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https://github.com/bolero-MURAKAMI/Sprout.git
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56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
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#ifndef SPROUT_MATH_LLROUND_HPP
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#define SPROUT_MATH_LLROUND_HPP
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#include <limits>
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#include <type_traits>
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#include <stdexcept>
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#include <sprout/config.hpp>
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#include <sprout/math/detail/config.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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namespace sprout {
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namespace math {
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namespace detail {
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template<typename FloatType>
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inline SPROUT_CONSTEXPR long long
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llround_impl_positive(FloatType x, long long x0) {
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return x - x0 < FloatType(0.5) ? x0
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: x0 + 1
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;
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}
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template<typename FloatType>
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inline SPROUT_CONSTEXPR long long
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llround_impl_nagative(FloatType x, long long x0) {
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return x0 - x < FloatType(0.5) ? x0
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: x0 - 1
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;
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}
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template<
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typename FloatType,
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typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR long long
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llround(FloatType x) {
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return x < 0 ? sprout::math::detail::llround_impl_nagative(x, static_cast<long long>(x))
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: sprout::math::detail::llround_impl_positive(x, static_cast<long long>(x))
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;
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}
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template<
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typename IntType,
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typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR long long
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llround(IntType x) {
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return static_cast<long long>(x);
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}
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} // namespacedetailmath
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using NS_SPROUT_MATH_DETAIL::llround;
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} // namespace math
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using sprout::math::llround;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_LLROUND_HPP
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