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fix recursion depth: cstring algorithm

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This commit is contained in:
bolero-MURAKAMI 2013-01-13 01:16:48 +09:00
parent f26032dce8
commit b51b14efa9
25 changed files with 792 additions and 142 deletions
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84
sprout/cstring/strpbrk.hpp
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@ -1,25 +1,93 @@
#ifndef SPROUT_CSTRING_STRPBRK_HPP
#define SPROUT_CSTRING_STRPBRK_HPP
#include <cstddef>
#include <iterator>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/iterator/operation.hpp>
#include <sprout/utility/pair.hpp>
#include <sprout/type_traits/is_char_type.hpp>
#include <sprout/cstring/strchr.hpp>
#include <sprout/detail/str.hpp>
namespace sprout {
// Copyright (C) 2011 RiSK (sscrisk)
namespace detail {
template<typename InputIterator1, typename ForwardIterator2>
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, bool>
strpbrk_impl_1(
sprout::pair<InputIterator1, bool> current,
ForwardIterator2 first2,
typename std::iterator_traits<InputIterator1>::difference_type n
)
{
typedef sprout::pair<InputIterator1, bool> type;
return current.second || !*current.first ? current
: n == 1 ? sprout::strchr(first2, *current.first)
? type(current.first, true)
: type(sprout::next(current.first), false)
: sprout::detail::strpbrk_impl_1(
sprout::detail::strpbrk_impl_1(
current,
first2, n / 2
),
first2, n - n / 2
)
;
}
template<typename InputIterator1, typename ForwardIterator2>
inline SPROUT_CONSTEXPR sprout::pair<InputIterator1, bool>
strpbrk_impl(
sprout::pair<InputIterator1, bool> current,
ForwardIterator2 first2,
typename std::iterator_traits<InputIterator1>::difference_type n
)
{
typedef sprout::pair<InputIterator1, bool> type;
return current.second || !*current.first ? current
: sprout::detail::strpbrk_impl(
sprout::detail::strpbrk_impl_1(
current,
first2, n
),
first2, n * 2
)
;
}
template<typename InputIterator1, typename ForwardIterator2>
inline SPROUT_CONSTEXPR InputIterator1
strpbrk(InputIterator1 first1, ForwardIterator2 first2) {
typedef sprout::pair<InputIterator1, bool> type;
return sprout::detail::strpbrk_impl(type(first1, false), first2, 1).first;
}
} // namespace detail
// 7.21.5.4 strpbrk ŠÖ<C5A0>”
//
// recursion depth:
// O(log(N1+N2))
//
inline SPROUT_CONSTEXPR char const*
strpbrk(char const* s1, char const* s2) {
return !*s1 ? nullptr
: sprout::strchr(s2, *s1) ? s1
: sprout::strpbrk(s1 + 1, s2)
;
return sprout::detail::str_find_check(
sprout::detail::strpbrk(s1, s2)
);
}
inline SPROUT_CONSTEXPR char*
strpbrk(char* s1, char const* s2) {
return const_cast<char*>(sprout::strpbrk(const_cast<char const*>(s1), s2));
return sprout::detail::str_find_check(
sprout::detail::strpbrk(s1, s2)
);
}
template<typename Elem>
inline SPROUT_CONSTEXPR typename std::enable_if<
sprout::is_char_type<Elem>::value,
Elem*
>::type
strpbrk(Elem* s1, typename std::remove_const<Elem>::type const* s2) {
return sprout::detail::str_find_check(
sprout::detail::strpbrk(s1, s2)
);
}
} // namespace sprout