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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.
// To do: add support for random-access.
#ifndef BOOST_IOSTREAMS_COMBINE_HPP_INCLUDED
#define BOOST_IOSTREAMS_COMBINE_HPP_INCLUDED
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/config.hpp> // NO_STD_LOCALE, DEDUCED_TYPENAME.
#ifndef BOOST_NO_STD_LOCALE
# include <locale>
#endif
#include <boost/iostreams/detail/ios.hpp>
#include <boost/iostreams/detail/wrap_unwrap.hpp>
#include <boost/iostreams/traits.hpp>
#include <boost/iostreams/operations.hpp>
#include <boost/mpl/if.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/type_traits/is_same.hpp>
// Must come last.
#include <boost/iostreams/detail/config/disable_warnings.hpp>
namespace boost { namespace iostreams {
namespace detail {
//
// Template name: combined_device.
// Description: Model of Device defined in terms of a Source/Sink pair.
// Template parameters:
// Source - A model of Source, with the same char_type and traits_type
// as Sink.
// Sink - A model of Sink, with the same char_type and traits_type
// as Source.
//
template<typename Source, typename Sink>
class combined_device {
private:
typedef typename category_of<Source>::type in_category;
typedef typename category_of<Sink>::type out_category;
typedef typename char_type_of<Sink>::type sink_char_type;
public:
typedef typename char_type_of<Source>::type char_type;
struct category
: bidirectional,
device_tag,
closable_tag,
localizable_tag
{ };
BOOST_STATIC_ASSERT(is_device<Source>::value);
BOOST_STATIC_ASSERT(is_device<Sink>::value);
BOOST_STATIC_ASSERT((is_convertible<in_category, input>::value));
BOOST_STATIC_ASSERT((is_convertible<out_category, output>::value));
BOOST_STATIC_ASSERT((is_same<char_type, sink_char_type>::value));
combined_device(const Source& src, const Sink& snk);
std::streamsize read(char_type* s, std::streamsize n);
std::streamsize write(const char_type* s, std::streamsize n);
void close(BOOST_IOS::openmode);
#ifndef BOOST_NO_STD_LOCALE
void imbue(const std::locale& loc);
#endif
private:
Source src_;
Sink sink_;
};
//
// Template name: combined_filter.
// Description: Model of Device defined in terms of a Source/Sink pair.
// Template parameters:
// InputFilter - A model of InputFilter, with the same char_type as
// OutputFilter.
// OutputFilter - A model of OutputFilter, with the same char_type as
// InputFilter.
//
template<typename InputFilter, typename OutputFilter>
class combined_filter {
private:
typedef typename category_of<InputFilter>::type in_category;
typedef typename category_of<OutputFilter>::type out_category;
typedef typename char_type_of<OutputFilter>::type output_char_type;
public:
typedef typename char_type_of<InputFilter>::type char_type;
struct category
: multichar_bidirectional_filter_tag,
closable_tag,
localizable_tag
{ };
BOOST_STATIC_ASSERT(is_filter<InputFilter>::value);
BOOST_STATIC_ASSERT(is_filter<OutputFilter>::value);
BOOST_STATIC_ASSERT((is_convertible<in_category, input>::value));
BOOST_STATIC_ASSERT((is_convertible<out_category, output>::value));
BOOST_STATIC_ASSERT((is_same<char_type, output_char_type>::value));
combined_filter(const InputFilter& in, const OutputFilter& out);
template<typename Source>
std::streamsize read(Source& src, char_type* s, std::streamsize n)
{ return boost::iostreams::read(in_, src, s, n); }
template<typename Sink>
std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
{ return boost::iostreams::write(out_, snk, s, n); }
template<typename Sink>
void close(Sink& snk, BOOST_IOS::openmode which)
{
if (which == BOOST_IOS::in) {
if (is_convertible<in_category, dual_use>::value) {
iostreams::close(in_, snk, BOOST_IOS::in);
} else {
detail::close_all(in_, snk);
}
}
if (which == BOOST_IOS::out) {
if (is_convertible<out_category, dual_use>::value) {
iostreams::close(out_, snk, BOOST_IOS::out);
} else {
detail::close_all(out_, snk);
}
}
}
#ifndef BOOST_NO_STD_LOCALE
void imbue(const std::locale& loc);
#endif
private:
InputFilter in_;
OutputFilter out_;
};
template<typename In, typename Out>
struct combination_traits
: mpl::if_<
is_device<In>,
combined_device<
typename wrapped_type<In>::type,
typename wrapped_type<Out>::type
>,
combined_filter<
typename wrapped_type<In>::type,
typename wrapped_type<Out>::type
>
>
{ };
} // End namespace detail.
template<typename In, typename Out>
struct combination : detail::combination_traits<In, Out>::type {
typedef typename detail::combination_traits<In, Out>::type base_type;
typedef typename detail::wrapped_type<In>::type in_type;
typedef typename detail::wrapped_type<Out>::type out_type;
combination(const in_type& in, const out_type& out)
: base_type(in, out) { }
};
namespace detail {
// Workaround for VC6 ETI bug.
template<typename In, typename Out>
struct combine_traits {
typedef combination<
BOOST_DEDUCED_TYPENAME detail::unwrapped_type<In>::type,
BOOST_DEDUCED_TYPENAME detail::unwrapped_type<Out>::type
> type;
};
} // End namespace detail.
//
// Template name: combine.
// Description: Takes a Source/Sink pair or InputFilter/OutputFilter pair and
// returns a Source or Filter which performs input using the first member
// of the pair and output using the second member of the pair.
// Template parameters:
// In - A model of Source or InputFilter, with the same char_type as Out.
// Out - A model of Sink or OutputFilter, with the same char_type as In.
//
template<typename In, typename Out>
typename detail::combine_traits<In, Out>::type
combine(const In& in, const Out& out)
{
typedef typename detail::combine_traits<In, Out>::type return_type;
return return_type(in, out);
}
//----------------------------------------------------------------------------//
namespace detail {
//--------------Implementation of combined_device-----------------------------//
template<typename Source, typename Sink>
inline combined_device<Source, Sink>::combined_device
(const Source& src, const Sink& snk)
: src_(src), sink_(snk) { }
template<typename Source, typename Sink>
inline std::streamsize
combined_device<Source, Sink>::read(char_type* s, std::streamsize n)
{ return iostreams::read(src_, s, n); }
template<typename Source, typename Sink>
inline std::streamsize
combined_device<Source, Sink>::write(const char_type* s, std::streamsize n)
{ return iostreams::write(sink_, s, n); }
template<typename Source, typename Sink>
inline void
combined_device<Source, Sink>::close(BOOST_IOS::openmode which)
{
if (which == BOOST_IOS::in)
detail::close_all(src_);
if (which == BOOST_IOS::out)
detail::close_all(sink_);
}
#ifndef BOOST_NO_STD_LOCALE
template<typename Source, typename Sink>
void combined_device<Source, Sink>::imbue(const std::locale& loc)
{
iostreams::imbue(src_, loc);
iostreams::imbue(sink_, loc);
}
#endif
//--------------Implementation of filter_pair---------------------------------//
template<typename InputFilter, typename OutputFilter>
inline combined_filter<InputFilter, OutputFilter>::combined_filter
(const InputFilter& in, const OutputFilter& out) : in_(in), out_(out)
{ }
#ifndef BOOST_NO_STD_LOCALE
template<typename InputFilter, typename OutputFilter>
void combined_filter<InputFilter, OutputFilter>::imbue
(const std::locale& loc)
{
iostreams::imbue(in_, loc);
iostreams::imbue(out_, loc);
}
#endif
} // End namespace detail.
} } // End namespaces iostreams, boost.
#include <boost/iostreams/detail/config/enable_warnings.hpp>
#endif // #ifndef BOOST_IOSTREAMS_COMBINE_HPP_INCLUDED
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