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fix math::log implementation

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support std::hash
This commit is contained in:
bolero-MURAKAMI 2013-02-07 03:11:17 +09:00
parent 9140b68379
commit 66da9f4fea
20 changed files with 288 additions and 5 deletions
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26
sprout/detail/pow.hpp
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@ -1,7 +1,11 @@
#ifndef SPROUT_DETAIL_POW_HPP
#define SPROUT_DETAIL_POW_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/type_traits/is_int.hpp>
#include <sprout/type_traits/is_uint.hpp>
#include <sprout/type_traits/enabler_if.hpp>
namespace sprout {
namespace detail {
@ -17,21 +21,35 @@ namespace sprout {
return x * x * x;
}
template<typename T>
template<typename T, typename IntType>
inline SPROUT_CONSTEXPR T
pow_n_impl(T const& x, int n) {
pow_n_impl(T const& x, IntType n) {
return n == 1 ? x
: n % 2 ? x * sprout::detail::pow2(sprout::detail::pow_n_impl(x, n / 2))
: sprout::detail::pow2(sprout::detail::pow_n_impl(x, n / 2))
;
}
template<typename T>
template<
typename T, typename UIntType,
typename sprout::enabler_if<sprout::is_uint<UIntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR T
pow_n(T const& x, int n) {
pow_n(T const& x, UIntType n) {
return n == 0 ? T(1)
: sprout::detail::pow_n_impl(x, n)
;
}
template<
typename T, typename IntType,
typename sprout::enabler_if<sprout::is_int<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR T
pow_n(T const& x, IntType n) {
return n == 0 ? T(1)
: n > 0 ? sprout::detail::pow_n_impl(x, n)
: T(1) / sprout::detail::pow_n_impl(x, -n)
;
}
} // namespace detail
} // namespace sprout