157 lines
4.8 KiB
C++
157 lines
4.8 KiB
C++
// Stream iterators
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// Copyright (C) 2001 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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/** @file stream_iterator.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _CPP_BITS_STREAM_ITERATOR_H
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#define _CPP_BITS_STREAM_ITERATOR_H 1
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#pragma GCC system_header
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namespace std
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{
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template<typename _Tp, typename _CharT = char,
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typename _Traits = char_traits<_CharT>, typename _Dist = ptrdiff_t>
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class istream_iterator
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: public iterator<input_iterator_tag, _Tp, _Dist, const _Tp*, const _Tp&>
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{
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public:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef basic_istream<_CharT, _Traits> istream_type;
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private:
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istream_type* _M_stream;
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_Tp _M_value;
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bool _M_ok;
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public:
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istream_iterator() : _M_stream(0), _M_ok(false) {}
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istream_iterator(istream_type& __s) : _M_stream(&__s) { _M_read(); }
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istream_iterator(const istream_iterator& __obj)
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: _M_stream(__obj._M_stream), _M_value(__obj._M_value),
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_M_ok(__obj._M_ok)
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{ }
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const _Tp&
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operator*() const { return _M_value; }
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const _Tp*
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operator->() const { return &(operator*()); }
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istream_iterator&
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operator++()
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{ _M_read(); return *this; }
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istream_iterator
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operator++(int)
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{
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istream_iterator __tmp = *this;
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_M_read();
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return __tmp;
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}
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bool
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_M_equal(const istream_iterator& __x) const
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{ return (_M_ok == __x._M_ok) && (!_M_ok || _M_stream == __x._M_stream);}
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private:
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void
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_M_read()
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{
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_M_ok = (_M_stream && *_M_stream) ? true : false;
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if (_M_ok)
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{
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*_M_stream >> _M_value;
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_M_ok = *_M_stream ? true : false;
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}
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}
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};
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template<typename _Tp, typename _CharT, typename _Traits, typename _Dist>
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inline bool
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operator==(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
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const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __y)
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{ return __x._M_equal(__y); }
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template <class _Tp, class _CharT, class _Traits, class _Dist>
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inline bool
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operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
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const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __y)
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{ return !__x._M_equal(__y); }
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template<typename _Tp, typename _CharT = char,
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typename _Traits = char_traits<_CharT> >
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class ostream_iterator
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: public iterator<output_iterator_tag, void, void, void, void>
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{
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public:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef basic_ostream<_CharT, _Traits> ostream_type;
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private:
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ostream_type* _M_stream;
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const _CharT* _M_string;
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public:
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ostream_iterator(ostream_type& __s) : _M_stream(&__s), _M_string(0) {}
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ostream_iterator(ostream_type& __s, const _CharT* __c)
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: _M_stream(&__s), _M_string(__c) { }
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ostream_iterator(const ostream_iterator& __obj)
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: _M_stream(__obj._M_stream), _M_string(__obj._M_string) { }
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ostream_iterator&
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operator=(const _Tp& __value)
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{
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*_M_stream << __value;
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if (_M_string) *_M_stream << _M_string;
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return *this;
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}
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ostream_iterator&
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operator*() { return *this; }
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ostream_iterator&
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operator++() { return *this; }
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ostream_iterator&
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operator++(int) { return *this; }
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};
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} // namespace std
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#endif
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