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<td class="headerValue" width="20%">2008-08-14</td>
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<td class="headerValue" width="20%">3</td>
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<td><pre class="source">
<span class="lineNum"> 1 </span> : // Position types -*- C++ -*-
<span class="lineNum"> 2 </span> :
<span class="lineNum"> 3 </span> : // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
<span class="lineNum"> 4 </span> : // 2006, 2007, 2008
<span class="lineNum"> 5 </span> : // Free Software Foundation, Inc.
<span class="lineNum"> 6 </span> : //
<span class="lineNum"> 7 </span> : // This file is part of the GNU ISO C++ Library. This library is free
<span class="lineNum"> 8 </span> : // software; you can redistribute it and/or modify it under the
<span class="lineNum"> 9 </span> : // terms of the GNU General Public License as published by the
<span class="lineNum"> 10 </span> : // Free Software Foundation; either version 2, or (at your option)
<span class="lineNum"> 11 </span> : // any later version.
<span class="lineNum"> 12 </span> :
<span class="lineNum"> 13 </span> : // This library is distributed in the hope that it will be useful,
<span class="lineNum"> 14 </span> : // but WITHOUT ANY WARRANTY; without even the implied warranty of
<span class="lineNum"> 15 </span> : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
<span class="lineNum"> 16 </span> : // GNU General Public License for more details.
<span class="lineNum"> 17 </span> :
<span class="lineNum"> 18 </span> : // You should have received a copy of the GNU General Public License along
<span class="lineNum"> 19 </span> : // with this library; see the file COPYING. If not, write to the Free
<span class="lineNum"> 20 </span> : // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
<span class="lineNum"> 21 </span> : // USA.
<span class="lineNum"> 22 </span> :
<span class="lineNum"> 23 </span> : // As a special exception, you may use this file as part of a free software
<span class="lineNum"> 24 </span> : // library without restriction. Specifically, if other files instantiate
<span class="lineNum"> 25 </span> : // templates or use macros or inline functions from this file, or you compile
<span class="lineNum"> 26 </span> : // this file and link it with other files to produce an executable, this
<span class="lineNum"> 27 </span> : // file does not by itself cause the resulting executable to be covered by
<span class="lineNum"> 28 </span> : // the GNU General Public License. This exception does not however
<span class="lineNum"> 29 </span> : // invalidate any other reasons why the executable file might be covered by
<span class="lineNum"> 30 </span> : // the GNU General Public License.
<span class="lineNum"> 31 </span> :
<span class="lineNum"> 32 </span> : /** @file postypes.h
<span class="lineNum"> 33 </span> : * This is an internal header file, included by other library headers.
<span class="lineNum"> 34 </span> : * You should not attempt to use it directly.
<span class="lineNum"> 35 </span> : */
<span class="lineNum"> 36 </span> :
<span class="lineNum"> 37 </span> : //
<span class="lineNum"> 38 </span> : // ISO C++ 14882: 27.4.1 - Types
<span class="lineNum"> 39 </span> : // ISO C++ 14882: 27.4.3 - Template class fpos
<span class="lineNum"> 40 </span> : //
<span class="lineNum"> 41 </span> :
<span class="lineNum"> 42 </span> : #ifndef _GLIBCXX_POSTYPES_H
<span class="lineNum"> 43 </span> : #define _GLIBCXX_POSTYPES_H 1
<span class="lineNum"> 44 </span> :
<span class="lineNum"> 45 </span> : #pragma GCC system_header
<span class="lineNum"> 46 </span> :
<span class="lineNum"> 47 </span> : #include <cwchar> // For mbstate_t
<span class="lineNum"> 48 </span> :
<span class="lineNum"> 49 </span> : #ifdef _GLIBCXX_HAVE_STDINT_H
<span class="lineNum"> 50 </span> : #include <stdint.h> // For int64_t
<span class="lineNum"> 51 </span> : #endif
<span class="lineNum"> 52 </span> :
<span class="lineNum"> 53 </span> : _GLIBCXX_BEGIN_NAMESPACE(std)
<span class="lineNum"> 54 </span> :
<span class="lineNum"> 55 </span> : // The types streamoff, streampos and wstreampos and the class
<span class="lineNum"> 56 </span> : // template fpos<> are described in clauses 21.1.2, 21.1.3, 27.1.2,
<span class="lineNum"> 57 </span> : // 27.2, 27.4.1, 27.4.3 and D.6. Despite all this verbiage, the
<span class="lineNum"> 58 </span> : // behaviour of these types is mostly implementation defined or
<span class="lineNum"> 59 </span> : // unspecified. The behaviour in this implementation is as noted
<span class="lineNum"> 60 </span> : // below.
<span class="lineNum"> 61 </span> :
<span class="lineNum"> 62 </span> : /**
<span class="lineNum"> 63 </span> : * @brief Type used by fpos, char_traits<char>, and char_traits<wchar_t>.
<span class="lineNum"> 64 </span> : *
<span class="lineNum"> 65 </span> : * In clauses 21.1.3.1 and 27.4.1 streamoff is described as an
<span class="lineNum"> 66 </span> : * implementation defined type.
<span class="lineNum"> 67 </span> : * Note: In versions of GCC up to and including GCC 3.3, streamoff
<span class="lineNum"> 68 </span> : * was typedef long.
<span class="lineNum"> 69 </span> : */
<span class="lineNum"> 70 </span> : #ifdef _GLIBCXX_HAVE_INT64_T
<span class="lineNum"> 71 </span> : typedef int64_t streamoff;
<span class="lineNum"> 72 </span> : #else
<span class="lineNum"> 73 </span> : typedef long long streamoff;
<span class="lineNum"> 74 </span> : #endif
<span class="lineNum"> 75 </span> :
<span class="lineNum"> 76 </span> : /// Integral type for I/O operation counts and buffer sizes.
<span class="lineNum"> 77 </span> : typedef ptrdiff_t streamsize; // Signed integral type
<span class="lineNum"> 78 </span> :
<span class="lineNum"> 79 </span> : /**
<span class="lineNum"> 80 </span> : * @brief Class representing stream positions.
<span class="lineNum"> 81 </span> : *
<span class="lineNum"> 82 </span> : * The standard places no requirements upon the template parameter StateT.
<span class="lineNum"> 83 </span> : * In this implementation StateT must be DefaultConstructible,
<span class="lineNum"> 84 </span> : * CopyConstructible and Assignable. The standard only requires that fpos
<span class="lineNum"> 85 </span> : * should contain a member of type StateT. In this implementation it also
<span class="lineNum"> 86 </span> : * contains an offset stored as a signed integer.
<span class="lineNum"> 87 </span> : *
<span class="lineNum"> 88 </span> : * @param StateT Type passed to and returned from state().
<span class="lineNum"> 89 </span> : */
<span class="lineNum"> 90 </span> : template<typename _StateT>
<span class="lineNum"> 91 </span> : class fpos
<span class="lineNum"> 92 </span> : {
<span class="lineNum"> 93 </span> : private:
<span class="lineNum"> 94 </span> : streamoff _M_off;
<span class="lineNum"> 95 </span> : _StateT _M_state;
<span class="lineNum"> 96 </span> :
<span class="lineNum"> 97 </span> : public:
<span class="lineNum"> 98 </span> : // The standard doesn't require that fpos objects can be default
<span class="lineNum"> 99 </span> : // constructed. This implementation provides a default
<span class="lineNum"> 100 </span> : // constructor that initializes the offset to 0 and default
<span class="lineNum"> 101 </span> : // constructs the state.
<span class="lineNum"> 102 </span> : fpos()
<span class="lineNum"> 103 </span> : : _M_off(0), _M_state() { }
<span class="lineNum"> 104 </span> :
<span class="lineNum"> 105 </span> : // The standard requires that fpos objects can be constructed
<span class="lineNum"> 106 </span> : // from streamoff objects using the constructor syntax, and
<span class="lineNum"> 107 </span> : // fails to give any meaningful semantics. In this
<span class="lineNum"> 108 </span> : // implementation implicit conversion is also allowed, and this
<span class="lineNum"> 109 </span> : // constructor stores the streamoff as the offset and default
<span class="lineNum"> 110 </span> : // constructs the state.
<span class="lineNum"> 111 </span> : /// Construct position from offset.
<span class="lineNum"> 112 </span><span class="lineNoCov"> 0 : fpos(streamoff __off)</span>
<span class="lineNum"> 113 </span><span class="lineNoCov"> 0 : : _M_off(__off), _M_state() { }</span>
<span class="lineNum"> 114 </span> :
<span class="lineNum"> 115 </span> : /// Convert to streamoff.
<span class="lineNum"> 116 </span><span class="lineNoCov"> 0 : operator streamoff() const { return _M_off; }</span>
<span class="lineNum"> 117 </span> :
<span class="lineNum"> 118 </span> : /// Remember the value of @a st.
<span class="lineNum"> 119 </span> : void
<span class="lineNum"> 120 </span> : state(_StateT __st)
<span class="lineNum"> 121 </span> : { _M_state = __st; }
<span class="lineNum"> 122 </span> :
<span class="lineNum"> 123 </span> : /// Return the last set value of @a st.
<span class="lineNum"> 124 </span> : _StateT
<span class="lineNum"> 125 </span> : state() const
<span class="lineNum"> 126 </span> : { return _M_state; }
<span class="lineNum"> 127 </span> :
<span class="lineNum"> 128 </span> : // The standard requires that this operator must be defined, but
<span class="lineNum"> 129 </span> : // gives no semantics. In this implementation it just adds its
<span class="lineNum"> 130 </span> : // argument to the stored offset and returns *this.
<span class="lineNum"> 131 </span> : /// Add offset to this position.
<span class="lineNum"> 132 </span> : fpos&
<span class="lineNum"> 133 </span> : operator+=(streamoff __off)
<span class="lineNum"> 134 </span> : {
<span class="lineNum"> 135 </span> : _M_off += __off;
<span class="lineNum"> 136 </span> : return *this;
<span class="lineNum"> 137 </span> : }
<span class="lineNum"> 138 </span> :
<span class="lineNum"> 139 </span> : // The standard requires that this operator must be defined, but
<span class="lineNum"> 140 </span> : // gives no semantics. In this implementation it just subtracts
<span class="lineNum"> 141 </span> : // its argument from the stored offset and returns *this.
<span class="lineNum"> 142 </span> : /// Subtract offset from this position.
<span class="lineNum"> 143 </span> : fpos&
<span class="lineNum"> 144 </span> : operator-=(streamoff __off)
<span class="lineNum"> 145 </span> : {
<span class="lineNum"> 146 </span> : _M_off -= __off;
<span class="lineNum"> 147 </span> : return *this;
<span class="lineNum"> 148 </span> : }
<span class="lineNum"> 149 </span> :
<span class="lineNum"> 150 </span> : // The standard requires that this operator must be defined, but
<span class="lineNum"> 151 </span> : // defines its semantics only in terms of operator-. In this
<span class="lineNum"> 152 </span> : // implementation it constructs a copy of *this, adds the
<span class="lineNum"> 153 </span> : // argument to that copy using operator+= and then returns the
<span class="lineNum"> 154 </span> : // copy.
<span class="lineNum"> 155 </span> : /// Add position and offset.
<span class="lineNum"> 156 </span> : fpos
<span class="lineNum"> 157 </span> : operator+(streamoff __off) const
<span class="lineNum"> 158 </span> : {
<span class="lineNum"> 159 </span> : fpos __pos(*this);
<span class="lineNum"> 160 </span> : __pos += __off;
<span class="lineNum"> 161 </span> : return __pos;
<span class="lineNum"> 162 </span> : }
<span class="lineNum"> 163 </span> :
<span class="lineNum"> 164 </span> : // The standard requires that this operator must be defined, but
<span class="lineNum"> 165 </span> : // defines its semantics only in terms of operator+. In this
<span class="lineNum"> 166 </span> : // implementation it constructs a copy of *this, subtracts the
<span class="lineNum"> 167 </span> : // argument from that copy using operator-= and then returns the
<span class="lineNum"> 168 </span> : // copy.
<span class="lineNum"> 169 </span> : /// Subtract offset from position.
<span class="lineNum"> 170 </span> : fpos
<span class="lineNum"> 171 </span> : operator-(streamoff __off) const
<span class="lineNum"> 172 </span> : {
<span class="lineNum"> 173 </span> : fpos __pos(*this);
<span class="lineNum"> 174 </span> : __pos -= __off;
<span class="lineNum"> 175 </span> : return __pos;
<span class="lineNum"> 176 </span> : }
<span class="lineNum"> 177 </span> :
<span class="lineNum"> 178 </span> : // The standard requires that this operator must be defined, but
<span class="lineNum"> 179 </span> : // defines its semantics only in terms of operator+. In this
<span class="lineNum"> 180 </span> : // implementation it returns the difference between the offset
<span class="lineNum"> 181 </span> : // stored in *this and in the argument.
<span class="lineNum"> 182 </span> : /// Subtract position to return offset.
<span class="lineNum"> 183 </span> : streamoff
<span class="lineNum"> 184 </span> : operator-(const fpos& __other) const
<span class="lineNum"> 185 </span> : { return _M_off - __other._M_off; }
<span class="lineNum"> 186 </span> : };
<span class="lineNum"> 187 </span> :
<span class="lineNum"> 188 </span> : // The standard only requires that operator== must be an
<span class="lineNum"> 189 </span> : // equivalence relation. In this implementation two fpos<StateT>
<span class="lineNum"> 190 </span> : // objects belong to the same equivalence class if the contained
<span class="lineNum"> 191 </span> : // offsets compare equal.
<span class="lineNum"> 192 </span> : /// Test if equivalent to another position.
<span class="lineNum"> 193 </span> : template<typename _StateT>
<span class="lineNum"> 194 </span> : inline bool
<span class="lineNum"> 195 </span> : operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
<span class="lineNum"> 196 </span> : { return streamoff(__lhs) == streamoff(__rhs); }
<span class="lineNum"> 197 </span> :
<span class="lineNum"> 198 </span> : template<typename _StateT>
<span class="lineNum"> 199 </span> : inline bool
<span class="lineNum"> 200 </span> : operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
<span class="lineNum"> 201 </span> : { return streamoff(__lhs) != streamoff(__rhs); }
<span class="lineNum"> 202 </span> :
<span class="lineNum"> 203 </span> : // Clauses 21.1.3.1 and 21.1.3.2 describe streampos and wstreampos
<span class="lineNum"> 204 </span> : // as implementation defined types, but clause 27.2 requires that
<span class="lineNum"> 205 </span> : // they must both be typedefs for fpos<mbstate_t>
<span class="lineNum"> 206 </span> : /// File position for char streams.
<span class="lineNum"> 207 </span> : typedef fpos<mbstate_t> streampos;
<span class="lineNum"> 208 </span> : /// File position for wchar_t streams.
<span class="lineNum"> 209 </span> : typedef fpos<mbstate_t> wstreampos;
<span class="lineNum"> 210 </span> :
<span class="lineNum"> 211 </span> : _GLIBCXX_END_NAMESPACE
<span class="lineNum"> 212 </span> :
<span class="lineNum"> 213 </span> : #endif
</pre>
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