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https://github.com/bolero-MURAKAMI/Sprout.git
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72 lines
2 KiB
C++
72 lines
2 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2013 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_MATH_ILOGB_HPP
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#define SPROUT_MATH_ILOGB_HPP
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#include <climits>
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#include <cfloat>
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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/logb.hpp>
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#include <sprout/math/isnan.hpp>
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#include <sprout/math/isinf.hpp>
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#include <sprout/math/iszero.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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#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
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inline SPROUT_CONSTEXPR int
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builtin_ilogb(float x) {
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return __builtin_ilogbf(x);
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}
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inline SPROUT_CONSTEXPR int
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builtin_ilogb(double x) {
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return __builtin_ilogb(x);
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}
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inline SPROUT_CONSTEXPR int
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builtin_ilogb(long double x) {
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return __builtin_ilogbl(x);
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}
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#endif
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} // namespace detail
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//
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// ilogb
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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 int
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ilogb(FloatType x) {
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return sprout::math::iszero(x) ? FP_ILOGB0
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: sprout::math::isinf(x) ? INT_MAX
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: sprout::math::isnan(x) ? FP_ILOGBNAN
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#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
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: sprout::math::detail::builtin_ilogb(x)
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#else
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: static_cast<int>(sprout::math::logb(x))
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#endif
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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 int
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ilogb(IntType x) {
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return sprout::math::ilogb(static_cast<double>(x));
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}
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} // namespace math
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using sprout::math::ilogb;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_ILOGB_HPP
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