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: 2012-06-02 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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