mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 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_MEMCMP_HPP
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#define SPROUT_CSTRING_MEMCMP_HPP
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#include <type_traits>
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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/tristate_lexicographical_compare.hpp>
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namespace sprout {
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namespace detail {
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template<typename PtrIterator>
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inline SPROUT_CONSTEXPR int
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memcmp(PtrIterator s1, PtrIterator s2, std::size_t n) {
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return sprout::tristate_lexicographical_compare(
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sprout::ptr_index(s1), sprout::ptr_index(s1, n),
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sprout::ptr_index(s2), sprout::ptr_index(s2, n)
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);
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}
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} // namespace detail
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// 7.21.4.1 memcmp function
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//
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// recursion depth:
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// O(log(N1+N2))
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//
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#if 0
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inline SPROUT_CONSTEXPR int
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memcmp(void const* s1, void const* s2, std::size_t n) {
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return sprout::detail::memcmp(static_cast<unsigned char const*>(s1), static_cast<unsigned char const*>(s2), 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_convertible<T, void const*>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR int
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memcmp(T s1, T s2, std::size_t n) {
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return sprout::detail::memcmp(static_cast<unsigned char const*>(s1), static_cast<unsigned char const*>(s2), n);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_CSTRING_MEMCMP_HPP
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