mirror of https://github.com/CGAL/cgal
84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
// Copyright (c) 1997 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $Source$
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// $Revision$ $Date$
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// $Name$
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//
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// Author(s) : Lutz Kettner <kettner@inf.ethz.ch>
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#ifndef CGAL_IO_ISTREAM_ITERATOR_H
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#define CGAL_IO_ISTREAM_ITERATOR_H
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#include <CGAL/circulator.h>
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CGAL_BEGIN_NAMESPACE
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template <class T, class Stream>
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class Istream_iterator {
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protected:
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Stream* stream;
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T value;
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void read() {
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if ( stream) {
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if ( *stream) {
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*stream >> value;
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if ( ! *stream)
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stream = 0;
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} else
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stream = 0;
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}
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}
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public:
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typedef T value_type;
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typedef const T& reference;
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typedef const T& const_reference;
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typedef const T* pointer;
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typedef const T* const_pointer;
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typedef std::size_t size_type;
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typedef std::ptrdiff_t difference_type;
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typedef std::input_iterator_tag iterator_category;
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typedef Istream_iterator<T,Stream> Self;
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Istream_iterator() : stream(0) {}
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Istream_iterator( Stream& s) : stream(&s) { read(); }
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bool operator==( const Self& i) const {
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return stream == i.stream;
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}
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bool operator!=( const Self& i) const {
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return stream != i.stream;
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}
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reference operator*() const { return value; }
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#ifdef CGAL_ARROW_OPERATOR
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pointer operator->() const { return &(operator*()); }
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#endif
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Self& operator++() {
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read();
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return *this;
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}
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Self operator++(int) {
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Self tmp = *this;
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read();
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return tmp;
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}
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};
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CGAL_END_NAMESPACE
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#endif // CGAL_IO_ISTREAM_ITERATOR_H
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