mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
/*=============================================================================
|
||
Copyright (c) 2011-2016 Bolero MURAKAMI
|
||
https://github.com/bolero-MURAKAMI/Sprout
|
||
|
||
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
||
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||
=============================================================================*/
|
||
#ifndef SPROUT_CSTRING_STRCHR_HPP
|
||
#define SPROUT_CSTRING_STRCHR_HPP
|
||
|
||
#include <iterator>
|
||
#include <type_traits>
|
||
#include <sprout/config.hpp>
|
||
#include <sprout/iterator/operation.hpp>
|
||
#include <sprout/utility/pair/pair.hpp>
|
||
#include <sprout/type_traits/is_char_type.hpp>
|
||
#include <sprout/detail/str.hpp>
|
||
|
||
namespace sprout {
|
||
namespace detail {
|
||
template<typename InputIterator, typename T>
|
||
inline SPROUT_CONSTEXPR sprout::pair<InputIterator, bool>
|
||
strchr_impl_1(
|
||
sprout::pair<InputIterator, bool> const& current,
|
||
T const& value, typename std::iterator_traits<InputIterator>::difference_type n
|
||
)
|
||
{
|
||
typedef sprout::pair<InputIterator, bool> type;
|
||
return current.second || !*current.first ? current
|
||
: n == 1 ? *current.first == value ? type(current.first, true) : type(sprout::next(current.first), false)
|
||
: sprout::detail::strchr_impl_1(
|
||
sprout::detail::strchr_impl_1(
|
||
current,
|
||
value, n / 2
|
||
),
|
||
value, n - n / 2
|
||
)
|
||
;
|
||
}
|
||
template<typename InputIterator, typename T>
|
||
inline SPROUT_CONSTEXPR sprout::pair<InputIterator, bool>
|
||
strchr_impl(
|
||
sprout::pair<InputIterator, bool> const& current,
|
||
T const& value, typename std::iterator_traits<InputIterator>::difference_type n
|
||
)
|
||
{
|
||
return current.second || !*current.first ? current
|
||
: sprout::detail::strchr_impl(
|
||
sprout::detail::strchr_impl_1(
|
||
current,
|
||
value, n
|
||
),
|
||
value, n * 2
|
||
)
|
||
;
|
||
}
|
||
template<typename InputIterator, typename T>
|
||
inline SPROUT_CONSTEXPR InputIterator
|
||
strchr(InputIterator first, T const& value) {
|
||
typedef sprout::pair<InputIterator, bool> type;
|
||
return sprout::detail::strchr_impl(type(first, false), value, 1).first;
|
||
}
|
||
|
||
} // namespace detail
|
||
|
||
// 7.21.5.2 strchr <20><EFBFBD>
|
||
//
|
||
// recursion depth:
|
||
// O(log N)
|
||
//
|
||
inline SPROUT_CONSTEXPR char const*
|
||
strchr(char const* s, int c) {
|
||
return sprout::detail::str_find_check(
|
||
sprout::detail::strchr(s, static_cast<char>(c)),
|
||
static_cast<char>(c)
|
||
);
|
||
}
|
||
inline SPROUT_CONSTEXPR char*
|
||
strchr(char* s, int c) {
|
||
return sprout::detail::str_find_check(
|
||
sprout::detail::strchr(s, static_cast<char>(c)),
|
||
static_cast<char>(c)
|
||
);
|
||
}
|
||
|
||
template<typename Elem>
|
||
inline SPROUT_CONSTEXPR typename std::enable_if<
|
||
sprout::is_char_type<Elem>::value,
|
||
Elem*
|
||
>::type
|
||
strchr(Elem* s, typename std::decay<Elem>::type c) {
|
||
return sprout::detail::str_find_check(
|
||
sprout::detail::strchr(s, c),
|
||
c
|
||
);
|
||
}
|
||
} // namespace sprout
|
||
|
||
#endif // #ifndef SPROUT_CSTRING_STRCHR_HPP
|