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add math functions: logb, ilogb

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bolero-MURAKAMI 2013-02-07 18:14:50 +09:00
parent 4b3d4e82d7
commit d05b597e80
13 changed files with 218 additions and 11 deletions
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47
sprout/math/log_a.hpp Normal file
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#ifndef SPROUT_MATH_LOG_A_HPP
#define SPROUT_MATH_LOG_A_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/math/detail/config.hpp>
#include <sprout/math/log.hpp>
#include <sprout/math/constants.hpp>
#include <sprout/type_traits/float_promote.hpp>
#include <sprout/type_traits/enabler_if.hpp>
namespace sprout {
namespace math {
namespace detail {
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
log_a(FloatType x, FloatType y) {
return x == 2 ? sprout::math::log(y) / sprout::math::ln_two<FloatType>()
: x == 10 ? sprout::math::log(y) / sprout::math::ln_ten<FloatType>()
: sprout::math::log(y) / sprout::math::log(x)
;
}
template<
typename ArithmeticType1,
typename ArithmeticType2,
typename sprout::enabler_if<
std::is_arithmetic<ArithmeticType1>::value && std::is_arithmetic<ArithmeticType2>::value
>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type
log_a(ArithmeticType1 x, ArithmeticType2 y) {
typedef typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type type;
return sprout::math::detail::log_a(static_cast<type>(x), static_cast<type>(y));
}
} // namespace detail
using sprout::math::detail::log_a;
} // namespace math
using sprout::math::log_a;
} // namespace sprout
#endif // #ifndef SPROUT_MATH_LOG_A_HPP