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https://github.com/bolero-MURAKAMI/Sprout.git
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45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#ifndef SPROUT_MATH_LOG2HPP
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#define SPROUT_MATH_LOG2HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/math/log.hpp>
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#include <sprout/math/constants.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
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# include <cmath>
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#endif
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namespace sprout {
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namespace math {
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namespace detail {
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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 FloatType
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log2(FloatType x) {
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return sprout::math::log(x) / sprout::math::ln_two<FloatType>();
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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 double
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log2(IntType x) {
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return sprout::math::detail::log2(static_cast<double>(x));
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}
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} // namespace detail
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# if SPROUT_USE_BUILTIN_CMATH_FUNCTION
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using std::log2;
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# else
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using sprout::math::detail::log2;
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# endif
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} // namespace math
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using sprout::math::log2;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_LOG2HPP
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