# 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