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57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2013 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_ITERATOR_UNIQUE_ITERATOR_HPP
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#define SPROUT_ITERATOR_UNIQUE_ITERATOR_HPP
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#include <sprout/config.hpp>
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#include <sprout/iterator/adjacent_filter_iterator.hpp>
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#include <sprout/functional/equal_to.hpp>
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namespace sprout {
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//
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// unique_filter
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//
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template<typename Predicate = sprout::equal_to<> >
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class unique_filter {
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public:
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typedef bool result_type;
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private:
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Predicate pred_;
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public:
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SPROUT_CONSTEXPR unique_filter()
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: pred_()
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{}
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explicit SPROUT_CONSTEXPR unique_filter(Predicate pred)
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: pred_(pred)
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{}
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template<typename T, typename U>
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SPROUT_CONSTEXPR bool operator()(T const& lhs, U const& rhs) const {
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return !pred_(lhs, rhs);
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}
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};
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//
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// make_unique_iterator
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//
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template<typename Predicate, typename Iterator>
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inline SPROUT_CONSTEXPR sprout::adjacent_filter_iterator<sprout::unique_filter<Predicate>, Iterator>
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make_unique_iterator(Predicate pred, Iterator it, Iterator last = Iterator()) {
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return sprout::adjacent_filter_iterator<sprout::unique_filter<Predicate>, Iterator>(
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sprout::unique_filter<Predicate>(pred), it, last
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);
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}
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template<typename Iterator>
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inline SPROUT_CONSTEXPR sprout::adjacent_filter_iterator<sprout::unique_filter<>, Iterator>
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make_unique_iterator(Iterator it, Iterator last = Iterator()) {
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return sprout::adjacent_filter_iterator<sprout::unique_filter<>, Iterator>(
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sprout::unique_filter<>(), it, last
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);
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}
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} // namespace sprout
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#endif // SPROUT_ITERATOR_UNIQUE_ITERATOR_HPP
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