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// (C) Copyright Jonathan Turkanis 2003.
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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_CLOSER_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_CLOSER_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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#include <exception> // exception.
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#include <boost/iostreams/detail/ios.hpp> // openmode.
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#include <boost/iostreams/operations.hpp> // close
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#include <boost/iostreams/traits.hpp> // is_device.
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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 T>
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struct closer {
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closer(T& t) : t_(&t) { }
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~closer() { try { t_->close(); } catch (std::exception&) { } }
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T* t_;
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};
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template<typename Device>
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struct external_device_closer {
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external_device_closer(Device& dev, BOOST_IOS::openmode which)
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: device_(&dev), which_(which),
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dummy_(true), nothrow_(dummy_)
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{ }
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external_device_closer(Device& dev, BOOST_IOS::openmode which, bool& nothrow)
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: device_(&dev), which_(which),
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dummy_(true), nothrow_(nothrow)
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{ }
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~external_device_closer()
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{
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try {
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boost::iostreams::close(*device_, which_);
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} catch (...) {
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if (!nothrow_) {
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nothrow_ = true;
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throw;
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}
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}
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}
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Device* device_;
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BOOST_IOS::openmode which_;
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bool dummy_;
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bool& nothrow_;
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};
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template<typename Filter, typename Device>
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struct external_filter_closer {
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external_filter_closer(Filter& flt, Device& dev, BOOST_IOS::openmode which)
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: filter_(flt), device_(dev), which_(which),
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dummy_(true), nothrow_(dummy_)
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{ }
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external_filter_closer( Filter& flt, Device& dev,
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BOOST_IOS::openmode which, bool& nothrow )
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: filter_(flt), device_(dev), which_(which),
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dummy_(true), nothrow_(nothrow)
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{ }
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~external_filter_closer()
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{
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try {
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boost::iostreams::close(filter_, device_, which_);
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} catch (...) {
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if (!nothrow_) {
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nothrow_ = true;
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throw;
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}
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}
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}
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Filter& filter_;
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Device& device_;
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BOOST_IOS::openmode which_;
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bool dummy_;
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bool& nothrow_;
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};
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template<typename FilterOrDevice, typename DeviceOrDummy = int>
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struct external_closer_traits {
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typedef typename
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mpl::if_<
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is_device<FilterOrDevice>,
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external_device_closer<FilterOrDevice>,
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external_filter_closer<FilterOrDevice, DeviceOrDummy>
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>::type type;
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};
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template<typename FilterOrDevice, typename DeviceOrDummy = int>
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struct external_closer
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: external_closer_traits<FilterOrDevice, DeviceOrDummy>::type
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{
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typedef typename
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external_closer_traits<
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FilterOrDevice, DeviceOrDummy
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>::type base_type;
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external_closer(FilterOrDevice& dev, BOOST_IOS::openmode which)
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: base_type(dev, which)
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{ BOOST_STATIC_ASSERT(is_device<FilterOrDevice>::value); };
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external_closer( FilterOrDevice& dev, BOOST_IOS::openmode which,
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bool& nothrow )
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: base_type(dev, which, nothrow)
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{ BOOST_STATIC_ASSERT(is_device<FilterOrDevice>::value); };
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external_closer( FilterOrDevice& flt, DeviceOrDummy& dev,
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BOOST_IOS::openmode which )
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: base_type(flt, dev, which)
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{ BOOST_STATIC_ASSERT(is_filter<FilterOrDevice>::value); };
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external_closer( FilterOrDevice& flt, DeviceOrDummy& dev,
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BOOST_IOS::openmode which, bool& nothrow )
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: base_type(flt, dev, which, nothrow)
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{ BOOST_STATIC_ASSERT(is_filter<FilterOrDevice>::value); };
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};
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} } } // End namespaces detail, iostreams, boost.
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_CLOSER_HPP_INCLUDED
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