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191867afe0
I think that sprout::math::is_odd(-1) should be true. It also fixes math::pow for a case that x is a negative and y is a negative odd integer. cf. http://melpon.org/wandbox/permlink/XVKea2I6CdVJCbZX
44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2014 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_IS_ODD_HPP
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#define SPROUT_MATH_IS_ODD_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/math/isfinite.hpp>
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#include <sprout/math/fmod.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 bool
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is_odd_unchecked(T x) {
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return sprout::math::fmod(x, T(2)) == T(1);
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}
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} // namespace detail
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//
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// is_odd
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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 bool
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is_odd(FloatType x) {
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return sprout::math::isfinite(x)
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&& sprout::math::detail::is_odd_unchecked(x < 0 ? -x : x)
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;
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}
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} // namespace math
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using sprout::math::is_odd;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_IS_ODD_HPP
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