// (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_DETAIL_CHAINBUF_HPP_INCLUDED | |
#define BOOST_IOSTREAMS_DETAIL_CHAINBUF_HPP_INCLUDED | |
#if defined(_MSC_VER) && (_MSC_VER >= 1020) | |
# pragma once | |
#endif | |
#include <boost/config.hpp> // BOOST_MSVC, template friends. | |
#include <boost/detail/workaround.hpp> | |
#include <boost/iostreams/chain.hpp> | |
#include <boost/iostreams/detail/access_control.hpp> | |
#include <boost/iostreams/detail/config/wide_streams.hpp> | |
#include <boost/iostreams/detail/streambuf.hpp> | |
#include <boost/iostreams/detail/streambuf/linked_streambuf.hpp> | |
#include <boost/iostreams/detail/translate_int_type.hpp> | |
#include <boost/iostreams/traits.hpp> | |
#include <boost/noncopyable.hpp> | |
namespace boost { namespace iostreams { namespace detail { | |
//--------------Definition of chainbuf----------------------------------------// | |
// | |
// Template name: chainbuf. | |
// Description: Stream buffer which operates by delegating to the first | |
// linked_streambuf in a chain. | |
// Template paramters: | |
// Chain - The chain type. | |
// | |
template<typename Chain, typename Mode, typename Access> | |
class chainbuf | |
: public BOOST_IOSTREAMS_BASIC_STREAMBUF( | |
typename Chain::char_type, | |
typename Chain::traits_type | |
), | |
public access_control<typename Chain::client_type, Access>, | |
private noncopyable | |
{ | |
private: | |
typedef access_control<chain_client<Chain>, Access> client_type; | |
public: | |
typedef typename Chain::char_type char_type; | |
BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(typename Chain::traits_type) | |
protected: | |
typedef linked_streambuf<char_type, traits_type> delegate_type; | |
chainbuf() { client_type::set_chain(&chain_); } | |
int_type underflow() | |
{ sentry t(this); return translate(delegate().underflow()); } | |
int_type pbackfail(int_type c) | |
{ sentry t(this); return translate(delegate().pbackfail(c)); } | |
std::streamsize xsgetn(char_type* s, std::streamsize n) | |
{ sentry t(this); return delegate().xsgetn(s, n); } | |
int_type overflow(int_type c) | |
{ sentry t(this); return translate(delegate().overflow(c)); } | |
std::streamsize xsputn(const char_type* s, std::streamsize n) | |
{ sentry t(this); return delegate().xsputn(s, n); } | |
int sync() { sentry t(this); return delegate().sync(); } | |
pos_type seekoff( off_type off, BOOST_IOS::seekdir way, | |
BOOST_IOS::openmode which = | |
BOOST_IOS::in | BOOST_IOS::out ) | |
{ sentry t(this); return delegate().seekoff(off, way, which); } | |
pos_type seekpos( pos_type sp, | |
BOOST_IOS::openmode which = | |
BOOST_IOS::in | BOOST_IOS::out ) | |
{ sentry t(this); return delegate().seekpos(sp, which); } | |
protected: | |
typedef BOOST_IOSTREAMS_BASIC_STREAMBUF( | |
typename Chain::char_type, | |
typename Chain::traits_type | |
) base_type; | |
//#if !BOOST_WORKAROUND(__GNUC__, == 2) | |
// BOOST_IOSTREAMS_USING_PROTECTED_STREAMBUF_MEMBERS(base_type) | |
//#endif | |
private: | |
// Translate from std int_type to chain's int_type. | |
typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type) std_traits; | |
typedef typename Chain::traits_type chain_traits; | |
static typename chain_traits::int_type | |
translate(typename std_traits::int_type c) | |
{ return translate_int_type<std_traits, chain_traits>(c); } | |
delegate_type& delegate() | |
{ return static_cast<delegate_type&>(chain_.front()); } | |
void get_pointers() | |
{ | |
this->setg(delegate().eback(), delegate().gptr(), delegate().egptr()); | |
this->setp(delegate().pbase(), delegate().epptr()); | |
this->pbump((int) (delegate().pptr() - delegate().pbase())); | |
} | |
void set_pointers() | |
{ | |
delegate().setg(this->eback(), this->gptr(), this->egptr()); | |
delegate().setp(this->pbase(), this->epptr()); | |
delegate().pbump((int) (this->pptr() - this->pbase())); | |
} | |
struct sentry { | |
sentry(chainbuf<Chain, Mode, Access>* buf) : buf_(buf) | |
{ buf_->set_pointers(); } | |
~sentry() { buf_->get_pointers(); } | |
chainbuf<Chain, Mode, Access>* buf_; | |
}; | |
friend struct sentry; | |
Chain chain_; | |
}; | |
} } } // End namespaces detail, iostreams, boost. | |
#endif // #ifndef BOOST_IOSTREAMS_DETAIL_CHAINBUF_HPP_INCLUDED |