libstdc++-v3/include/bits/fpos.h

   1 // File position object and stream types
   2
   3 // Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 //
  31 // ISO C++ 14882: 27 Input/output library
  32 //
  33
  34 /** @file fpos.h
  35  *  This is an internal header file, included by other library headers.
  36  *  You should not attempt to use it directly.
  37  */
  38
  39 #ifndef _CPP_BITS_FPOS_H
  40 #define _CPP_BITS_FPOS_H 1
  41
  42 #pragma GCC system_header
  43
  44 #include <bits/c++io.h>
  45 #include <bits/std_cwchar.h>    // For mbstate_t.
  46
  47 namespace std
  48 {
  49   // 27.4.1  Types
  50
  51   // 27.4.3  Template class fpos
  52   template<typename _StateT>
  53     class fpos
  54     {
  55     public:
  56       // Types:
  57       typedef _StateT __state_type;
  58
  59     private:
  60       streamoff         _M_off;
  61       __state_type      _M_st;
  62
  63     public:
  64       __state_type
  65       state() const  { return _M_st; }
  66
  67       void
  68       state(__state_type __st)  { _M_st = __st; }
  69
  70       // NB: The standard defines only the implicit copy ctor and the
  71       // previous two members.  The rest is a "conforming extension".
  72       fpos(): _M_off(streamoff()), _M_st(__state_type()) { }
  73
  74       fpos(streamoff __off, __state_type __st = __state_type())
  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 _M_off != __pos._M_off; }
 108
 109       streamoff
 110       _M_position() const { return _M_off; }
 111
 112       void
 113       _M_position(streamoff __off)  { _M_off = __off; }
 114     };
 115
 116   // 27.2, paragraph 10 about fpos/char_traits circularity
 117   typedef fpos<mbstate_t>               streampos;
 118 #  ifdef _GLIBCPP_USE_WCHAR_T
 119   typedef fpos<mbstate_t>               wstreampos;
 120 #  endif
 121 }  // namespace std
 122
 123 #endif
 124
 125
 126