122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
// File position object and stream types
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// Copyright (C) 1997-1999 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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//
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// ISO C++ 14882: 27 Input/output library
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//
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#ifndef _CPP_BITS_FPOS_H
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#define _CPP_BITS_FPOS_H 1
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// Need this here as well as in std_ios because fpos is used in
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// char_traits, and char_traits is used by string, which may or may
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// not have included the std_ios file.
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#include <bits/c++io.h>
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namespace std {
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// 27.4.1 Types
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// 27.4.3 Template class fpos
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template<typename _StateT>
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class fpos
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{
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public:
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// Types:
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typedef _StateT __state_type;
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__state_type
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state() const { return _M_st; }
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void
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state(__state_type __st) { _M_st = __st; }
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// NB: The standard defines only the implicit copy ctor and the
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// previous two members. The rest is a "conforming extension".
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fpos(): _M_st(__state_type()), _M_pos(streamoff()) { }
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fpos(streamoff __pos, __state_type __st)
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: _M_st(__st), _M_pos(__pos) { }
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fpos(streamoff __pos)
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: _M_st(), _M_pos(__pos) { }
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operator streamoff() const { return _M_pos; }
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fpos&
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operator+=(streamoff __off) { _M_pos += __off; return *this; }
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fpos&
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operator-=(streamoff __off) { _M_pos -= __off; return *this; }
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bool
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operator==(const fpos& __pos2) const { return _M_pos == __pos2._M_pos; }
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bool
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operator!=(const fpos& __pos2) const { return _M_pos != __pos2._M_pos; }
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streamoff
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_M_position() const { return _M_pos; }
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void
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_M_position(streamoff __pos) { _M_pos = __pos; }
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private:
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__state_type _M_st;
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streamoff _M_pos;
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};
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template<typename _State>
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inline fpos<_State>
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operator+(const fpos<_State>& __pos, streamoff __off)
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{
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fpos<_State> t(__pos);
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return t += __off;
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}
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template<typename _State>
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inline fpos<_State>
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operator-(const fpos<_State>& __pos, streamoff __off)
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{
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fpos<_State> t(__pos);
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return t -= __off;
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}
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template<typename _State>
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inline streamoff
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operator-(const fpos<_State>& __pos1, const fpos<_State>& __pos2)
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{ return __pos1._M_position() - __pos2._M_position(); }
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} // namespace std
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#endif /* _CPP_BITS_FPOS_H */
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