0161a0f684
This is a utility class meant to provide a helper which permits returning a range for iteration via a named pair of iterators. It serves as an adapter for creating a C++11 friendly interface for iteration.
79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
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/*
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* Copyright (c) 2014 Saleem Abdulrasool
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*
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* This file is part of the Paludis package manager. Paludis is free software;
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* you can redistribute it and/or modify it under the terms of the GNU General
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* Public License version 2, as published by the Free Software Foundation.
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*
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* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PALUDIS_GUARD_PALUDIS_UTIL_ITERATOR_RANGE_HH
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#define PALUDIS_GUARD_PALUDIS_UTIL_ITERATOR_RANGE_HH 1
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#include <iterator>
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#include <utility>
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namespace paludis
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{
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template <typename Iterator_>
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class IteratorRange
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{
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private:
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Iterator_ _begin, _end;
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public:
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// TODO(compnerd) use SFINAE to ensure that the container's
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// iterators match the range's iterator
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template <typename Container_>
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IteratorRange(Container_ && container)
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: _begin(std::begin(container)), _end(std::end(container))
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{
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}
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IteratorRange(Iterator_ begin, Iterator_ end)
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: _begin(std::move(begin)), _end(std::move(end))
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{
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}
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Iterator_ begin() const
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{
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return _begin;
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}
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Iterator_ end() const
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{
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return _end;
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}
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size_t size() const
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{
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return std::distance(_end, _begin);
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}
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};
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template <typename Iterator_>
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IteratorRange<Iterator_> make_range(Iterator_ begin, Iterator_ end)
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{
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return IteratorRange<Iterator_>(std::move(begin), std::move(end));
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}
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template <typename Iterator_>
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IteratorRange<Iterator_> make_range(std::pair<Iterator_, Iterator_> range)
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{
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return IteratorRange<Iterator_>(std::move(range.first),
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std::move(range.second));
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}
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}
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#endif
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