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/Src/Dependencies/Boost/boost/iostreams/stream.hpp

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  1// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
  2// (C) Copyright 2003-2007 Jonathan Turkanis
  3// Distributed under the Boost Software License, Version 1.0. (See accompanying
  4// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
  5
  6// See http://www.boost.org/libs/iostreams for documentation.
  7
  8#ifndef BOOST_IOSTREAMS_STREAM_HPP_INCLUDED
  9#define BOOST_IOSTREAMS_STREAM_HPP_INCLUDED
 10
 11#if defined(_MSC_VER) && (_MSC_VER >= 1020)
 12# pragma once
 13#endif
 14
 15#include <boost/iostreams/constants.hpp>
 16#include <boost/iostreams/detail/char_traits.hpp>
 17#include <boost/iostreams/detail/config/overload_resolution.hpp>
 18#include <boost/iostreams/detail/forward.hpp>
 19#include <boost/iostreams/detail/iostream.hpp>  // standard streams.
 20#include <boost/iostreams/detail/select.hpp>
 21#include <boost/iostreams/stream_buffer.hpp>
 22#include <boost/mpl/and.hpp>
 23#include <boost/type_traits/is_convertible.hpp>
 24#include <boost/utility/base_from_member.hpp>
 25
 26namespace boost { namespace iostreams { namespace detail {
 27
 28template<typename Device, typename Tr>
 29struct stream_traits {
 30    typedef typename char_type_of<Device>::type                char_type;
 31    typedef Tr                                                 traits_type;
 32    typedef typename category_of<Device>::type                 mode;
 33    typedef typename
 34            iostreams::select< // Dismbiguation required for Tru64.
 35                mpl::and_<
 36                    is_convertible<mode, input>,
 37                    is_convertible<mode, output>
 38                >,
 39                BOOST_IOSTREAMS_BASIC_IOSTREAM(char_type, traits_type),
 40                is_convertible<mode, input>,
 41                BOOST_IOSTREAMS_BASIC_ISTREAM(char_type, traits_type),
 42                else_,
 43                BOOST_IOSTREAMS_BASIC_OSTREAM(char_type, traits_type)
 44            >::type stream_type;
 45    typedef typename
 46            iostreams::select< // Dismbiguation required for Tru64.
 47                mpl::and_<
 48                    is_convertible<mode, input>,
 49                    is_convertible<mode, output>
 50                >,
 51                iostream_tag,
 52                is_convertible<mode, input>,
 53                istream_tag,
 54                else_,
 55                ostream_tag
 56            >::type stream_tag;
 57};
 58
 59// By encapsulating initialization in a base, we can define the macro
 60// BOOST_IOSTREAMS_DEFINE_FORWARDING_FUNCTIONS to generate constuctors
 61// without base member initializer lists.
 62template< typename Device,
 63          typename Tr =
 64              BOOST_IOSTREAMS_CHAR_TRAITS(
 65                  BOOST_DEDUCED_TYPENAME char_type_of<Device>::type
 66              ),
 67          typename Alloc =
 68              std::allocator<
 69                  BOOST_DEDUCED_TYPENAME char_type_of<Device>::type
 70              >,
 71          typename Base = // VC6 Workaround.
 72              BOOST_DEDUCED_TYPENAME
 73              detail::stream_traits<Device, Tr>::stream_type >
 74class stream_base
 75    : protected base_from_member< stream_buffer<Device, Tr, Alloc> >,
 76      public Base
 77{
 78private:
 79    typedef base_from_member< stream_buffer<Device, Tr, Alloc> >  pbase_type;
 80    typedef typename stream_traits<Device, Tr>::stream_type       stream_type;
 81protected:
 82    using pbase_type::member; // Avoid warning about 'this' in initializer list.
 83public:
 84    stream_base() : pbase_type(), stream_type(&member) { }
 85};
 86
 87} } } // End namespaces detail, iostreams, boost.
 88
 89#ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION
 90# include <boost/iostreams/detail/broken_overload_resolution/stream.hpp>
 91#else
 92
 93namespace boost { namespace iostreams {
 94
 95//
 96// Template name: stream.
 97// Description: A iostream which reads from and writes to an instance of a
 98//      designated device type.
 99// Template paramters:
100//      Device - A device type.
101//      Alloc - The allocator type.
102//
103template< typename Device,
104          typename Tr =
105              BOOST_IOSTREAMS_CHAR_TRAITS(
106                  BOOST_DEDUCED_TYPENAME char_type_of<Device>::type
107              ),
108          typename Alloc =
109              std::allocator<
110                  BOOST_DEDUCED_TYPENAME char_type_of<Device>::type
111              > >
112struct stream : detail::stream_base<Device, Tr, Alloc> {
113public:
114    typedef typename char_type_of<Device>::type  char_type;
115    struct category 
116        : mode_of<Device>::type,
117          closable_tag,
118          detail::stream_traits<Device, Tr>::stream_tag
119        { };
120    BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr)
121private:
122    typedef typename
123            detail::stream_traits<
124                Device, Tr
125            >::stream_type                       stream_type;
126public:
127    stream() { }
128    BOOST_IOSTREAMS_FORWARD( stream, open_impl, Device,
129                             BOOST_IOSTREAMS_PUSH_PARAMS,
130                             BOOST_IOSTREAMS_PUSH_ARGS )
131    bool is_open() const { return this->member.is_open(); }
132    void close() { this->member.close(); }
133    bool auto_close() const { return this->member.auto_close(); }
134    void set_auto_close(bool close) { this->member.set_auto_close(close); }
135    bool strict_sync() { return this->member.strict_sync(); }
136    Device& operator*() { return *this->member; }
137    Device* operator->() { return &*this->member; }
138    Device* component() { return this->member.component(); }
139private:
140    void open_impl(const Device& dev BOOST_IOSTREAMS_PUSH_PARAMS()) // For forwarding.
141    { 
142        this->clear(); 
143        this->member.open(dev BOOST_IOSTREAMS_PUSH_ARGS()); 
144    }
145};
146
147} } // End namespaces iostreams, boost.
148
149#endif // #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION
150
151#endif // #ifndef BOOST_IOSTREAMS_stream_HPP_INCLUDED