// (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_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>

#include <boost/utility/base_from_member.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 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;

};



// 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>::stream_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>::stream_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;

    struct category 

        : mode_of<Device>::type,

          closable_tag,

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

        { };

    BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr)

private:

    typedef typename

            detail::stream_traits<

                Device, Tr

            >::stream_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

