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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_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: | |
86 | stream_buffer() { } | |
87 | ~stream_buffer() | |
88 | { | |
89 | try { | |
90 | if (this->is_open() && this->auto_close()) | |
91 | this->close(); | |
92 | } catch (...) { } | |
93 | } | |
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(); } | |
98 | T* operator->() { return this->component(); } | |
99 | private: | |
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 |