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Sprout/sprout/iterator/replace_iterator.hpp

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/*=============================================================================
Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_ITERATOR_REPLACE_ITERATOR_HPP
#define SPROUT_ITERATOR_REPLACE_ITERATOR_HPP
#include <sprout/config.hpp>
#include <sprout/iterator/transform_iterator.hpp>
namespace sprout {
//
// replace_value
//
template<typename T>
class replace_value {
public:
typedef T result_type;
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typedef T argument_type;
private:
T old_;
T new_;
public:
SPROUT_CONSTEXPR replace_value(T const& old_value, T const& new_value)
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: old_(old_value), new_(new_value)
{}
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SPROUT_CONSTEXPR T
operator()(T const& value) const {
return (value == old_) ? new_ : value;
}
};
//
// make_replace_iterator
//
template<typename T, typename Iterator>
inline SPROUT_CONSTEXPR sprout::transform_iterator<sprout::replace_value<T>, Iterator>
make_replace_iterator(Iterator it, T const& old_value, T const& new_value) {
return sprout::transform_iterator<sprout::replace_value<T>, Iterator>(
it, sprout::replace_value<T>(old_value, new_value)
);
}
} // namespace sprout
#endif // #ifndef SPROUT_ITERATOR_REPLACE_ITERATOR_HPP