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https://github.com/bolero-MURAKAMI/Sprout.git
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53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
#ifndef SPROUT_MATH_FLOAT_SIG_EXP_HPP
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#define SPROUT_MATH_FLOAT_SIG_EXP_HPP
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#include <limits>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/math/detail/config.hpp>
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#include <sprout/detail/pow.hpp>
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#include <sprout/math/float_exponent.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/utility/pair/pair.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 T>
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inline SPROUT_CONSTEXPR sprout::pair<T, int>
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float_sig_exp_impl(T x, int exp) {
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typedef sprout::pair<T, int> type;
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return x == 0 ? type(T(0), exp)
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: x == std::numeric_limits<T>::infinity() ? type(std::numeric_limits<T>::infinity(), exp)
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: x == -std::numeric_limits<T>::infinity() ? type(-std::numeric_limits<T>::infinity(), exp)
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: x == std::numeric_limits<T>::quiet_NaN() ? type(std::numeric_limits<T>::quiet_NaN(), exp)
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: type(x / sprout::detail::pow_n(T(std::numeric_limits<T>::radix), exp), exp)
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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 sprout::pair<FloatType, int>
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float_sig_exp(FloatType x) {
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return sprout::math::detail::float_sig_exp_impl(x, sprout::float_exponent(x));
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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 sprout::pair<double, int>
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float_sig_exp(IntType x) {
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return sprout::math::detail::float_sig_exp(static_cast<double>(x));
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}
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} // namespace detail
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using sprout::math::detail::float_sig_exp;
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} // namespace math
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using sprout::math::float_sig_exp;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_FLOAT_SIG_EXP_HPP
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