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_DETAIL_MODE_ADAPTER_HPP_INCLUDED
9 #define BOOST_IOSTREAMS_DETAIL_MODE_ADAPTER_HPP_INCLUDED
10
11 #if defined(_MSC_VER)
12 # pragma once
13 #endif
14
15 // Contains the definition of the class template mode_adapter, which allows
16 // a filter or device to function as if it has a different i/o mode than that
17 // deduced by the metafunction mode_of.
18
19 #include <boost/config.hpp> // BOOST_MSVC.
20 #include <boost/detail/workaround.hpp>
21 #include <boost/iostreams/categories.hpp>
22 #include <boost/iostreams/detail/ios.hpp> // openmode, seekdir, int types.
23 #include <boost/iostreams/traits.hpp>
24 #include <boost/iostreams/operations.hpp>
25 #include <boost/mpl/if.hpp>
26
27 namespace boost { namespace iostreams { namespace detail {
28
29 template<typename Mode, typename T>
30 class mode_adapter {
31 private:
32 struct empty_base { };
33 public:
34 typedef typename wrapped_type<T>::type component_type;
35 typedef typename char_type_of<T>::type char_type;
36 struct category
37 : Mode,
38 device_tag,
39 mpl::if_<is_filter<T>, filter_tag, device_tag>,
40 mpl::if_<is_filter<T>, multichar_tag, empty_base>,
41 closable_tag,
42 localizable_tag
43 { };
mode_adapter(const component_type & t)44 explicit mode_adapter(const component_type& t) : t_(t) { }
45
46 // Device member functions.
47
48 std::streamsize read(char_type* s, std::streamsize n);
49 std::streamsize write(const char_type* s, std::streamsize n);
50 std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
51 BOOST_IOS::openmode which =
52 BOOST_IOS::in | BOOST_IOS::out );
53 void close();
54 void close(BOOST_IOS::openmode which);
55
56 // Filter member functions.
57
58 template<typename Source>
read(Source & src,char_type * s,std::streamsize n)59 std::streamsize read(Source& src, char_type* s, std::streamsize n)
60 { return iostreams::read(t_, src, s, n); }
61
62 template<typename Sink>
write(Sink & snk,const char_type * s,std::streamsize n)63 std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
64 { return iostreams::write(t_, snk, s, n); }
65
66 template<typename Device>
seek(Device & dev,stream_offset off,BOOST_IOS::seekdir way)67 std::streampos seek(Device& dev, stream_offset off, BOOST_IOS::seekdir way)
68 { return iostreams::seek(t_, dev, off, way); }
69
70 template<typename Device>
seek(Device & dev,stream_offset off,BOOST_IOS::seekdir way,BOOST_IOS::openmode which)71 std::streampos seek( Device& dev, stream_offset off,
72 BOOST_IOS::seekdir way, BOOST_IOS::openmode which )
73 { return iostreams::seek(t_, dev, off, way, which); }
74
75 template<typename Device>
close(Device & dev)76 void close(Device& dev)
77 { detail::close_all(t_, dev); }
78
79 template<typename Device>
close(Device & dev,BOOST_IOS::openmode which)80 void close(Device& dev, BOOST_IOS::openmode which)
81 { iostreams::close(t_, dev, which); }
82
83 template<typename Locale>
imbue(const Locale & loc)84 void imbue(const Locale& loc)
85 { iostreams::imbue(t_, loc); }
86 private:
87 component_type t_;
88 };
89
90 //------------------Implementation of mode_adapter----------------------------//
91
92 template<typename Mode, typename T>
read(char_type * s,std::streamsize n)93 std::streamsize mode_adapter<Mode, T>::read
94 (char_type* s, std::streamsize n)
95 { return boost::iostreams::read(t_, s, n); }
96
97 template<typename Mode, typename T>
write(const char_type * s,std::streamsize n)98 std::streamsize mode_adapter<Mode, T>::write
99 (const char_type* s, std::streamsize n)
100 { return boost::iostreams::write(t_, s, n); }
101
102 template<typename Mode, typename T>
seek(stream_offset off,BOOST_IOS::seekdir way,BOOST_IOS::openmode which)103 std::streampos mode_adapter<Mode, T>::seek
104 (stream_offset off, BOOST_IOS::seekdir way, BOOST_IOS::openmode which)
105 { return boost::iostreams::seek(t_, off, way, which); }
106
107 template<typename Mode, typename T>
close()108 void mode_adapter<Mode, T>::close()
109 { detail::close_all(t_); }
110
111 template<typename Mode, typename T>
close(BOOST_IOS::openmode which)112 void mode_adapter<Mode, T>::close(BOOST_IOS::openmode which)
113 { iostreams::close(t_, which); }
114
115 } } } // End namespaces detail, iostreams, boost.
116
117 #endif // #ifndef BOOST_IOSTREAMS_DETAIL_MODE_ADAPTER_HPP_INCLUDED //-----//
118