// (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) && (_MSC_VER >= 1020) | |
# 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 |