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add sprout::math::float_promote

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This commit is contained in:
bolero-MURAKAMI 2012-05-05 17:35:33 +09:00
parent 2fb6cea457
commit feba220da4
3 changed files with 61 additions and 82 deletions
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44
sprout/math/pow.hpp
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@ -6,6 +6,7 @@
#include <sprout/math/exp.hpp>
#include <sprout/math/log.hpp>
#include <sprout/math/constants.hpp>
#include <sprout/math/float_promote.hpp>
#include <sprout/utility/enabler_if.hpp>
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
# include <cmath>
@ -13,45 +14,6 @@
namespace sprout {
namespace math {
namespace detail {
template<typename X, typename Y, typename Enable = void>
struct pow_promoted {};
template<typename X, typename Y>
struct pow_promoted<
X,
Y,
typename std::enable_if<
std::is_arithmetic<X>::value && std::is_arithmetic<Y>::value
&& (std::is_same<X, long double>::value || std::is_same<Y, long double>::value)
>::type
> {
public:
typedef long double type;
};
template<typename X, typename Y>
struct pow_promoted<
X,
Y,
typename std::enable_if<
std::is_arithmetic<X>::value && std::is_arithmetic<Y>::value
&& !(std::is_same<X, long double>::value || std::is_same<Y, long double>::value)
>::type
> {
public:
typedef double type;
};
} // namespace detail
//
// pow_promoted
//
template<typename X, typename Y>
struct pow_promoted
: public sprout::math::detail::pow_promoted<
typename std::remove_cv<X>::type,
typename std::remove_cv<Y>::type
>
{};
namespace detail {
template<
typename FloatType,
@ -69,9 +31,9 @@ namespace sprout {
std::is_arithmetic<ArithmeticType1>::value && std::is_arithmetic<ArithmeticType2>::value
>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR typename sprout::math::pow_promoted<ArithmeticType1, ArithmeticType2>::type
inline SPROUT_CONSTEXPR typename sprout::math::float_promote<ArithmeticType1, ArithmeticType2>::type
pow(ArithmeticType1 x, ArithmeticType2 y) {
typedef typename sprout::math::pow_promoted<ArithmeticType1, ArithmeticType2>::type type;
typedef typename sprout::math::float_promote<ArithmeticType1, ArithmeticType2>::type type;
return sprout::math::detail::pow(static_cast<type>(x), static_cast<type>(y));
}
} // namespace detail