LCOV - app.info - /tools/gcc-4.5/include/c++/4.5.2/bits/postypes.h

LCOV - code coverage report
| Current view: | directory - tools/gcc-4.5/include/c++/4.5.2/bits - postypes.h (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 3 | 3 | 100.0 %
| Date: | 2012-04-07 | Functions: | 2 | 2 | 100.0 %

           1                 : // Position types -*- C++ -*-
           2                 :
           3                 : // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
           4                 : // 2006, 2007, 2008, 2009
           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 postypes.h
          28                 :  *  This is an internal header file, included by other library headers.
          29                 :  *  You should not attempt to use it directly.
          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                 : _GLIBCXX_BEGIN_NAMESPACE(std)
          71                 :
          72                 :   // The types streamoff, streampos and wstreampos and the class
          73                 :   // template fpos<> are described in clauses 21.1.2, 21.1.3, 27.1.2,
          74                 :   // 27.2, 27.4.1, 27.4.3 and D.6. Despite all this verbiage, the
          75                 :   // behaviour of these types is mostly implementation defined or
          76                 :   // unspecified. The behaviour in this implementation is as noted
          77                 :   // below.
          78                 :
          79                 :   /**
          80                 :    *  @brief  Type used by fpos, char_traits<char>, and char_traits<wchar_t>.
          81                 :    *
          82                 :    *  In clauses 21.1.3.1 and 27.4.1 streamoff is described as an
          83                 :    *  implementation defined type.
          84                 :    *  Note: In versions of GCC up to and including GCC 3.3, streamoff
          85                 :    *  was typedef long.
          86                 :   */
          87                 : #ifdef _GLIBCXX_HAVE_INT64_T_LONG
          88                 :   typedef long          streamoff;
          89                 : #elif defined(_GLIBCXX_HAVE_INT64_T_LONG_LONG)
          90                 :   typedef long long     streamoff;
          91                 : #elif defined(_GLIBCXX_HAVE_INT64_T)
          92                 :   typedef int64_t       streamoff;
          93                 : #else
          94                 :   typedef long long     streamoff;
          95                 : #endif
          96                 :
          97                 :   /// Integral type for I/O operation counts and buffer sizes.
          98                 :   typedef ptrdiff_t     streamsize; // Signed integral type
          99                 :
         100                 :   /**
         101                 :    *  @brief  Class representing stream positions.
         102                 :    *
         103                 :    *  The standard places no requirements upon the template parameter StateT.
         104                 :    *  In this implementation StateT must be DefaultConstructible,
         105                 :    *  CopyConstructible and Assignable.  The standard only requires that fpos
         106                 :    *  should contain a member of type StateT. In this implementation it also
         107                 :    *  contains an offset stored as a signed integer.
         108                 :    *
         109                 :    *  @param  StateT  Type passed to and returned from state().
         110                 :    */
         111                 :   template<typename _StateT>
         112                 :     class fpos
         113                 :     {
         114                 :     private:
         115                 :       streamoff                 _M_off;
         116                 :       _StateT                   _M_state;
         117                 :
         118                 :     public:
         119                 :       // The standard doesn't require that fpos objects can be default
         120                 :       // constructed. This implementation provides a default
         121                 :       // constructor that initializes the offset to 0 and default
         122                 :       // constructs the state.
         123                 :       fpos()
         124                 :       : _M_off(0), _M_state() { }
         125                 :
         126                 :       // The standard requires that fpos objects can be constructed
         127                 :       // from streamoff objects using the constructor syntax, and
         128                 :       // fails to give any meaningful semantics. In this
         129                 :       // implementation implicit conversion is also allowed, and this
         130                 :       // constructor stores the streamoff as the offset and default
         131                 :       // constructs the state.
         132                 :       /// Construct position from offset.
         133            2601 :       fpos(streamoff __off)
         134            2601 :       : _M_off(__off), _M_state() { }
         135                 :
         136                 :       /// Convert to streamoff.
         137            1089 :       operator streamoff() const { return _M_off; }
         138                 :
         139                 :       /// Remember the value of @a st.
         140                 :       void
         141                 :       state(_StateT __st)
         142                 :       { _M_state = __st; }
         143                 :
         144                 :       /// Return the last set value of @a st.
         145                 :       _StateT
         146                 :       state() const
         147                 :       { return _M_state; }
         148                 :
         149                 :       // The standard requires that this operator must be defined, but
         150                 :       // gives no semantics. In this implementation it just adds its
         151                 :       // argument to the stored offset and returns *this.
         152                 :       /// Add offset to this position.
         153                 :       fpos&
         154                 :       operator+=(streamoff __off)
         155                 :       {
         156                 :         _M_off += __off;
         157                 :         return *this;
         158                 :       }
         159                 :
         160                 :       // The standard requires that this operator must be defined, but
         161                 :       // gives no semantics. In this implementation it just subtracts
         162                 :       // its argument from the stored offset and returns *this.
         163                 :       /// Subtract offset from this position.
         164                 :       fpos&
         165                 :       operator-=(streamoff __off)
         166                 :       {
         167                 :         _M_off -= __off;
         168                 :         return *this;
         169                 :       }
         170                 :
         171                 :       // The standard requires that this operator must be defined, but
         172                 :       // defines its semantics only in terms of operator-. In this
         173                 :       // implementation it constructs a copy of *this, adds the
         174                 :       // argument to that copy using operator+= and then returns the
         175                 :       // copy.
         176                 :       /// Add position and offset.
         177                 :       fpos
         178                 :       operator+(streamoff __off) const
         179                 :       {
         180                 :         fpos __pos(*this);
         181                 :         __pos += __off;
         182                 :         return __pos;
         183                 :       }
         184                 :
         185                 :       // The standard requires that this operator must be defined, but
         186                 :       // defines its semantics only in terms of operator+. In this
         187                 :       // implementation it constructs a copy of *this, subtracts the
         188                 :       // argument from that copy using operator-= and then returns the
         189                 :       // copy.
         190                 :       /// Subtract offset from position.
         191                 :       fpos
         192                 :       operator-(streamoff __off) const
         193                 :       {
         194                 :         fpos __pos(*this);
         195                 :         __pos -= __off;
         196                 :         return __pos;
         197                 :       }
         198                 :
         199                 :       // The standard requires that this operator must be defined, but
         200                 :       // defines its semantics only in terms of operator+. In this
         201                 :       // implementation it returns the difference between the offset
         202                 :       // stored in *this and in the argument.
         203                 :       /// Subtract position to return offset.
         204                 :       streamoff
         205                 :       operator-(const fpos& __other) const
         206                 :       { return _M_off - __other._M_off; }
         207                 :     };
         208                 :
         209                 :   // The standard only requires that operator== must be an
         210                 :   // equivalence relation. In this implementation two fpos<StateT>
         211                 :   // objects belong to the same equivalence class if the contained
         212                 :   // offsets compare equal.
         213                 :   /// Test if equivalent to another position.
         214                 :   template<typename _StateT>
         215                 :     inline bool
         216                 :     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
         217                 :     { return streamoff(__lhs) == streamoff(__rhs); }
         218                 :
         219                 :   template<typename _StateT>
         220                 :     inline bool
         221                 :     operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
         222                 :     { return streamoff(__lhs) != streamoff(__rhs); }
         223                 :
         224                 :   // Clauses 21.1.3.1 and 21.1.3.2 describe streampos and wstreampos
         225                 :   // as implementation defined types, but clause 27.2 requires that
         226                 :   // they must both be typedefs for fpos<mbstate_t>
         227                 :   /// File position for char streams.
         228                 :   typedef fpos<mbstate_t> streampos;
         229                 :   /// File position for wchar_t streams.
         230                 :   typedef fpos<mbstate_t> wstreampos;
         231                 :
         232                 : #ifdef __GXX_EXPERIMENTAL_CXX0X__
         233                 :   /// File position for char16_t streams.
         234                 :   typedef fpos<mbstate_t> u16streampos;
         235                 :   /// File position for char32_t streams.
         236                 :   typedef fpos<mbstate_t> u32streampos;
         237                 : #endif
         238                 :
         239                 : _GLIBCXX_END_NAMESPACE
         240                 :
         241                 : #endif

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