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fpos.h

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00001 // File position object and stream types
00002 
00003 // Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 //
00031 // ISO C++ 14882: 27 Input/output library
00032 //
00033 
00034 #ifndef _CPP_BITS_FPOS_H
00035 #define _CPP_BITS_FPOS_H 1
00036 
00037 #pragma GCC system_header
00038 
00039 #include <bits/c++io.h>
00040 #include <bits/std_cwchar.h>    // For mbstate_t.
00041 
00042 namespace std
00043 {
00044   // 27.4.1  Types
00045 
00046   // 27.4.3  Template class fpos
00047   template<typename _StateT>
00048     class fpos
00049     {
00050     public:
00051       // Types:
00052       typedef _StateT __state_type;
00053 
00054     private:
00055       __state_type  _M_st;
00056       streamoff     _M_off;
00057 
00058     public:
00059       __state_type
00060       state() const  { return _M_st; }
00061 
00062       void 
00063       state(__state_type __st)  { _M_st = __st; }
00064 
00065       // NB: The standard defines only the implicit copy ctor and the
00066       // previous two members.  The rest is a "conforming extension".
00067       fpos(): _M_st(__state_type()), _M_off(streamoff()) { }
00068 
00069       fpos(streamoff __off, __state_type __st = __state_type())
00070       : _M_st(__st), _M_off(__off) { }
00071 
00072       operator streamoff() const { return _M_off; }
00073 
00074       fpos& 
00075       operator+=(streamoff __off) { _M_off += __off; return *this; }
00076 
00077       fpos& 
00078       operator-=(streamoff __off) { _M_off -= __off; return *this; }
00079 
00080       fpos& 
00081       operator+(streamoff __off) 
00082       { 
00083     fpos t(*this); 
00084     return t += __off; 
00085       }
00086 
00087       fpos&      
00088       operator-(streamoff __off) 
00089       { 
00090     fpos t(*this); 
00091     return t -= __off; 
00092       }
00093 
00094       bool  
00095       operator==(const fpos& __pos) const
00096       { return _M_off == __pos._M_off; }
00097 
00098       bool  
00099       operator!=(const fpos& __pos) const
00100       { return _M_off != __pos._M_off; }
00101       
00102       streamoff 
00103       _M_position() const { return _M_off; }
00104 
00105       void
00106       _M_position(streamoff __off)  { _M_off = __off; }
00107     };
00108 
00109   // 27.2, paragraph 10 about fpos/char_traits circularity
00110   typedef fpos<mbstate_t>       streampos;
00111 #  ifdef _GLIBCPP_USE_WCHAR_T
00112   typedef fpos<mbstate_t>       wstreampos;
00113 #  endif
00114 }  // namespace std
00115 
00116 #endif 
00117 
00118 
00119 

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