Sprout/sprout/cstring/memcmp.hpp
2014-01-08 16:48:12 +09:00

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/*=============================================================================
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_MEMCMP_HPP
#define SPROUT_CSTRING_MEMCMP_HPP
#include <cstddef>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include <sprout/iterator/ptr_index_iterator.hpp>
#include <sprout/algorithm/tristate_lexicographical_compare.hpp>
namespace sprout {
// 7.21.4.1 memcmp ŠÖ<C5A0>
//
// recursion depth:
// O(log(N1+N2))
//
#if 0
inline SPROUT_CONSTEXPR int
memcmp(void const* s1, void const* s2, std::size_t n) {
return sprout::tristate_lexicographical_compare(
sprout::ptr_index(static_cast<unsigned char const*>(s1)), sprout::ptr_index(static_cast<unsigned char const*>(s1), n),
sprout::ptr_index(static_cast<unsigned char const*>(s2)), sprout::ptr_index(static_cast<unsigned char const*>(s2), n)
);
}
#endif
template<
typename T,
typename sprout::enabler_if<std::is_convertible<T, void const*>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR int
memcmp(T s1, T s2, std::size_t n) {
return sprout::tristate_lexicographical_compare(
sprout::ptr_index(static_cast<unsigned char const*>(s1)), sprout::ptr_index(static_cast<unsigned char const*>(s1), n),
sprout::ptr_index(static_cast<unsigned char const*>(s2)), sprout::ptr_index(static_cast<unsigned char const*>(s2), n)
);
}
} // namespace sprout
#endif // #ifndef SPROUT_CSTRING_MEMCMP_HPP