// (C) Copyright Jonathan Turkanis 2003.

 // 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_STREAM_HPP_INCLUDED

 #define BOOST_IOSTREAMS_STREAM_HPP_INCLUDED

 #if defined(_MSC_VER) && (_MSC_VER >= 1020)

 # pragma once

 #endif

 #include <boost/iostreams/constants.hpp>

 #include <boost/iostreams/detail/char_traits.hpp>

 #include <boost/iostreams/detail/config/overload_resolution.hpp>

 #include <boost/iostreams/detail/forward.hpp>

 #include <boost/iostreams/detail/iostream.hpp>  // standard streams.

 #include <boost/iostreams/detail/select.hpp>

 #include <boost/iostreams/stream_buffer.hpp>

 #include <boost/mpl/and.hpp>

 #include <boost/type_traits/is_convertible.hpp>

 namespace boost { namespace iostreams { namespace detail {

 template<typename Device, typename Tr>

 struct stream_traits {

     typedef typename char_type_of<Device>::type                char_type;

     typedef Tr                                                 traits_type;

     typedef typename category_of<Device>::type                 mode;

     typedef typename

             iostreams::select< // Dismbiguation required for Tru64.

                 mpl::and_<

                     is_convertible<mode, input>,

                     is_convertible<mode, output>

                 >,

                 BOOST_IOSTREAMS_BASIC_IOSTREAM(char_type, traits_type),

                 is_convertible<mode, input>,

                 BOOST_IOSTREAMS_BASIC_ISTREAM(char_type, traits_type),

                 else_,

                 BOOST_IOSTREAMS_BASIC_OSTREAM(char_type, traits_type)

             >::type type;

 };

 // By encapsulating initialization in a base, we can define the macro

 // BOOST_IOSTREAMS_DEFINE_FORWARDING_FUNCTIONS to generate constuctors

 // without base member initializer lists.

 template< typename Device,

           typename Tr =

               BOOST_IOSTREAMS_CHAR_TRAITS(

                   BOOST_DEDUCED_TYPENAME char_type_of<Device>::type

               ),

           typename Alloc =

               std::allocator<

                   BOOST_DEDUCED_TYPENAME char_type_of<Device>::type

               >,

           typename Base = // VC6 Workaround.

               BOOST_DEDUCED_TYPENAME

               detail::stream_traits<Device, Tr>::type >

 class stream_base

     : protected base_from_member< stream_buffer<Device, Tr, Alloc> >,

       public Base

 {

 private:

     typedef base_from_member< stream_buffer<Device, Tr, Alloc> > pbase_type;

     typedef typename stream_traits<Device, Tr>::type         stream_type;

 protected:

     using pbase_type::member; // Avoid warning about 'this' in initializer list.

 public:

     stream_base() : pbase_type(), stream_type(&member) { }

 };

 } } } // End namespaces detail, iostreams, boost.

 #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION

 # include <boost/iostreams/detail/broken_overload_resolution/stream.hpp>

 #else

 namespace boost { namespace iostreams {

 //

 // Template name: stream.

 // Description: A iostream which reads from and writes to an instance of a

 //      designated device type.

 // Template paramters:

 //      Device - A device type.

 //      Alloc - The allocator type.

 //

 template< typename Device,

           typename Tr =

               BOOST_IOSTREAMS_CHAR_TRAITS(

                   BOOST_DEDUCED_TYPENAME char_type_of<Device>::type

               ),

           typename Alloc =

               std::allocator<

                   BOOST_DEDUCED_TYPENAME char_type_of<Device>::type

               > >

 struct stream : detail::stream_base<Device, Tr, Alloc> {

 public:

     typedef typename char_type_of<Device>::type  char_type;

     BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr)

 private:

     typedef typename

             detail::stream_traits<

                 Device, Tr

             >::type                              stream_type;

     typedef Device                               policy_type;

 public:

     stream() { }

     BOOST_IOSTREAMS_FORWARD( stream, open_impl, Device,

                              BOOST_IOSTREAMS_PUSH_PARAMS,

                              BOOST_IOSTREAMS_PUSH_ARGS )

     bool is_open() const { return this->member.is_open(); }

     void close() { this->member.close(); }

     bool auto_close() const { return this->member.auto_close(); }

     void set_auto_close(bool close) { this->member.set_auto_close(close); }

     bool strict_sync() { return this->member.strict_sync(); }

     Device& operator*() { return *this->member; }

     Device* operator->() { return &*this->member; }

     Device* component() { return this->member.component(); }

 private:

     void open_impl(const Device& dev BOOST_IOSTREAMS_PUSH_PARAMS()) // For forwarding.

     { 

         this->clear(); 

         this->member.open(dev BOOST_IOSTREAMS_PUSH_ARGS()); 

     }

 };

 } } // End namespaces iostreams, boost.

 #endif // #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION

 #endif // #ifndef BOOST_IOSTREAMS_stream_HPP_INCLUDED