mirror of
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115 lines
4 KiB
C++
115 lines
4 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 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_ALGORITHM_LEXICOGRAPHICAL_COMPARE_HPP
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#define SPROUT_ALGORITHM_LEXICOGRAPHICAL_COMPARE_HPP
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#include <iterator>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/detail/algorithm/lexicographical_compare.hpp>
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#include <sprout/iterator/distance.hpp>
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#include <sprout/iterator/type_traits/category.hpp>
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#include <sprout/iterator/type_traits/common.hpp>
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#include <sprout/utility/pair/pair.hpp>
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#include <sprout/functional/less.hpp>
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#include HDR_ALGORITHM_MIN_MAX_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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namespace detail {
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template<typename Difference1, typename Difference2>
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inline SPROUT_CONSTEXPR bool
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lexicographical_compare_impl_check(
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Difference1 size1, Difference2 size2,
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int found
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)
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{
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return found < 0 || (found == 2 && size1 < size2);
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}
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template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename Compare>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sprout::is_constant_distance_iterator<RandomAccessIterator1>::value,
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bool
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>::type
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lexicographical_compare(
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RandomAccessIterator1 first1, RandomAccessIterator1 last1, RandomAccessIterator2 first2, RandomAccessIterator2 last2, Compare comp,
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std::random_access_iterator_tag*
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)
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{
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return first2 == last2 ? false
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: first1 == last1 ? true
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: sprout::detail::lexicographical_compare_impl_check(
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sprout::distance(first1, last1), sprout::distance(first2, last2),
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sprout::detail::lexicographical_compare_impl_ra(
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first1, first2, comp,
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NS_SSCRISK_CEL_OR_SPROUT::min(sprout::distance(first1, last1), sprout::distance(first2, last2)),
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2
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)
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)
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;
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}
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template<typename InputIterator1, typename InputIterator2, typename Compare>
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inline SPROUT_CONSTEXPR bool
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lexicographical_compare_impl_check(
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InputIterator1 last1, InputIterator2 last2, Compare comp,
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sprout::pair<InputIterator1, InputIterator2> const& found
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)
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{
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return found.second == last2 ? false
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: found.first == last1 || comp(*found.first, *found.second)
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;
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}
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template<typename InputIterator1, typename InputIterator2, typename Compare>
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inline SPROUT_CONSTEXPR bool
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lexicographical_compare(
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InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2, Compare comp,
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std::input_iterator_tag*
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)
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{
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typedef sprout::pair<InputIterator1, InputIterator2> type;
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return sprout::detail::lexicographical_compare_impl_check(
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last1, last2, comp,
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sprout::detail::lexicographical_compare_impl(type(first1, first2), last1, last2, comp, 1)
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);
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}
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} // namespace detail
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// 25.4.8 Lexicographical comparison
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//
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// recursion depth:
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// O(log(N1+N2))
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//
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template<typename InputIterator1, typename InputIterator2, typename Compare>
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inline SPROUT_CONSTEXPR bool
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lexicographical_compare(
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InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, InputIterator2 last2,
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Compare comp
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)
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{
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typedef typename sprout::common_iterator_category<InputIterator1, InputIterator2>::type* category;
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return sprout::detail::lexicographical_compare(first1, last1, first2, last2, comp, category());
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}
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template<typename InputIterator1, typename InputIterator2>
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inline SPROUT_CONSTEXPR bool
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lexicographical_compare(
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InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, InputIterator2 last2
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)
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{
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return sprout::lexicographical_compare(
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first1, last1, first2, last2,
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sprout::less<>()
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);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_LEXICOGRAPHICAL_COMPARE_HPP
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