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add c++1y rightmost bit manipurations

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bolero-MURAKAMI 2014-03-31 17:18:22 +09:00
parent 56c9d52436
commit e244ea2932
21 changed files with 560 additions and 183 deletions
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51
sprout/bit/parity.hpp Normal file
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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_BIT_PARITY_HPP
#define SPROUT_BIT_PARITY_HPP
#include <climits>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/bit/popcount.hpp>
namespace sprout {
namespace detail {
# if SPROUT_USE_BUILTIN_BIT_OPERATION
inline SPROUT_CONSTEXPR int
parity(unsigned x) {
return __builtin_parity(x);
}
inline SPROUT_CONSTEXPR int
parity(unsigned long x) {
return __builtin_parityl(x);
}
inline SPROUT_CONSTEXPR int
parity(unsigned long long x) {
return __builtin_parityll(x);
}
# endif
template<typename Integral>
inline SPROUT_CONSTEXPR int
parity(Integral x) {
return sprout::popcount(x) & 1;
}
} // namespace detail
//
// parity
//
template<typename Integral>
inline SPROUT_CONSTEXPR typename std::enable_if<
std::is_integral<Integral>::value,
int
>::type
parity(Integral x) {
return sprout::detail::parity(x);
}
} // namespace sprout
#endif // #ifndef SPROUT_BIT_PARITY_HPP