |
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iostreams::flush(t, nb); |
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} |
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} |
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}; |
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template<> |
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struct close_impl<close_boost_stream> { |
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template<typename T> |
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static void close(T& t) |
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{ |
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t.close(); |
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} |
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template<typename T> |
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static void close(T& t, BOOST_IOS::openmode which) |
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{ |
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if (which == BOOST_IOS::out) |
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t.close(); |
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} |
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}; |
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template<> |
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struct close_impl<close_filtering_stream> { |
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template<typename T> |
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static void close(T& t, BOOST_IOS::openmode which) |
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{ |
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typedef typename category_of<T>::type category; |
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const bool in = is_convertible<category, input>::value && |
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!is_convertible<category, output>::value; |
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if (in == (which == BOOST_IOS::in) && t.is_complete()) |
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t.pop(); |
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} |
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}; |
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template<> |
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struct close_impl<closable_tag> { |
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template<typename T> |
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static void close(T& t, BOOST_IOS::openmode which) |
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{ |
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typedef typename category_of<T>::type category; |
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const bool in = is_convertible<category, input>::value && |
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!is_convertible<category, output>::value; |
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if (in == (which == BOOST_IOS::in)) |
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t.close(); |
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} |
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template<typename T, typename Sink> |
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static void close(T& t, Sink& snk, BOOST_IOS::openmode which) |
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{ |
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typedef typename category_of<T>::type category; |
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const bool in = is_convertible<category, input>::value && |
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!is_convertible<category, output>::value; |
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if (in == (which == BOOST_IOS::in)) { |
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non_blocking_adapter<Sink> nb(snk); |
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t.close(nb); |
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} |
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} |
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}; |
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template<> |
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struct close_impl<two_sequence> { |
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template<typename T> |
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static void close(T& t, BOOST_IOS::openmode which) { t.close(which); } |
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template<typename T, typename Sink> |
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static void close(T& t, Sink& snk, BOOST_IOS::openmode which) |
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{ |
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non_blocking_adapter<Sink> nb(snk); |
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t.close(nb, which); |
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} |
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}; |
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} // End namespace detail. |
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} } // End namespaces iostreams, boost. |
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#include <boost/iostreams/detail/config/enable_warnings.hpp> |
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#endif // #ifndef BOOST_IOSTREAMS_CLOSE_HPP_INCLUDED
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