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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
// (C) Copyright 2004-2007 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_FILTER_STREAM_HPP_INCLUDED
#define BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
#if defined(_MSC_VER)
# pragma once
#endif
#include <memory> // allocator.
#include <boost/iostreams/detail/access_control.hpp>
#include <boost/iostreams/detail/char_traits.hpp>
#include <boost/iostreams/detail/iostream.hpp> // standard streams.
#include <boost/iostreams/detail/push.hpp>
#include <boost/iostreams/detail/select.hpp>
#include <boost/iostreams/detail/streambuf.hpp> // pubsync.
#include <boost/iostreams/filtering_streambuf.hpp>
#include <boost/mpl/and.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_convertible.hpp>
// Must come last.
#include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC.
namespace boost { namespace iostreams {
//--------------Definition of filtered_istream--------------------------------//
namespace detail {
template<typename Mode, typename Ch, typename Tr>
struct filtering_stream_traits {
typedef typename
iostreams::select< // Disambiguation for Tru64
mpl::and_<
is_convertible<Mode, input>,
is_convertible<Mode, output>
>,
BOOST_IOSTREAMS_BASIC_IOSTREAM(Ch, Tr),
is_convertible<Mode, input>,
BOOST_IOSTREAMS_BASIC_ISTREAM(Ch, Tr),
else_,
BOOST_IOSTREAMS_BASIC_OSTREAM(Ch, Tr)
>::type stream_type;
typedef typename
iostreams::select< // Dismbiguation required for Tru64.
mpl::and_<
is_convertible<Mode, input>,
is_convertible<Mode, output>
>,
iostream_tag,
is_convertible<Mode, input>,
istream_tag,
else_,
ostream_tag
>::type stream_tag;
};
template<typename Chain, typename Access>
class filtering_stream_base
: public access_control<
boost::iostreams::detail::chain_client<Chain>,
Access
>,
public filtering_stream_traits<
typename Chain::mode,
typename Chain::char_type,
typename Chain::traits_type
>::stream_type
{
public:
typedef Chain chain_type;
typedef access_control<
boost::iostreams::detail::chain_client<Chain>,
Access
> client_type;
protected:
typedef typename
filtering_stream_traits<
typename Chain::mode,
typename Chain::char_type,
typename Chain::traits_type
>::stream_type stream_type;
filtering_stream_base() : stream_type(0) { this->set_chain(&chain_); }
private:
void notify() { this->rdbuf(chain_.empty() ? 0 : &chain_.front()); }
Chain chain_;
};
} // End namespace detail.
//
// Macro: BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_)
// Description: Defines a template derived from std::basic_streambuf which uses
// a chain to perform i/o. The template has the following parameters:
// Mode - the i/o mode.
// Ch - The character type.
// Tr - The character traits type.
// Alloc - The allocator type.
// Access - Indicates accessibility of the chain interface; must be either
// public_ or protected_; defaults to public_.
// Macro parameters:
// name_ - The name of the template to be defined.
// chain_type_ - The name of the chain template.
// default_char_ - The default value for the char template parameter.
//
#define BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) \
template< typename Mode, \
typename Ch = default_char_, \
typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch), \
typename Alloc = std::allocator<Ch>, \
typename Access = public_ > \
class name_ \
: public boost::iostreams::detail::filtering_stream_base< \
chain_type_<Mode, Ch, Tr, Alloc>, Access \
> \
{ \
public: \
typedef Ch char_type; \
struct category \
: Mode, \
closable_tag, \
detail::filtering_stream_traits<Mode, Ch, Tr>::stream_tag \
{ }; \
BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \
typedef Mode mode; \
typedef chain_type_<Mode, Ch, Tr, Alloc> chain_type; \
name_() { } \
BOOST_IOSTREAMS_DEFINE_PUSH_CONSTRUCTOR(name_, mode, Ch, push_impl) \
~name_() { \
if (this->is_complete()) \
this->rdbuf()->BOOST_IOSTREAMS_PUBSYNC(); \
} \
private: \
typedef access_control< \
boost::iostreams::detail::chain_client< \
chain_type_<Mode, Ch, Tr, Alloc> \
>, \
Access \
> client_type; \
template<typename T> \
void push_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS()) \
{ client_type::push(t BOOST_IOSTREAMS_PUSH_ARGS()); } \
}; \
/**/
BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(filtering_stream, boost::iostreams::chain, char)
BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(wfiltering_stream, boost::iostreams::chain, wchar_t)
typedef filtering_stream<input> filtering_istream;
typedef filtering_stream<output> filtering_ostream;
typedef wfiltering_stream<input> filtering_wistream;
typedef wfiltering_stream<output> filtering_wostream;
//----------------------------------------------------------------------------//
} } // End namespace iostreams, boost
#include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC
#endif // #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
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