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add lround, llround

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This commit is contained in:
bolero-MURAKAMI 2012-07-05 08:03:32 +09:00
parent 77f058a34c
commit 36fe60bec3
7 changed files with 140 additions and 28 deletions
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17
sprout/math/round.hpp
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@ -7,6 +7,7 @@
#include <stdexcept>
#include <sprout/config.hpp>
#include <sprout/math/detail/config.hpp>
#include <sprout/math/isinf.hpp>
#include <sprout/type_traits/enabler_if.hpp>
namespace sprout {
@ -15,16 +16,14 @@ namespace sprout {
template<typename FloatType>
inline SPROUT_CONSTEXPR FloatType
round_impl_positive(FloatType x, FloatType x0) {
return x - x0 < FloatType(0.5)
? x0
return x - x0 < FloatType(0.5) ? x0
: x0 + 1
;
}
template<typename FloatType>
inline SPROUT_CONSTEXPR FloatType
round_impl_nagative(FloatType x, FloatType x0) {
return x0 - x < FloatType(0.5)
? x0
return x0 - x < FloatType(0.5) ? x0
: x0 - 1
;
}
@ -34,11 +33,11 @@ namespace sprout {
>
inline SPROUT_CONSTEXPR FloatType
round(FloatType x) {
return std::numeric_limits<std::uintmax_t>::max() < x || std::numeric_limits<std::uintmax_t>::max() < -x
? throw std::domain_error("round: Sorry, not implemented.")
: x < 0
? sprout::math::detail::round_impl_nagative(x, -static_cast<FloatType>(static_cast<std::uintmax_t>(-x)))
: sprout::math::detail::round_impl_positive(x, static_cast<FloatType>(static_cast<std::uintmax_t>(x)))
return sprout::math::isinf(x) ? x
: std::numeric_limits<std::uintmax_t>::max() < x || std::numeric_limits<std::uintmax_t>::max() < -x
? throw std::domain_error("round: Sorry, not implemented.")
: x < 0 ? sprout::math::detail::round_impl_nagative(x, -static_cast<FloatType>(static_cast<std::uintmax_t>(-x)))
: sprout::math::detail::round_impl_positive(x, static_cast<FloatType>(static_cast<std::uintmax_t>(x)))
;
}