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_WRITE_HPP_INCLUDED
9#define BOOST_IOSTREAMS_WRITE_HPP_INCLUDED
10
11#if defined(_MSC_VER) && (_MSC_VER >= 1020)
12# pragma once
13#endif
14
15#include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC.
16#include <boost/detail/workaround.hpp>
17#include <boost/iostreams/categories.hpp>
18#include <boost/iostreams/detail/char_traits.hpp>
19#include <boost/iostreams/detail/dispatch.hpp>
20#include <boost/iostreams/detail/ios.hpp> // streamsize.
21#include <boost/iostreams/detail/streambuf.hpp>
22#include <boost/iostreams/detail/wrap_unwrap.hpp>
23#include <boost/iostreams/operations_fwd.hpp>
24#include <boost/iostreams/traits.hpp>
25#include <boost/mpl/if.hpp>
26
27// Must come last.
28#include <boost/iostreams/detail/config/disable_warnings.hpp>
29
30#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-----------------------------------//
31# include <boost/iostreams/detail/vc6/write.hpp>
32#else // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //--------------------------//
33
34namespace boost { namespace iostreams {
35
36namespace detail {
37
38template<typename T>
39struct write_device_impl;
40
41template<typename T>
42struct write_filter_impl;
43
44} // End namespace detail.
45
46template<typename T>
47bool put(T& t, typename char_type_of<T>::type c)
48{ return detail::write_device_impl<T>::put(detail::unwrap(t), c); }
49
50template<typename T>
51inline std::streamsize write
52 (T& t, const typename char_type_of<T>::type* s, std::streamsize n)
53{ return detail::write_device_impl<T>::write(detail::unwrap(t), s, n); }
54
55template<typename T, typename Sink>
56inline std::streamsize
57write( T& t, Sink& snk, const typename char_type_of<T>::type* s,
58 std::streamsize n )
59{ return detail::write_filter_impl<T>::write(detail::unwrap(t), snk, s, n); }
60
61namespace detail {
62
63//------------------Definition of write_device_impl---------------------------//
64
65template<typename T>
66struct write_device_impl
67 : mpl::if_<
68 is_custom<T>,
69 operations<T>,
70 write_device_impl<
71 BOOST_DEDUCED_TYPENAME
72 dispatch<
73 T, ostream_tag, streambuf_tag, output
74 >::type
75 >
76 >::type
77 { };
78
79template<>
80struct write_device_impl<ostream_tag> {
81 template<typename T>
82 static bool put(T& t, typename char_type_of<T>::type c)
83 {
84 typedef typename char_type_of<T>::type char_type;
85 typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type) traits_type;
86 return !traits_type::eq_int_type( t.rdbuf()->sputc(c),
87 traits_type::eof() );
88 }
89
90 template<typename T>
91 static std::streamsize write
92 (T& t, const typename char_type_of<T>::type* s, std::streamsize n)
93 { return t.rdbuf()->sputn(s, n); }
94};
95
96template<>
97struct write_device_impl<streambuf_tag> {
98 template<typename T>
99 static bool put(T& t, typename char_type_of<T>::type c)
100 {
101 typedef typename char_type_of<T>::type char_type;
102 typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type) traits_type;
103 return !traits_type::eq_int_type(t.sputc(c), traits_type::eof());
104 }
105
106 template<typename T>
107 static std::streamsize write
108 (T& t, const typename char_type_of<T>::type* s, std::streamsize n)
109 { return t.sputn(s, n); }
110};
111
112template<>
113struct write_device_impl<output> {
114 template<typename T>
115 static bool put(T& t, typename char_type_of<T>::type c)
116 { return t.write(&c, 1) == 1; }
117
118 template<typename T>
119 static std::streamsize
120 write(T& t, const typename char_type_of<T>::type* s, std::streamsize n)
121 { return t.write(s, n); }
122};
123
124//------------------Definition of write_filter_impl---------------------------//
125
126template<typename T>
127struct write_filter_impl
128 : mpl::if_<
129 is_custom<T>,
130 operations<T>,
131 write_filter_impl<
132 BOOST_DEDUCED_TYPENAME
133 dispatch<
134 T, multichar_tag, any_tag
135 >::type
136 >
137 >::type
138 { };
139
140template<>
141struct write_filter_impl<multichar_tag> {
142 template<typename T, typename Sink>
143 static std::streamsize
144 write( T& t, Sink& snk, const typename char_type_of<T>::type* s,
145 std::streamsize n )
146 { return t.write(snk, s, n); }
147};
148
149template<>
150struct write_filter_impl<any_tag> {
151 template<typename T, typename Sink>
152 static std::streamsize
153 write( T& t, Sink& snk, const typename char_type_of<T>::type* s,
154 std::streamsize n )
155 {
156 for (std::streamsize off = 0; off < n; ++off)
157 if (!t.put(snk, s[off]))
158 return off;
159 return n;
160 }
161};
162
163} // End namespace detail.
164
165} } // End namespaces iostreams, boost.
166
167#endif // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-------------------------//
168
169#include <boost/iostreams/detail/config/enable_warnings.hpp>
170
171#endif // #ifndef BOOST_IOSTREAMS_WRITE_HPP_INCLUDED
172

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