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48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 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_REPLACE_IF_ITERATOR_HPP
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#define SPROUT_ITERATOR_REPLACE_IF_ITERATOR_HPP
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#include <sprout/config.hpp>
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#include <sprout/iterator/transform_iterator.hpp>
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namespace sprout {
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//
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// replace_value_if
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//
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template<typename Predicate, typename T>
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class replace_value_if {
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public:
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typedef Predicate predicate_type;
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typedef T result_type;
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typedef T argument_type;
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private:
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Predicate pred_;
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T new_;
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public:
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SPROUT_CONSTEXPR replace_value_if(Predicate pred, T const& new_value)
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: pred_(pred), new_(new_value)
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{}
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SPROUT_CONSTEXPR T operator()(T const& value) const {
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return pred_(value) ? new_ : value;
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}
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};
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//
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// make_replace_if_iterator
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//
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template<typename Predicate, typename T, typename Iterator>
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inline SPROUT_CONSTEXPR sprout::transform_iterator<sprout::replace_value_if<Predicate, T>, Iterator>
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make_replace_if_iterator(Iterator it, Predicate pred, T const& new_value) {
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return sprout::transform_iterator<sprout::replace_value_if<Predicate, T>, Iterator>(
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it, sprout::replace_value_if<Predicate, T>(pred, new_value)
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);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ITERATOR_REPLACE_IF_ITERATOR_HPP
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