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fix float_exponent10 order O(logN)

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This commit is contained in:
bolero-MURAKAMI 2013-12-31 21:26:22 +09:00
parent ef4a7ac1d8
commit be0bc155d8
2 changed files with 75 additions and 7 deletions
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2
sprout/darkroom/renderers/calculate.hpp
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@ -16,7 +16,7 @@ namespace sprout {
namespace darkroom {
namespace renderers {
//
//
// default_depth
//
SPROUT_STATIC_CONSTEXPR std::size_t default_depth = 4;

80
sprout/detail/math/float.hpp
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@ -34,21 +34,89 @@ namespace sprout {
//
// float_exponent10
//
// !!! TODO: O(logN)
template<typename FloatType>
inline SPROUT_CONSTEXPR sprout::pair<int, FloatType>
float_exponent10_positive_1(sprout::pair<int, FloatType> const& current, int n) {
typedef sprout::pair<int, FloatType> type;
return (current.second) < 10 ? current
: n == 1 ? type(current.first + 1, current.second / 10)
: sprout::detail::float_exponent10_positive_1(
sprout::detail::float_exponent10_positive_1(
current,
n / 2
),
n - n / 2
)
;
}
template<typename FloatType>
inline SPROUT_CONSTEXPR sprout::pair<int, FloatType>
float_exponent10_positive_0(sprout::pair<int, FloatType> const& current, int n) {
return (current.second) < 10 ? current
: sprout::detail::float_exponent10_positive_0(
sprout::detail::float_exponent10_positive_1(
current,
n
),
n * 2
)
;
}
template<typename FloatType>
inline SPROUT_CONSTEXPR int
float_exponent10_positive(FloatType val) {
return val < 10 ? 0
: 1 + sprout::detail::float_exponent10_positive(val / 10)
typedef sprout::pair<int, FloatType> type;
return float_exponent10_positive_0(type(val, 0), 1).first;
}
template<typename FloatType>
inline SPROUT_CONSTEXPR sprout::pair<int, FloatType>
float_exponent10_negative_1(sprout::pair<int, FloatType> const& current, int n) {
typedef sprout::pair<int, FloatType> type;
return !((current.second) < 1) ? current
: n == 1 ? type(current.first + 1, current.second * 10)
: sprout::detail::float_exponent10_negative_1(
sprout::detail::float_exponent10_negative_1(
current,
n / 2
),
n - n / 2
)
;
}
template<typename FloatType>
inline SPROUT_CONSTEXPR sprout::pair<int, FloatType>
float_exponent10_negative_0(sprout::pair<int, FloatType> const& current, int n) {
return !((current.second) < 1) ? current
: sprout::detail::float_exponent10_negative_0(
sprout::detail::float_exponent10_negative_1(
current,
n
),
n * 2
)
;
}
template<typename FloatType>
inline SPROUT_CONSTEXPR int
float_exponent10_negative(FloatType val) {
return val < 1 ? 1 + sprout::detail::float_exponent10_negative(val * 10)
: 0
;
typedef sprout::pair<int, FloatType> type;
return float_exponent10_negative_0(type(val, 0), 1).first;
}
// !!! OLD:
// template<typename FloatType>
// inline SPROUT_CONSTEXPR int
// float_exponent10_positive(FloatType val) {
// return val < 10 ? 0
// : 1 + sprout::detail::float_exponent10_positive(val / 10)
// ;
// }
// template<typename FloatType>
// inline SPROUT_CONSTEXPR int
// float_exponent10_negative(FloatType val) {
// return val < 1 ? 1 + sprout::detail::float_exponent10_negative(val * 10)
// : 0
// ;
// }
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler