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47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
#ifndef SPROUT_ALGORITHM_SEARCH_N_HPP
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#define SPROUT_ALGORITHM_SEARCH_N_HPP
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#include <sprout/config.hpp>
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#include <sprout/iterator/operation.hpp>
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namespace sprout {
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// Copyright (C) 2011 RiSK (sscrisk)
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// 25.2.13 Search
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template<typename ForwardIterator, typename Size, typename T>
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SPROUT_CONSTEXPR ForwardIterator search_n(
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ForwardIterator first,
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ForwardIterator last,
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Size count,
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T const& value
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)
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{
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return first == last || count == 0 ? first
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: sprout::next(first) == last && count > 1 ? last
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: *first == value
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&& sprout::search_n(sprout::next(first), last, count - 1, value) == sprout::next(first)
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? first
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: sprout::search_n(sprout::next(first), last, count, value)
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;
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}
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template<typename ForwardIterator, typename Size, typename T, typename BinaryPredicate>
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SPROUT_CONSTEXPR ForwardIterator search_n(
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ForwardIterator first,
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ForwardIterator last,
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Size count,
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T const& value,
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BinaryPredicate pred
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)
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{
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return first == last || count == 0 ? first
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: sprout::next(first) == last && count > 1 ? last
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: *first == value
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&& sprout::search_n(sprout::next(first), last, count - 1, value, pred) == sprout::next(first)
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? first
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: sprout::search_n(sprout::next(first), last, count, value, pred)
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;
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_SEARCH_N_HPP
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