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36 lines
990 B
C++
36 lines
990 B
C++
#ifndef SPROUT_MATH_SIGNBIT_HPP
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#define SPROUT_MATH_SIGNBIT_HPP
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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/math/isnan.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<
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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 bool
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signbit(FloatType x) {
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return !sprout::math::isnan(x) && x < 0;
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}
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} // namespace detail
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//
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// issue:
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// [ !SPROUT_USE_BUILTIN_CMATH_FUNCTION ]
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// signbit(-0) returns false .
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// # returns true . ( same as signbit(+0) )
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// signbit(-NaN) returns false .
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// # returns true . ( same as signbit(+NaN) )
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//
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using NS_SPROUT_MATH_DETAIL::signbit;
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} // namespace math
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using sprout::math::signbit;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_SIGNBIT_HPP
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