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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
// (C) Copyright 2003-2007 Jonathan Turkanis
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
// See http://www.boost.org/libs/iostreams for documentation.
#ifndef BOOST_IOSTREAMS_CLOSE_HPP_INCLUDED
#define BOOST_IOSTREAMS_CLOSE_HPP_INCLUDED
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC.
#include <boost/detail/workaround.hpp>
#include <boost/iostreams/categories.hpp>
#include <boost/iostreams/flush.hpp>
#include <boost/iostreams/detail/adapter/non_blocking_adapter.hpp>
#include <boost/iostreams/detail/ios.hpp> // BOOST_IOS
#include <boost/iostreams/detail/select.hpp>
#include <boost/iostreams/detail/wrap_unwrap.hpp>
#include <boost/iostreams/operations_fwd.hpp>
#include <boost/iostreams/traits.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/mpl/if.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/type_traits/is_integral.hpp>
#include <boost/type_traits/remove_cv.hpp>
#include <boost/type_traits/remove_reference.hpp>
// Must come last.
#include <boost/iostreams/detail/config/disable_warnings.hpp>
namespace boost { namespace iostreams {
template<typename T>
void close(T& t);
template<typename T>
void close(T& t, BOOST_IOS::openmode which);
template<typename T, typename Sink>
void close(T& t, Sink& snk, BOOST_IOS::openmode which);
namespace detail {
template<typename T>
void close_all(T& t)
{
try {
boost::iostreams::close(t, BOOST_IOS::in);
} catch (...) {
try {
boost::iostreams::close(t, BOOST_IOS::out);
} catch (...) { }
throw;
}
boost::iostreams::close(t, BOOST_IOS::out);
}
template<typename T, typename Sink>
void close_all(T& t, Sink& snk)
{
try {
boost::iostreams::close(t, snk, BOOST_IOS::in);
} catch (...) {
try {
boost::iostreams::close(t, snk, BOOST_IOS::out);
} catch (...) { }
throw;
}
boost::iostreams::close(t, snk, BOOST_IOS::out);
}
} // End namespace detail.
} } // End namespaces iostreams, boost.
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-----------------------------------//
# include <boost/iostreams/detail/vc6/close.hpp>
#else // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //--------------------------//
namespace boost { namespace iostreams {
namespace detail {
template<typename T>
struct close_impl;
} // End namespace detail.
template<typename T>
void close(T& t) { detail::close_all(t); }
template<typename T>
void close(T& t, BOOST_IOS::openmode which)
{
#ifdef BOOST_IOSTREAMS_STRICT
BOOST_ASSERT(which == BOOST_IOS::in || which == BOOST_IOS::out);
#else
if (which == (BOOST_IOS::in | BOOST_IOS::out)) {
detail::close_all(t);
return;
}
#endif
detail::close_impl<T>::close(detail::unwrap(t), which);
}
template<typename T, typename Sink>
void close(T& t, Sink& snk, BOOST_IOS::openmode which)
{
#ifdef BOOST_IOSTREAMS_STRICT
BOOST_ASSERT(which == BOOST_IOS::in || which == BOOST_IOS::out);
#else
if (which == (BOOST_IOS::in | BOOST_IOS::out)) {
detail::close_all(t, snk);
return;
}
#endif
detail::close_impl<T>::close(detail::unwrap(t), snk, which);
}
namespace detail {
//------------------Definition of close_impl----------------------------------//
struct close_boost_stream { };
struct close_filtering_stream { };
template<typename T>
struct close_tag {
typedef typename category_of<T>::type category;
typedef typename detail::unwrapped_type<T>::type unwrapped;
typedef typename
iostreams::select<
mpl::not_< is_convertible<category, closable_tag> >,
any_tag,
mpl::or_<
is_boost_stream<unwrapped>,
is_boost_stream_buffer<unwrapped>
>,
close_boost_stream,
mpl::or_<
is_filtering_stream<unwrapped>,
is_filtering_streambuf<unwrapped>
>,
close_filtering_stream,
mpl::or_<
is_convertible<category, two_sequence>,
is_convertible<category, dual_use>
>,
two_sequence,
else_,
closable_tag
>::type type;
};
template<typename T>
struct close_impl
: mpl::if_<
is_custom<T>,
operations<T>,
close_impl<BOOST_DEDUCED_TYPENAME close_tag<T>::type>
>::type
{ };
template<>
struct close_impl<any_tag> {
template<typename T>
static void close(T& t, BOOST_IOS::openmode which)
{
if (which == BOOST_IOS::out)
iostreams::flush(t);
}
template<typename T, typename Sink>
static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
{
if (which == BOOST_IOS::out) {
non_blocking_adapter<Sink> nb(snk);
iostreams::flush(t, nb);
}
}
};
template<>
struct close_impl<close_boost_stream> {
template<typename T>
static void close(T& t)
{
t.close();
}
template<typename T>
static void close(T& t, BOOST_IOS::openmode which)
{
if (which == BOOST_IOS::out)
t.close();
}
};
template<>
struct close_impl<close_filtering_stream> {
template<typename T>
static void close(T& t, BOOST_IOS::openmode which)
{
typedef typename category_of<T>::type category;
const bool in = is_convertible<category, input>::value &&
!is_convertible<category, output>::value;
if (in == (which == BOOST_IOS::in) && t.is_complete())
t.pop();
}
};
template<>
struct close_impl<closable_tag> {
template<typename T>
static void close(T& t, BOOST_IOS::openmode which)
{
typedef typename category_of<T>::type category;
const bool in = is_convertible<category, input>::value &&
!is_convertible<category, output>::value;
if (in == (which == BOOST_IOS::in))
t.close();
}
template<typename T, typename Sink>
static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
{
typedef typename category_of<T>::type category;
const bool in = is_convertible<category, input>::value &&
!is_convertible<category, output>::value;
if (in == (which == BOOST_IOS::in)) {
non_blocking_adapter<Sink> nb(snk);
t.close(nb);
}
}
};
template<>
struct close_impl<two_sequence> {
template<typename T>
static void close(T& t, BOOST_IOS::openmode which) { t.close(which); }
template<typename T, typename Sink>
static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
{
non_blocking_adapter<Sink> nb(snk);
t.close(nb, which);
}
};
} // End namespace detail.
} } // End namespaces iostreams, boost.
#endif // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-------------------------//
#include <boost/iostreams/detail/config/enable_warnings.hpp>
#endif // #ifndef BOOST_IOSTREAMS_CLOSE_HPP_INCLUDED
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