mirror/Sprout
1
0
Fork 0
mirror of https://github.com/bolero-MURAKAMI/Sprout.git synced 2025-07-16 15:14:13 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

add lround, llround

Browse source
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
Download patch file Download diff file Expand all files Collapse all files

55
sprout/math/lround.hpp Normal file
View file

@ -0,0 +1,55 @@
#ifndef SPROUT_MATH_LROUND_HPP
#define SPROUT_MATH_LROUND_HPP
#include <limits>
#include <type_traits>
#include <stdexcept>
#include <sprout/config.hpp>
#include <sprout/math/detail/config.hpp>
#include <sprout/type_traits/enabler_if.hpp>
namespace sprout {
namespace math {
namespace detail {
template<typename FloatType>
inline SPROUT_CONSTEXPR long
lround_impl_positive(FloatType x, long x0) {
return x - x0 < FloatType(0.5) ? x0
: x0 + 1
;
}
template<typename FloatType>
inline SPROUT_CONSTEXPR long
lround_impl_nagative(FloatType x, long x0) {
return x0 - x < FloatType(0.5) ? x0
: x0 - 1
;
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR long
lround(FloatType x) {
return x < 0 ? sprout::math::detail::lround_impl_nagative(x, static_cast<long>(x))
: sprout::math::detail::lround_impl_positive(x, static_cast<long>(x))
;
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR long
lround(IntType x) {
return static_cast<long>(x);
}
} // namespacedetailmath
using NS_SPROUT_MATH_DETAIL::lround;
} // namespace math
using sprout::math::lround;
} // namespace sprout
#endif // #ifndef SPROUT_MATH_LROUND_HPP