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// Copyright (c) 1997
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Stream_support/include/CGAL/IO/Istream_iterator.h $
// $Id: include/CGAL/IO/Istream_iterator.h b26b07a1242 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Lutz Kettner <kettner@inf.ethz.ch>
#ifndef CGAL_IO_ISTREAM_ITERATOR_H
#define CGAL_IO_ISTREAM_ITERATOR_H
#include <CGAL/circulator.h>
namespace CGAL {
/*!
\ingroup PkgStreamSupportRef
The class `Istream_iterator` is an input iterator adaptor for the
input stream class `Stream` and value type `T`. It is particularly
useful for classes that are similar but not compatible to `std::istream`.
\cgalModels{InputIterator}
*/
template <class T, class Stream>
class Istream_iterator
{
protected:
Stream* stream;
T value;
void read()
{
if(stream)
{
if(*stream)
{
*stream >> value;
if(! *stream)
stream = 0;
}
else
{
stream = 0;
}
}
}
public:
typedef T value_type;
typedef const T& reference;
typedef const T& const_reference;
typedef const T* pointer;
typedef const T* const_pointer;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
typedef std::input_iterator_tag iterator_category;
typedef Istream_iterator<T,Stream> Self;
/// \name Creation
/// @{
/*!
creates an end-of-stream iterator.
This is a past-the-end iterator, and it is useful
when constructing a range.
*/
Istream_iterator() : stream(0) {}
/*!
creates an input iterator reading from `s`.
When `s` reaches end of stream,
this iterator will compare equal to an end-of-stream iterator
created using the default constructor.
*/
Istream_iterator(Stream& s) : stream(&s) { read(); }
/// @}
bool operator==( const Self& i) const { return stream == i.stream; }
bool operator!=( const Self& i) const { return stream != i.stream; }
reference operator*() const { return value; }
#ifdef CGAL_ARROW_OPERATOR
pointer operator->() const { return &(operator*()); }
#endif
Self& operator++()
{
read();
return *this;
}
Self operator++(int)
{
Self tmp = *this;
read();
return tmp;
}
};
} // namespace CGAL
#endif // CGAL_IO_ISTREAM_ITERATOR_H
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