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 
00039 #ifndef _CPP_BITS_FPOS_H
00040 #define _CPP_BITS_FPOS_H 1
00041 
00042 #pragma GCC system_header
00043 
00044 #include <bits/c++io.h>
00045 #include <cwchar>   // For mbstate_t.
00046 
00047 namespace std
00048 {
00049   // 27.4.1  Types
00050 
00051   // 27.4.3  Template class fpos
00052   template<typename _StateT>
00053     class fpos
00054     {
00055     public:
00056       // Types:
00057       typedef _StateT __state_type;
00058 
00059     private:
00060       streamoff     _M_off;
00061       __state_type  _M_st;
00062 
00063     public:
00064       __state_type
00065       state() const  { return _M_st; }
00066 
00067       void 
00068       state(__state_type __st)  { _M_st = __st; }
00069 
00070       // NB: The standard defines only the implicit copy ctor and the
00071       // previous two members.  The rest is a "conforming extension".
00072       fpos(): _M_off(streamoff()), _M_st(__state_type()) { }
00073 
00074       fpos(streamoff __off, __state_type __st = __state_type())
00075       :  _M_off(__off), _M_st(__st) { }
00076 
00077       operator streamoff() const { return _M_off; }
00078 
00079       fpos& 
00080       operator+=(streamoff __off) { _M_off += __off; return *this; }
00081 
00082       fpos& 
00083       operator-=(streamoff __off) { _M_off -= __off; return *this; }
00084 
00085       fpos 
00086       operator+(streamoff __off) 
00087       { 
00088     fpos __t(*this); 
00089     __t += __off;
00090     return __t;
00091       }
00092 
00093       fpos      
00094       operator-(streamoff __off) 
00095       { 
00096     fpos __t(*this); 
00097     __t -= __off; 
00098     return __t;
00099       }
00100 
00101       bool  
00102       operator==(const fpos& __pos) const
00103       { return _M_off == __pos._M_off; }
00104 
00105       bool  
00106       operator!=(const fpos& __pos) const
00107       { return _M_off != __pos._M_off; }
00108       
00109       streamoff 
00110       _M_position() const { return _M_off; }
00111 
00112       void
00113       _M_position(streamoff __off)  { _M_off = __off; }
00114     };
00115 
00116   // 27.2, paragraph 10 about fpos/char_traits circularity
00117   typedef fpos<mbstate_t>       streampos;
00118 #  ifdef _GLIBCPP_USE_WCHAR_T
00119   typedef fpos<mbstate_t>       wstreampos;
00120 #  endif
00121 }  // namespace std
00122 
00123 #endif 

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