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Sprout/sprout/math/ilogb.hpp

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2013-02-07 09:14:50 +00:00
#ifndef SPROUT_MATH_ILOGB_HPP
#define SPROUT_MATH_ILOGB_HPP
#include <climits>
#include <cfloat>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/math/detail/config.hpp>
#include <sprout/math/logb.hpp>
#include <sprout/math/isnan.hpp>
#include <sprout/math/isinf.hpp>
#include <sprout/math/iszero.hpp>
#include <sprout/type_traits/enabler_if.hpp>
namespace sprout {
namespace math {
namespace detail {
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR int
ilogb(FloatType x) {
return sprout::math::iszero(x) ? FP_ILOGB0
: sprout::math::isinf(x) ? INT_MAX
: sprout::math::isnan(x) ? FP_ILOGBNAN
: static_cast<int>(sprout::math::logb(x))
;
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR int
ilogb(IntType x) {
return sprout::math::detail::ilogb(static_cast<double>(x));
}
} // namespace detail
using NS_SPROUT_MATH_DETAIL::ilogb;
} // namespace math
using sprout::math::ilogb;
} // namespace sprout
#endif // #ifndef SPROUT_MATH_ILOGB_HPP