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https://github.com/bolero-MURAKAMI/Sprout
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41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
#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
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//
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template<typename T>
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class replace_value {
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public:
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typedef T result_type;
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typedef T const& argument_type;
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private:
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T old_;
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T new_;
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public:
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SPROUT_CONSTEXPR replace_value(T const& old_value, T const& new_value)
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: old_(old_value)
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, new_(new_value)
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{}
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SPROUT_CONSTEXPR T operator()(T const& value) const {
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return (value == old_) ? new_ : value;
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}
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};
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//
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// make_replace_iterator
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//
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template<typename T, typename Iterator>
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inline SPROUT_CONSTEXPR sprout::transform_iterator<sprout::replace_value<T>, Iterator>
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make_replace_iterator(Iterator it, T const& old_value, T const& new_value) {
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return sprout::transform_iterator<sprout::replace_value<T>, Iterator>(
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it, sprout::replace_value<T>(old_value, 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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