mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
/*=============================================================================
|
||
Copyright (c) 2011-2014 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_MEMCHR_HPP
|
||
#define SPROUT_CSTRING_MEMCHR_HPP
|
||
|
||
#include <type_traits>
|
||
#include <utility>
|
||
#include <sprout/config.hpp>
|
||
#include <sprout/workaround/std/cstddef.hpp>
|
||
#include <sprout/type_traits/enabler_if.hpp>
|
||
#include <sprout/iterator/ptr_index_iterator.hpp>
|
||
#include <sprout/algorithm/find.hpp>
|
||
|
||
namespace sprout {
|
||
namespace detail {
|
||
template<typename T>
|
||
struct memchr_result {
|
||
private:
|
||
static void const* check(void const*);
|
||
static void* check(void*);
|
||
static void check(...);
|
||
public:
|
||
typedef decltype(check(std::declval<T>())) type;
|
||
};
|
||
|
||
template<typename PtrIterator>
|
||
inline SPROUT_CONSTEXPR PtrIterator
|
||
memchr_impl(PtrIterator found, PtrIterator last) {
|
||
return found == last ? nullptr
|
||
: found
|
||
;
|
||
}
|
||
template<typename PtrIterator, typename T>
|
||
inline SPROUT_CONSTEXPR PtrIterator
|
||
memchr(PtrIterator s, T c, std::size_t n) {
|
||
return sprout::detail::memchr_impl(
|
||
sprout::ptr_unindex(
|
||
sprout::find(
|
||
sprout::ptr_index(s), sprout::ptr_index(s, n),
|
||
c
|
||
)
|
||
),
|
||
s + n
|
||
);
|
||
}
|
||
} // namespace detail
|
||
|
||
// 7.21.5.1 memchr ŠÖ<C5A0>”
|
||
//
|
||
// recursion depth:
|
||
// O(log N)
|
||
//
|
||
#if 0
|
||
inline SPROUT_CONSTEXPR void const*
|
||
memchr(void const* s, int c, std::size_t n) {
|
||
return sprout::detail::memchr(static_cast<unsigned char const*>(s), static_cast<unsigned char>(c), n);
|
||
}
|
||
|
||
inline SPROUT_CONSTEXPR void*
|
||
memchr(void* s, int c, std::size_t n) {
|
||
return sprout::detail::memchr(static_cast<unsigned char*>(s), static_cast<unsigned char>(c), n);
|
||
}
|
||
#endif
|
||
template<
|
||
typename T,
|
||
typename sprout::enabler_if<std::is_same<typename sprout::detail::memchr_result<T>::type, void const*>::value>::type = sprout::enabler
|
||
>
|
||
inline SPROUT_CONSTEXPR void const*
|
||
memchr(T s, int c, std::size_t n) {
|
||
return sprout::detail::memchr(static_cast<unsigned char const*>(s), static_cast<unsigned char>(c), n);
|
||
}
|
||
|
||
template<
|
||
typename T,
|
||
typename sprout::enabler_if<std::is_same<typename sprout::detail::memchr_result<T>::type, void*>::value>::type = sprout::enabler
|
||
>
|
||
inline SPROUT_CONSTEXPR void*
|
||
memchr(T s, int c, std::size_t n) {
|
||
return sprout::detail::memchr(static_cast<unsigned char*>(s), static_cast<unsigned char>(c), n);
|
||
}
|
||
} // namespace sprout
|
||
|
||
#endif // #ifndef SPROUT_CSTRING_MEMCHR_HPP
|