mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
#ifndef SPROUT_CSTRING_STRRCHR_HPP
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#define SPROUT_CSTRING_STRRCHR_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/iterator/operation.hpp>
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#include <sprout/utility/pair/pair.hpp>
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#include <sprout/type_traits/is_char_type.hpp>
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namespace sprout {
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namespace detail {
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template<typename ForwardIterator, typename T>
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inline SPROUT_CONSTEXPR ForwardIterator
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strrchr_impl_check(sprout::pair<ForwardIterator, ForwardIterator> const& found, T const& value) {
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return *found.second == value ? found.second
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: !value ? found.first
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: ForwardIterator()
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;
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}
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template<typename ForwardIterator, typename T>
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inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator, ForwardIterator>
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strrchr_impl_1(
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sprout::pair<ForwardIterator, ForwardIterator> const& current,
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T const& value,
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typename std::iterator_traits<ForwardIterator>::difference_type n
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)
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{
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typedef sprout::pair<ForwardIterator, ForwardIterator> type;
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return !*current.first ? current
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: n == 1 ? *current.first == value ? type(sprout::next(current.first), current.first) : type(sprout::next(current.first), current.second)
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: sprout::detail::strrchr_impl_1(
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sprout::detail::strrchr_impl_1(
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current,
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value, n / 2
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),
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value, n - n / 2
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)
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;
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}
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template<typename ForwardIterator, typename T>
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inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator, ForwardIterator>
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strrchr_impl(
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sprout::pair<ForwardIterator, ForwardIterator> const& current,
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T const& value,
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typename std::iterator_traits<ForwardIterator>::difference_type n
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)
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{
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return !*current.first ? current
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: sprout::detail::strrchr_impl(
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sprout::detail::strrchr_impl_1(
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current,
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value, n
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),
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value, n * 2
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)
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;
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}
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template<typename ForwardIterator, typename T>
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inline SPROUT_CONSTEXPR ForwardIterator
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strrchr(ForwardIterator first, T const& value) {
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typedef sprout::pair<ForwardIterator, ForwardIterator> type;
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return sprout::detail::strrchr_impl_check(
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sprout::detail::strrchr_impl(type(first, first), value, 1),
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value
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);
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}
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} // namespace detail
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// 7.21.5.5 strrchr <20><EFBFBD>
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//
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// recursion depth:
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// O(log N)
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//
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inline SPROUT_CONSTEXPR char const*
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strrchr(char const* s, int c) {
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return sprout::detail::strrchr(s, static_cast<char>(c));
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}
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inline SPROUT_CONSTEXPR char*
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strrchr(char* s, int c) {
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return sprout::detail::strrchr(s, static_cast<char>(c));
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}
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template<typename Elem>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sprout::is_char_type<Elem>::value,
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Elem*
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>::type
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strrchr(Elem* s, typename std::decay<Elem>::type c) {
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return sprout::detail::strrchr(s, c);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_CSTRING_STRRCHR_HPP
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