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https://github.com/bolero-MURAKAMI/Sprout.git
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74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
#ifndef SPROUT_ALGORITHM_IS_PERMUTATION_HPP
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#define SPROUT_ALGORITHM_IS_PERMUTATION_HPP
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#include <sprout/config.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/algorithm/count.hpp>
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#include <sprout/algorithm/count_if.hpp>
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#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
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#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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// Copyright (C) 2011 RiSK (sscrisk)
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namespace detail {
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template<typename ForwardIterator1, typename ForwardIterator2>
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inline SPROUT_CONSTEXPR bool is_permutation_impl(
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ForwardIterator1 first1,
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ForwardIterator1 last1,
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ForwardIterator2 first2,
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ForwardIterator1 first1_
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)
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{
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return first1_ == last1 ? true
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: sprout::count(first1, last1, *first1_)
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== sprout::count(first2, sprout::next(first2, NS_SSCRISK_CEL_OR_SPROUT::distance(first1, last1)), *first1_)
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&& sprout::detail::is_permutation_impl(first1, last1, first2, sprout::next(first1_))
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? true
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: false
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;
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}
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template<typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR bool is_permutation_impl(
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ForwardIterator1 first1,
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ForwardIterator1 last1,
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ForwardIterator2 first2,
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ForwardIterator1 first1_,
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BinaryPredicate pred
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)
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{
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return first1_ == last1 ? true
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: sprout::count_if(first1, last1, NS_SSCRISK_CEL_OR_SPROUT::bind2nd(pred, *first1_))
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== sprout::count_if(first2, sprout::next(first2, NS_SSCRISK_CEL_OR_SPROUT::distance(first1, last1)), NS_SSCRISK_CEL_OR_SPROUT::bind2nd(pred, *first1_))
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&& sprout::detail::is_permutation_impl(first1, last1, first2, sprout::next(first1_), pred)
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? true
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: false
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;
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}
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} // namespace detail
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// 25.2.12 Is permutation
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template<typename ForwardIterator1, typename ForwardIterator2>
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inline SPROUT_CONSTEXPR bool is_permutation(
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ForwardIterator1 first1,
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ForwardIterator1 last1,
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ForwardIterator2 first2
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)
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{
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return sprout::detail::is_permutation_impl(first1, last1, first2, first1);
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}
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template<typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR bool is_permutation(
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ForwardIterator1 first1,
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ForwardIterator1 last1,
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ForwardIterator2 first2,
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BinaryPredicate pred
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)
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{
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return sprout::detail::is_permutation_impl(first1, last1, first2, first1, pred);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_IS_PERMUTATION_HPP
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