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++
/*=============================================================================
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Copyright (c) 2011-2018 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_CSTRING_MEMCHR_HPP
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#define SPROUT_CSTRING_MEMCHR_HPP
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#include <type_traits>
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#include <utility>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/iterator/ptr_index_iterator.hpp>
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#include <sprout/algorithm/find.hpp>
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namespace sprout {
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namespace detail {
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template<typename T>
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struct memchr_result {
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private:
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static void const* test(void const*);
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static void* test(void*);
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static void test(...);
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public:
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typedef decltype(test(std::declval<T>())) type;
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};
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template<typename PtrIterator>
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inline SPROUT_CONSTEXPR PtrIterator
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memchr_impl(PtrIterator found, PtrIterator last) {
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return found == last ? nullptr
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: found
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;
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}
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template<typename PtrIterator, typename T>
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inline SPROUT_CONSTEXPR PtrIterator
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memchr(PtrIterator s, T c, std::size_t n) {
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return sprout::detail::memchr_impl(
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sprout::ptr_unindex(
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sprout::find(
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sprout::ptr_index(s), sprout::ptr_index(s, n),
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c
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)
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),
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s + n
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);
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}
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} // namespace detail
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// 7.21.5.1 memchr function
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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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#if 0
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inline SPROUT_CONSTEXPR void const*
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memchr(void const* s, int c, std::size_t n) {
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return sprout::detail::memchr(static_cast<unsigned char const*>(s), static_cast<unsigned char>(c), n);
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}
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inline SPROUT_CONSTEXPR void*
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memchr(void* s, int c, std::size_t n) {
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return sprout::detail::memchr(static_cast<unsigned char*>(s), static_cast<unsigned char>(c), n);
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}
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#endif
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template<
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typename T,
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typename sprout::enabler_if<std::is_same<typename sprout::detail::memchr_result<T>::type, void const*>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR void const*
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memchr(T s, int c, std::size_t n) {
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return sprout::detail::memchr(static_cast<unsigned char const*>(s), static_cast<unsigned char>(c), n);
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}
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template<
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typename T,
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typename sprout::enabler_if<std::is_same<typename sprout::detail::memchr_result<T>::type, void*>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR void*
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memchr(T s, int c, std::size_t n) {
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return sprout::detail::memchr(static_cast<unsigned char*>(s), static_cast<unsigned char>(c), n);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_CSTRING_MEMCHR_HPP
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