mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
#ifndef SPROUT_CSTRING_STRCHR_HPP
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#define SPROUT_CSTRING_STRCHR_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.hpp>
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#include <sprout/type_traits/is_char_type.hpp>
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#include <sprout/detail/str.hpp>
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namespace sprout {
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namespace detail {
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template<typename InputIterator, typename T>
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inline SPROUT_CONSTEXPR sprout::pair<InputIterator, bool>
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strchr_impl_1(
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sprout::pair<InputIterator, bool> const& current,
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T const& value, typename std::iterator_traits<InputIterator>::difference_type n
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)
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{
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typedef sprout::pair<InputIterator, bool> type;
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return current.second || !*current.first ? current
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: n == 1 ? *current.first == value ? type(current.first, true) : type(sprout::next(current.first), false)
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: sprout::detail::strchr_impl_1(
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sprout::detail::strchr_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 InputIterator, typename T>
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inline SPROUT_CONSTEXPR sprout::pair<InputIterator, bool>
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strchr_impl(
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sprout::pair<InputIterator, bool> const& current,
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T const& value, typename std::iterator_traits<InputIterator>::difference_type n
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)
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{
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typedef sprout::pair<InputIterator, bool> type;
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return current.second || !*current.first ? current
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: sprout::detail::strchr_impl(
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sprout::detail::strchr_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 InputIterator, typename T>
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inline SPROUT_CONSTEXPR InputIterator
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strchr(InputIterator first, T const& value) {
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typedef sprout::pair<InputIterator, bool> type;
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return sprout::detail::strchr_impl(type(first, false), value, 1).first;
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}
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} // namespace detail
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// 7.21.5.2 strchr ŠÖ<C5A0>”
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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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strchr(char const* s, int c) {
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return sprout::detail::str_find_check(
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sprout::detail::strchr(s, static_cast<char>(c)),
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static_cast<char>(c)
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);
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}
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inline SPROUT_CONSTEXPR char*
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strchr(char* s, int c) {
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return sprout::detail::str_find_check(
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sprout::detail::strchr(s, static_cast<char>(c)),
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static_cast<char>(c)
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);
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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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strchr(Elem* s, typename std::decay<Elem>::type c) {
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return sprout::detail::str_find_check(
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sprout::detail::strchr(s, c),
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c
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);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_CSTRING_STRCHR_HPP
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