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_BUFFER_HPP_INCLUDED
9 #define BOOST_IOSTREAMS_STREAM_BUFFER_HPP_INCLUDED
10 
11 #if defined(_MSC_VER)
12 # pragma once
13 #endif
14 
15 #include <memory>            // allocator.
16 #include <boost/config.hpp>  // BOOST_DEDUCED_TYPENAME.
17 #include <boost/iostreams/detail/char_traits.hpp>
18 #include <boost/iostreams/detail/config/overload_resolution.hpp>
19 #include <boost/iostreams/detail/forward.hpp>
20 #include <boost/iostreams/detail/ios.hpp>  // failure, streamsize.
21 #include <boost/iostreams/detail/streambuf/direct_streambuf.hpp>
22 #include <boost/iostreams/detail/streambuf/indirect_streambuf.hpp>
23 #include <boost/iostreams/traits.hpp>
24 #include <boost/static_assert.hpp>
25 #include <boost/throw_exception.hpp>
26 #include <boost/type_traits/is_convertible.hpp>
27 
28 // Must come last.
29 #include <boost/iostreams/detail/config/disable_warnings.hpp>  // MSVC.
30 
31 namespace boost { namespace iostreams { namespace detail {
32 
33 template<typename T, typename Tr, typename Alloc, typename Mode>
34 struct stream_buffer_traits {
35     typedef typename
36             mpl::if_<
37                 is_convertible<
38                     BOOST_DEDUCED_TYPENAME category_of<T>::type,
39                     direct_tag
40                 >,
41                 direct_streambuf<T, Tr>,
42                 indirect_streambuf<T, Tr, Alloc, Mode>
43             >::type type;
44 };
45 
46 } } } // End namespaces detail, iostreams, boost
47 
48 #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION
49 # include <boost/iostreams/detail/broken_overload_resolution/stream_buffer.hpp>
50 #else
51 
52 namespace boost { namespace iostreams {
53 
54 template< typename T,
55           typename Tr =
56               BOOST_IOSTREAMS_CHAR_TRAITS(
57                   BOOST_DEDUCED_TYPENAME char_type_of<T>::type
58               ),
59           typename Alloc =
60               std::allocator<
61                   BOOST_DEDUCED_TYPENAME char_type_of<T>::type
62               >,
63           typename Mode = BOOST_DEDUCED_TYPENAME mode_of<T>::type >
64 class stream_buffer
65     : public detail::stream_buffer_traits<T, Tr, Alloc, Mode>::type
66 {
67 private:
68     BOOST_STATIC_ASSERT((
69         is_convertible<
70             BOOST_DEDUCED_TYPENAME iostreams::category_of<T>::type, Mode
71         >::value
72     ));
73     typedef typename
74             detail::stream_buffer_traits<
75                 T, Tr, Alloc, Mode
76             >::type                           base_type;
77 public:
78     typedef typename char_type_of<T>::type    char_type;
79     struct category
80         : Mode,
81           closable_tag,
82           streambuf_tag
83         { };
84     BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr)
85 public:
stream_buffer()86     stream_buffer() { }
~stream_buffer()87     ~stream_buffer()
88     {
89         try {
90             if (this->is_open() && this->auto_close())
91                 this->close();
92         } catch (...) { }
93     }
BOOST_IOSTREAMS_FORWARD(stream_buffer,open_impl,T,BOOST_IOSTREAMS_PUSH_PARAMS,BOOST_IOSTREAMS_PUSH_ARGS)94     BOOST_IOSTREAMS_FORWARD( stream_buffer, open_impl, T,
95                              BOOST_IOSTREAMS_PUSH_PARAMS,
96                              BOOST_IOSTREAMS_PUSH_ARGS )
97     T& operator*() { return *this->component(); }
operator ->()98     T* operator->() { return this->component(); }
99 private:
open_impl(const T & t BOOST_IOSTREAMS_PUSH_PARAMS ())100     void open_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS())
101         {   // Used for forwarding.
102             if (this->is_open())
103                 boost::throw_exception(
104                     BOOST_IOSTREAMS_FAILURE("already open")
105                 );
106             base_type::open(t BOOST_IOSTREAMS_PUSH_ARGS());
107         }
108 };
109 
110 } } // End namespaces iostreams, boost.
111 
112 #endif // #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION
113 
114 #include <boost/iostreams/detail/config/enable_warnings.hpp>  // MSVC.
115 
116 #endif // #ifndef BOOST_IOSTREAMS_STREAM_BUFFER_HPP_INCLUDED
117