mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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132 lines
3.2 KiB
C++
132 lines
3.2 KiB
C++
#ifndef SPROUT_DETAIL_ALGORITHM_HPP
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#define SPROUT_DETAIL_ALGORITHM_HPP
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#include <iterator>
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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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namespace detail {
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//
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// min
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//
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template<typename T>
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SPROUT_CONSTEXPR T const& min(T const& a, T const& b) {
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return b < a ? b : a;
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}
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template<typename T, typename Compare>
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SPROUT_CONSTEXPR T const& min(T const& a, T const& b, Compare comp) {
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return comp(b, a) ? b : a;
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}
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//
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// max
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//
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template<typename T>
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SPROUT_CONSTEXPR T const& max(T const& a, T const& b) {
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return a < b ? b : a;
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}
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template<typename T, typename Compare>
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SPROUT_CONSTEXPR T const& max(T const& a, T const& b, Compare comp) {
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return comp(a, b) ? b : a;
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}
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//
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// count
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//
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template<typename Iterator, typename T>
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SPROUT_CONSTEXPR typename std::iterator_traits<Iterator>::difference_type count(
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Iterator first,
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Iterator last,
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T const & value
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)
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{
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return first == last
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? 0
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: (*first == value ? 1 : 0) + sprout::detail::count(sprout::next(first), last, value)
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;
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}
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//
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// count_if
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//
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template<typename Iterator, typename Predicate>
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SPROUT_CONSTEXPR typename std::iterator_traits<Iterator>::difference_type count_if(
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Iterator first,
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Iterator last,
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Predicate pred
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)
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{
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return first == last
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? 0
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: (pred(*first) ? 1 : 0) + sprout::detail::count_if(sprout::next(first), last, pred);
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}
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//
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// equal
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//
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template<typename Iterator1, typename Iterator2>
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SPROUT_CONSTEXPR bool equal(
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Iterator1 first1,
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Iterator1 last1,
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Iterator2 first2
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)
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{
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return first1 == last1
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? true
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: *first1 == *first2 && sprout::detail::equal(sprout::next(first1), last1, sprout::next(first2))
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;
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}
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template<typename Iterator1, typename Iterator2, typename Predicate>
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SPROUT_CONSTEXPR bool equal(
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Iterator1 first1,
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Iterator1 last1,
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Iterator2 first2,
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Predicate pred
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)
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{
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return first1 == last1
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? true
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: pred(*first1, *first2) && sprout::detail::equal(sprout::next(first1), last1, sprout::next(first2), pred);
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}
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//
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// lexicographical_compare
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//
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template<typename Iterator1, typename Iterator2>
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SPROUT_CONSTEXPR bool lexicographical_compare(
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Iterator1 first1,
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Iterator1 last1,
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Iterator2 first2,
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Iterator2 last2
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)
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{
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return first2 == last2
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? false
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: first1 == last1 || *first1 < *first2
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? true
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: *first2 < *first1
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? false
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: sprout::detail::lexicographical_compare(sprout::next(first1), last1, sprout::next(first2), last2);
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}
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template<typename Iterator1, typename Iterator2, typename Compare>
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SPROUT_CONSTEXPR bool lexicographical_compare(
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Iterator1 first1,
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Iterator1 last1,
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Iterator2 first2,
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Iterator2 last2,
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Compare comp
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)
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{
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return first2 == last2
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? false
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: first1 == last1 || comp(*first1, *first2)
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? true
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: comp(*first2, *first1)
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? false
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: sprout::detail::lexicographical_compare(sprout::next(first1), last1, sprout::next(first2), last2, comp);
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}
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_DETAIL_ALGORITHM_HPP
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