120 lines
2.2 KiB
C++
120 lines
2.2 KiB
C++
// Copyright (c) 2014 GeometryFactory (France). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/STL_Extension/include/CGAL/Iterator_range.h $
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// $Id: Iterator_range.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Andreas Fabri
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#ifndef CGAL_ITERATOR_RANGE_H
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#define CGAL_ITERATOR_RANGE_H
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#include <CGAL/tuple.h>
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#include <utility>
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#include <boost/foreach.hpp>
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namespace CGAL {
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/*!
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\ingroup PkgSTLExtensionRef
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/// `CGAL::Iterator_range` is a...
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*/
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template <typename I>
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class Iterator_range
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: public std::pair<I,I>{
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typedef std::pair<I,I> Base;
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public:
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typedef I iterator;
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typedef I const_iterator;
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Iterator_range(I b, I e)
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: Base(b,e)
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{}
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// Iterator_range(const Iterator_range& ip)
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// : Base(ip)
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// {}
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Iterator_range(const std::pair<I,I>& ip)
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: Base(ip)
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{}
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I begin() const
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{
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return this->first;
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}
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I end() const
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{
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return this->second;
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}
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/// returns `std::distance(begin(), end())`
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std::size_t
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size() const
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{
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return static_cast<std::size_t>(std::distance(begin(), end()));
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}
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/// returns `std::distance(begin(), end())==0`
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bool empty() const
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{
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return begin()==end();
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}
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#ifndef CGAL_CFG_NO_CPP0X_TUPLE
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operator std::tuple<I&, I&>()
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{
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return std::tuple<I&, I&>{this->first, this->second};
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}
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operator std::tuple<const I&, const I&>() const
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{
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return std::tuple<const I&, const I&>{this->first, this->second};
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}
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#endif
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};
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template <typename T>
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Iterator_range<T>
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make_range(const T& b, const T&e)
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{
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return Iterator_range<T>(b,e);
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}
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template <typename T>
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Iterator_range<T>
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make_range(const std::pair<T,T>& p)
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{
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return Iterator_range<T>(p.first,p.second);
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}
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} // namespace CGAL
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// At global scope...
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template<typename T>
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inline boost::mpl::true_ *
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boost_foreach_is_lightweight_proxy( CGAL::Iterator_range<T> *&, boost::foreach::tag )
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{
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return 0;
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}
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namespace boost { namespace foreach
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{
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template<typename T>
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struct is_lightweight_proxy< CGAL::Iterator_range<T> >
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: mpl::true_
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{
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};
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}}
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#endif // CGAL_ITERATOR_RANGE_H
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