1 // (C) Copyright Jonathan Turkanis 2003.

     2 // Distributed under the Boost Software License, Version 1.0. (See accompanying

     3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)

     4 

     5 // See http://www.boost.org/libs/iostreams for documentation.

     6 

     7 #ifndef BOOST_IOSTREAMS_STREAM_HPP_INCLUDED

     8 #define BOOST_IOSTREAMS_STREAM_HPP_INCLUDED

     9 

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

    11 # pragma once

    12 #endif

    13 

    14 #include <boost/iostreams/constants.hpp>

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

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

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

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

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

    20 #include <boost/iostreams/stream_buffer.hpp>

    21 #include <boost/mpl/and.hpp>

    22 #include <boost/type_traits/is_convertible.hpp>

    23 

    24 namespace boost { namespace iostreams { namespace detail {

    25 

    26 template<typename Device, typename Tr>

    27 struct stream_traits {

    28     typedef typename char_type_of<Device>::type                char_type;

    29     typedef Tr                                                 traits_type;

    30     typedef typename category_of<Device>::type                 mode;

    31     typedef typename

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

    33                 mpl::and_<

    34                     is_convertible<mode, input>,

    35                     is_convertible<mode, output>

    36                 >,

    37                 BOOST_IOSTREAMS_BASIC_IOSTREAM(char_type, traits_type),

    38                 is_convertible<mode, input>,

    39                 BOOST_IOSTREAMS_BASIC_ISTREAM(char_type, traits_type),

    40                 else_,

    41                 BOOST_IOSTREAMS_BASIC_OSTREAM(char_type, traits_type)

    42             >::type type;

    43 };

    44 

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

    46 // BOOST_IOSTREAMS_DEFINE_FORWARDING_FUNCTIONS to generate constuctors

    47 // without base member initializer lists.

    48 template< typename Device,

    49           typename Tr =

    50               BOOST_IOSTREAMS_CHAR_TRAITS(

    51                   BOOST_DEDUCED_TYPENAME char_type_of<Device>::type

    52               ),

    53           typename Alloc =

    54               std::allocator<

    55                   BOOST_DEDUCED_TYPENAME char_type_of<Device>::type

    56               >,

    57           typename Base = // VC6 Workaround.

    58               BOOST_DEDUCED_TYPENAME

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

    60 class stream_base

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

    62       public Base

    63 {

    64 private:

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

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

    67 protected:

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

    69 public:

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

    71 };

    72 

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

    74 

    75 #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION

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

    77 #else

    78 

    79 namespace boost { namespace iostreams {

    80 

    81 //

    82 // Template name: stream.

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

    84 //      designated device type.

    85 // Template paramters:

    86 //      Device - A device type.

    87 //      Alloc - The allocator type.

    88 //

    89 template< typename Device,

    90           typename Tr =

    91               BOOST_IOSTREAMS_CHAR_TRAITS(

    92                   BOOST_DEDUCED_TYPENAME char_type_of<Device>::type

    93               ),

    94           typename Alloc =

    95               std::allocator<

    96                   BOOST_DEDUCED_TYPENAME char_type_of<Device>::type

    97               > >

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

    99 public:

   100     typedef typename char_type_of<Device>::type  char_type;

   101     BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr)

   102 private:

   103     typedef typename

   104             detail::stream_traits<

   105                 Device, Tr

   106             >::type                              stream_type;

   107     typedef Device                               policy_type;

   108 public:

   109     stream() { }

   110     BOOST_IOSTREAMS_FORWARD( stream, open_impl, Device,

   111                              BOOST_IOSTREAMS_PUSH_PARAMS,

   112                              BOOST_IOSTREAMS_PUSH_ARGS )

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

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

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

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

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

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

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

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

   121 private:

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

   123     { 

   124         this->clear(); 

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

   126     }

   127 };

   128 

   129 } } // End namespaces iostreams, boost.

   130 

   131 #endif // #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION

   132 

   133 #endif // #ifndef BOOST_IOSTREAMS_stream_HPP_INCLUDED