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add C++1y bit operations (partial)

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This commit is contained in:
bolero-MURAKAMI 2014-03-31 14:58:24 +09:00
parent 1bb9336d34
commit 56c9d52436
17 changed files with 435 additions and 67 deletions
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46
sprout/bit/ctz.hpp
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@ -8,6 +8,7 @@
#ifndef SPROUT_BIT_CTZ_HPP
#define SPROUT_BIT_CTZ_HPP
#include <climits>
#include <type_traits>
#include <sprout/config.hpp>
@ -15,47 +16,54 @@ namespace sprout {
namespace detail {
# if SPROUT_USE_BUILTIN_BIT_OPERATION
inline SPROUT_CONSTEXPR int
ctz(unsigned n) {
return __builtin_ctz(n);
ctz_non0(unsigned x) {
return __builtin_ctz(x);
}
inline SPROUT_CONSTEXPR int
ctz(unsigned long n) {
return __builtin_ctzl(n);
ctz_non0(unsigned long x) {
return __builtin_ctzl(x);
}
inline SPROUT_CONSTEXPR int
ctz(unsigned long long n) {
return __builtin_ctzll(n);
ctz_non0(unsigned long long x) {
return __builtin_ctzll(x);
}
# endif
template<typename T>
template<typename Integral>
inline SPROUT_CONSTEXPR typename std::enable_if<
std::is_unsigned<T>::value,
std::is_unsigned<Integral>::value,
int
>::type
ctz(T n) {
return n & 1 ? 0
: 1 + sprout::detail::ctz(static_cast<T>(n >> 1))
ctz_non0(Integral x) {
return x & 1 ? 0
: 1 + sprout::detail::ctz_non0(static_cast<Integral>(x >> 1))
;
}
template<typename T>
template<typename Integral>
inline SPROUT_CONSTEXPR typename std::enable_if<
std::is_signed<T>::value,
std::is_signed<Integral>::value,
int
>::type
ctz(T n) {
return sprout::detail::ctz(static_cast<typename std::make_unsigned<T>::type>(n));
ctz_non0(Integral x) {
return sprout::detail::ctz_non0(static_cast<typename std::make_unsigned<Integral>::type>(x));
}
template<typename Integral>
inline SPROUT_CONSTEXPR int
ctz(Integral x) {
return x == 0 ? static_cast<int>(sizeof(x) * CHAR_BIT)
: sprout::detail::ctz_non0(x)
;
}
} // namespace detail
//
// ctz
//
template<typename T>
template<typename Integral>
inline SPROUT_CONSTEXPR typename std::enable_if<
std::is_integral<T>::value,
std::is_integral<Integral>::value,
int
>::type
ctz(T n) {
return sprout::detail::ctz(n);
ctz(Integral x) {
return sprout::detail::ctz(x);
}
} // namespace sprout