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_CONCEPTS_HPP_INCLUDED
9#define BOOST_IOSTREAMS_CONCEPTS_HPP_INCLUDED
10
11#if defined(_MSC_VER) && (_MSC_VER >= 1020)
12# pragma once
13#endif
14
15#include <boost/config.hpp> // BOOST_MSVC
16#include <boost/detail/workaround.hpp>
17#include <boost/iostreams/categories.hpp>
18#include <boost/iostreams/detail/default_arg.hpp>
19#include <boost/iostreams/detail/ios.hpp> // openmode.
20#include <boost/iostreams/positioning.hpp>
21#include <boost/static_assert.hpp>
22#include <boost/type_traits/is_convertible.hpp>
23
24namespace boost { namespace iostreams {
25
26//--------------Definitions of helper templates for device concepts-----------//
27
28template<typename Mode, typename Ch = BOOST_IOSTREAMS_DEFAULT_ARG(char)>
29struct device {
30 typedef Ch char_type;
31 struct category
32 : Mode,
33 device_tag,
34 closable_tag,
35 localizable_tag
36 { };
37
38 void close()
39 {
40 using namespace detail;
41 BOOST_STATIC_ASSERT((!is_convertible<Mode, two_sequence>::value));
42 }
43
44 void close(BOOST_IOS::openmode)
45 {
46 using namespace detail;
47 BOOST_STATIC_ASSERT((is_convertible<Mode, two_sequence>::value));
48 }
49
50 template<typename Locale>
51 void imbue(const Locale&) { }
52};
53
54template<typename Mode, typename Ch = BOOST_IOSTREAMS_DEFAULT_ARG(wchar_t)>
55struct wdevice : device<Mode, Ch> { };
56
57typedef device<input> source;
58typedef wdevice<input> wsource;
59typedef device<output> sink;
60typedef wdevice<output> wsink;
61
62//--------------Definitions of helper templates for simple filter concepts----//
63
64template<typename Mode, typename Ch = BOOST_IOSTREAMS_DEFAULT_ARG(char)>
65struct filter {
66 typedef Ch char_type;
67 struct category
68 : Mode,
69 filter_tag,
70 closable_tag,
71 localizable_tag
72 { };
73
74 template<typename Device>
75 void close(Device&)
76 {
77 using namespace detail;
78 BOOST_STATIC_ASSERT((!is_convertible<Mode, two_sequence>::value));
79 BOOST_STATIC_ASSERT((!is_convertible<Mode, dual_use>::value));
80 }
81
82 template<typename Device>
83 void close(Device&, BOOST_IOS::openmode)
84 {
85 using namespace detail;
86 BOOST_STATIC_ASSERT(
87 (is_convertible<Mode, two_sequence>::value) ||
88 (is_convertible<Mode, dual_use>::value)
89 );
90 }
91
92 template<typename Locale>
93 void imbue(const Locale&) { }
94};
95
96template<typename Mode, typename Ch = BOOST_IOSTREAMS_DEFAULT_ARG(wchar_t)>
97struct wfilter : filter<Mode, Ch> { };
98
99typedef filter<input> input_filter;
100typedef wfilter<input> input_wfilter;
101typedef filter<output> output_filter;
102typedef wfilter<output> output_wfilter;
103typedef filter<seekable> seekable_filter;
104typedef wfilter<seekable> seekable_wfilter;
105typedef filter<dual_use> dual_use_filter;
106typedef wfilter<dual_use> dual_use_wfilter;
107
108//------Definitions of helper templates for multi-character filter cncepts----//
109
110template<typename Mode, typename Ch = char>
111struct multichar_filter : filter<Mode, Ch> {
112 struct category : filter<Mode, Ch>::category, multichar_tag { };
113};
114
115template<typename Mode, typename Ch = wchar_t>
116struct multichar_wfilter : multichar_filter<Mode, Ch> { };
117
118typedef multichar_filter<input> multichar_input_filter;
119typedef multichar_wfilter<input> multichar_input_wfilter;
120typedef multichar_filter<output> multichar_output_filter;
121typedef multichar_wfilter<output> multichar_output_wfilter;
122typedef multichar_filter<dual_use> multichar_dual_use_filter;
123typedef multichar_wfilter<dual_use> multichar_dual_use_wfilter;
124
125//----------------------------------------------------------------------------//
126
127} } // End namespaces iostreams, boost.
128
129#endif // #ifndef BOOST_IOSTREAMS_CONCEPTS_HPP_INCLUDED
130

source code of boost/boost/iostreams/concepts.hpp