libstdc++-v3/config/os/generic/fpos.h

   1 // File position object and stream types, generic version -*- C++ -*-
   2
   3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20 // USA.
  21
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 //
  32 // ISO C++ 14882: 27 Input/output library
  33 //
  34
  35 /** @file fpos.h
  36  *  This is an internal header file, included by other library headers.
  37  *  You should not attempt to use it directly.
  38  */
  39
  40 #ifndef _CPP_BITS_FPOS_H
  41 #define _CPP_BITS_FPOS_H 1
  42
  43 #pragma GCC system_header
  44
  45 #include <bits/c++io.h>
  46 #include <cwchar>       // For mbstate_t.
  47
  48 namespace std
  49 {
  50   // 27.4.1  Types
  51
  52   // [27.4.3] template class fpos
  53   /**
  54    *  @doctodo
  55   */
  56   template<typename _StateT>
  57     class fpos
  58     {
  59     private:
  60       streamoff         _M_off;
  61       _StateT           _M_st;
  62
  63     public:
  64       _StateT
  65       state() const  { return _M_st; }
  66
  67       void
  68       state(_StateT __st)  { _M_st = __st; }
  69
  70       fpos(): _M_off(streamoff()), _M_st(_StateT()) { }
  71
  72       // NB: The standard defines only the implicit copy ctor and the
  73       // previous two members.  The rest is a "conforming extension".
  74       fpos(streamoff __off, _StateT __st = _StateT())
  75       :  _M_off(__off), _M_st(__st) { }
  76
  77       operator streamoff() const { return _M_off; }
  78
  79       fpos&
  80       operator+=(streamoff __off) { _M_off += __off; return *this; }
  81
  82       fpos&
  83       operator-=(streamoff __off) { _M_off -= __off; return *this; }
  84
  85       fpos
  86       operator+(streamoff __off)
  87       {
  88         fpos __t(*this);
  89         __t += __off;
  90         return __t;
  91       }
  92
  93       fpos
  94       operator-(streamoff __off)
  95       {
  96         fpos __t(*this);
  97         __t -= __off;
  98         return __t;
  99       }
 100
 101       bool
 102       operator==(const fpos& __pos) const
 103       { return _M_off == __pos._M_off; }
 104
 105       bool
 106       operator!=(const fpos& __pos) const
 107       { return !(*this == __pos); }
 108     };
 109
 110   /// 27.2, paragraph 10 about fpos/char_traits circularity
 111   typedef fpos<mbstate_t>               streampos;
 112 #  ifdef _GLIBCXX_USE_WCHAR_T
 113   /// 27.2, paragraph 10 about fpos/char_traits circularity
 114   typedef fpos<mbstate_t>               wstreampos;
 115 #  endif
 116 }  // namespace std
 117
 118 #endif