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https://github.com/bolero-MURAKAMI/Sprout.git
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47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 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_STRNCMP_HPP
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#define SPROUT_CSTRING_STRNCMP_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/iterator/ptr_index_iterator.hpp>
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#include <sprout/type_traits/is_char_type.hpp>
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#include <sprout/algorithm/tristate_lexicographical_compare.hpp>
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namespace sprout {
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// 7.21.4.4 strncmp 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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inline SPROUT_CONSTEXPR int
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strncmp(char const* s1, char const* 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), '\0',
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sprout::ptr_index(s2), sprout::ptr_index(s2, n), '\0'
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);
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}
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template<typename Elem>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sprout::is_char_type<Elem>::value,
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int
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>::type
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strncmp(Elem* s1, Elem* s2, std::size_t n) {
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typedef typename std::decay<Elem>::type type;
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return sprout::tristate_lexicographical_compare(
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sprout::ptr_index(s1), sprout::ptr_index(s1, n), type(),
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sprout::ptr_index(s2), sprout::ptr_index(s2, n), type()
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);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_CSTRING_STRNCMP_HPP
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