1 |
742 |
jeremybenn |
// Position types -*- C++ -*-
|
2 |
|
|
|
3 |
|
|
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
|
4 |
|
|
// 2006, 2007, 2008, 2009, 2010
|
5 |
|
|
// Free Software Foundation, Inc.
|
6 |
|
|
//
|
7 |
|
|
// This file is part of the GNU ISO C++ Library. This library is free
|
8 |
|
|
// software; you can redistribute it and/or modify it under the
|
9 |
|
|
// terms of the GNU General Public License as published by the
|
10 |
|
|
// Free Software Foundation; either version 3, or (at your option)
|
11 |
|
|
// any later version.
|
12 |
|
|
|
13 |
|
|
// This library is distributed in the hope that it will be useful,
|
14 |
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
15 |
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
16 |
|
|
// GNU General Public License for more details.
|
17 |
|
|
|
18 |
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
19 |
|
|
// permissions described in the GCC Runtime Library Exception, version
|
20 |
|
|
// 3.1, as published by the Free Software Foundation.
|
21 |
|
|
|
22 |
|
|
// You should have received a copy of the GNU General Public License and
|
23 |
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
24 |
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
25 |
|
|
// <http://www.gnu.org/licenses/>.
|
26 |
|
|
|
27 |
|
|
/** @file bits/postypes.h
|
28 |
|
|
* This is an internal header file, included by other library headers.
|
29 |
|
|
* Do not attempt to use it directly. @headername{iosfwd}
|
30 |
|
|
*/
|
31 |
|
|
|
32 |
|
|
//
|
33 |
|
|
// ISO C++ 14882: 27.4.1 - Types
|
34 |
|
|
// ISO C++ 14882: 27.4.3 - Template class fpos
|
35 |
|
|
//
|
36 |
|
|
|
37 |
|
|
#ifndef _GLIBCXX_POSTYPES_H
|
38 |
|
|
#define _GLIBCXX_POSTYPES_H 1
|
39 |
|
|
|
40 |
|
|
#pragma GCC system_header
|
41 |
|
|
|
42 |
|
|
#include <cwchar> // For mbstate_t
|
43 |
|
|
|
44 |
|
|
// XXX If <stdint.h> is really needed, make sure to define the macros
|
45 |
|
|
// before including it, in order not to break <tr1/cstdint> (and <cstdint>
|
46 |
|
|
// in C++0x). Reconsider all this as soon as possible...
|
47 |
|
|
#if (defined(_GLIBCXX_HAVE_INT64_T) && !defined(_GLIBCXX_HAVE_INT64_T_LONG) \
|
48 |
|
|
&& !defined(_GLIBCXX_HAVE_INT64_T_LONG_LONG))
|
49 |
|
|
|
50 |
|
|
#ifndef __STDC_LIMIT_MACROS
|
51 |
|
|
# define _UNDEF__STDC_LIMIT_MACROS
|
52 |
|
|
# define __STDC_LIMIT_MACROS
|
53 |
|
|
#endif
|
54 |
|
|
#ifndef __STDC_CONSTANT_MACROS
|
55 |
|
|
# define _UNDEF__STDC_CONSTANT_MACROS
|
56 |
|
|
# define __STDC_CONSTANT_MACROS
|
57 |
|
|
#endif
|
58 |
|
|
#include <stdint.h> // For int64_t
|
59 |
|
|
#ifdef _UNDEF__STDC_LIMIT_MACROS
|
60 |
|
|
# undef __STDC_LIMIT_MACROS
|
61 |
|
|
# undef _UNDEF__STDC_LIMIT_MACROS
|
62 |
|
|
#endif
|
63 |
|
|
#ifdef _UNDEF__STDC_CONSTANT_MACROS
|
64 |
|
|
# undef __STDC_CONSTANT_MACROS
|
65 |
|
|
# undef _UNDEF__STDC_CONSTANT_MACROS
|
66 |
|
|
#endif
|
67 |
|
|
|
68 |
|
|
#endif
|
69 |
|
|
|
70 |
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
71 |
|
|
{
|
72 |
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
73 |
|
|
|
74 |
|
|
// The types streamoff, streampos and wstreampos and the class
|
75 |
|
|
// template fpos<> are described in clauses 21.1.2, 21.1.3, 27.1.2,
|
76 |
|
|
// 27.2, 27.4.1, 27.4.3 and D.6. Despite all this verbiage, the
|
77 |
|
|
// behaviour of these types is mostly implementation defined or
|
78 |
|
|
// unspecified. The behaviour in this implementation is as noted
|
79 |
|
|
// below.
|
80 |
|
|
|
81 |
|
|
/**
|
82 |
|
|
* @brief Type used by fpos, char_traits<char>, and char_traits<wchar_t>.
|
83 |
|
|
*
|
84 |
|
|
* In clauses 21.1.3.1 and 27.4.1 streamoff is described as an
|
85 |
|
|
* implementation defined type.
|
86 |
|
|
* Note: In versions of GCC up to and including GCC 3.3, streamoff
|
87 |
|
|
* was typedef long.
|
88 |
|
|
*/
|
89 |
|
|
#ifdef _GLIBCXX_HAVE_INT64_T_LONG
|
90 |
|
|
typedef long streamoff;
|
91 |
|
|
#elif defined(_GLIBCXX_HAVE_INT64_T_LONG_LONG)
|
92 |
|
|
typedef long long streamoff;
|
93 |
|
|
#elif defined(_GLIBCXX_HAVE_INT64_T)
|
94 |
|
|
typedef int64_t streamoff;
|
95 |
|
|
#else
|
96 |
|
|
typedef long long streamoff;
|
97 |
|
|
#endif
|
98 |
|
|
|
99 |
|
|
/// Integral type for I/O operation counts and buffer sizes.
|
100 |
|
|
typedef ptrdiff_t streamsize; // Signed integral type
|
101 |
|
|
|
102 |
|
|
/**
|
103 |
|
|
* @brief Class representing stream positions.
|
104 |
|
|
*
|
105 |
|
|
* The standard places no requirements upon the template parameter StateT.
|
106 |
|
|
* In this implementation StateT must be DefaultConstructible,
|
107 |
|
|
* CopyConstructible and Assignable. The standard only requires that fpos
|
108 |
|
|
* should contain a member of type StateT. In this implementation it also
|
109 |
|
|
* contains an offset stored as a signed integer.
|
110 |
|
|
*
|
111 |
|
|
* @param StateT Type passed to and returned from state().
|
112 |
|
|
*/
|
113 |
|
|
template<typename _StateT>
|
114 |
|
|
class fpos
|
115 |
|
|
{
|
116 |
|
|
private:
|
117 |
|
|
streamoff _M_off;
|
118 |
|
|
_StateT _M_state;
|
119 |
|
|
|
120 |
|
|
public:
|
121 |
|
|
// The standard doesn't require that fpos objects can be default
|
122 |
|
|
// constructed. This implementation provides a default
|
123 |
|
|
// constructor that initializes the offset to 0 and default
|
124 |
|
|
// constructs the state.
|
125 |
|
|
fpos()
|
126 |
|
|
: _M_off(0), _M_state() { }
|
127 |
|
|
|
128 |
|
|
// The standard requires that fpos objects can be constructed
|
129 |
|
|
// from streamoff objects using the constructor syntax, and
|
130 |
|
|
// fails to give any meaningful semantics. In this
|
131 |
|
|
// implementation implicit conversion is also allowed, and this
|
132 |
|
|
// constructor stores the streamoff as the offset and default
|
133 |
|
|
// constructs the state.
|
134 |
|
|
/// Construct position from offset.
|
135 |
|
|
fpos(streamoff __off)
|
136 |
|
|
: _M_off(__off), _M_state() { }
|
137 |
|
|
|
138 |
|
|
/// Convert to streamoff.
|
139 |
|
|
operator streamoff() const { return _M_off; }
|
140 |
|
|
|
141 |
|
|
/// Remember the value of @a st.
|
142 |
|
|
void
|
143 |
|
|
state(_StateT __st)
|
144 |
|
|
{ _M_state = __st; }
|
145 |
|
|
|
146 |
|
|
/// Return the last set value of @a st.
|
147 |
|
|
_StateT
|
148 |
|
|
state() const
|
149 |
|
|
{ return _M_state; }
|
150 |
|
|
|
151 |
|
|
// The standard requires that this operator must be defined, but
|
152 |
|
|
// gives no semantics. In this implementation it just adds its
|
153 |
|
|
// argument to the stored offset and returns *this.
|
154 |
|
|
/// Add offset to this position.
|
155 |
|
|
fpos&
|
156 |
|
|
operator+=(streamoff __off)
|
157 |
|
|
{
|
158 |
|
|
_M_off += __off;
|
159 |
|
|
return *this;
|
160 |
|
|
}
|
161 |
|
|
|
162 |
|
|
// The standard requires that this operator must be defined, but
|
163 |
|
|
// gives no semantics. In this implementation it just subtracts
|
164 |
|
|
// its argument from the stored offset and returns *this.
|
165 |
|
|
/// Subtract offset from this position.
|
166 |
|
|
fpos&
|
167 |
|
|
operator-=(streamoff __off)
|
168 |
|
|
{
|
169 |
|
|
_M_off -= __off;
|
170 |
|
|
return *this;
|
171 |
|
|
}
|
172 |
|
|
|
173 |
|
|
// The standard requires that this operator must be defined, but
|
174 |
|
|
// defines its semantics only in terms of operator-. In this
|
175 |
|
|
// implementation it constructs a copy of *this, adds the
|
176 |
|
|
// argument to that copy using operator+= and then returns the
|
177 |
|
|
// copy.
|
178 |
|
|
/// Add position and offset.
|
179 |
|
|
fpos
|
180 |
|
|
operator+(streamoff __off) const
|
181 |
|
|
{
|
182 |
|
|
fpos __pos(*this);
|
183 |
|
|
__pos += __off;
|
184 |
|
|
return __pos;
|
185 |
|
|
}
|
186 |
|
|
|
187 |
|
|
// The standard requires that this operator must be defined, but
|
188 |
|
|
// defines its semantics only in terms of operator+. In this
|
189 |
|
|
// implementation it constructs a copy of *this, subtracts the
|
190 |
|
|
// argument from that copy using operator-= and then returns the
|
191 |
|
|
// copy.
|
192 |
|
|
/// Subtract offset from position.
|
193 |
|
|
fpos
|
194 |
|
|
operator-(streamoff __off) const
|
195 |
|
|
{
|
196 |
|
|
fpos __pos(*this);
|
197 |
|
|
__pos -= __off;
|
198 |
|
|
return __pos;
|
199 |
|
|
}
|
200 |
|
|
|
201 |
|
|
// The standard requires that this operator must be defined, but
|
202 |
|
|
// defines its semantics only in terms of operator+. In this
|
203 |
|
|
// implementation it returns the difference between the offset
|
204 |
|
|
// stored in *this and in the argument.
|
205 |
|
|
/// Subtract position to return offset.
|
206 |
|
|
streamoff
|
207 |
|
|
operator-(const fpos& __other) const
|
208 |
|
|
{ return _M_off - __other._M_off; }
|
209 |
|
|
};
|
210 |
|
|
|
211 |
|
|
// The standard only requires that operator== must be an
|
212 |
|
|
// equivalence relation. In this implementation two fpos<StateT>
|
213 |
|
|
// objects belong to the same equivalence class if the contained
|
214 |
|
|
// offsets compare equal.
|
215 |
|
|
/// Test if equivalent to another position.
|
216 |
|
|
template<typename _StateT>
|
217 |
|
|
inline bool
|
218 |
|
|
operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
|
219 |
|
|
{ return streamoff(__lhs) == streamoff(__rhs); }
|
220 |
|
|
|
221 |
|
|
template<typename _StateT>
|
222 |
|
|
inline bool
|
223 |
|
|
operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
|
224 |
|
|
{ return streamoff(__lhs) != streamoff(__rhs); }
|
225 |
|
|
|
226 |
|
|
// Clauses 21.1.3.1 and 21.1.3.2 describe streampos and wstreampos
|
227 |
|
|
// as implementation defined types, but clause 27.2 requires that
|
228 |
|
|
// they must both be typedefs for fpos<mbstate_t>
|
229 |
|
|
/// File position for char streams.
|
230 |
|
|
typedef fpos<mbstate_t> streampos;
|
231 |
|
|
/// File position for wchar_t streams.
|
232 |
|
|
typedef fpos<mbstate_t> wstreampos;
|
233 |
|
|
|
234 |
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
235 |
|
|
/// File position for char16_t streams.
|
236 |
|
|
typedef fpos<mbstate_t> u16streampos;
|
237 |
|
|
/// File position for char32_t streams.
|
238 |
|
|
typedef fpos<mbstate_t> u32streampos;
|
239 |
|
|
#endif
|
240 |
|
|
|
241 |
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
242 |
|
|
} // namespace
|
243 |
|
|
|
244 |
|
|
#endif
|