mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
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#ifndef SPROUT_MATH_EQUAL_TO_HPP
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#define SPROUT_MATH_EQUAL_TO_HPP
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#include <limits>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/algorithm/max.hpp>
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#include <sprout/math/abs.hpp>
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#include <sprout/math/float_promote.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<typename T>
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inline SPROUT_CONSTEXPR T
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max3(T x, T y, T z) {
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return sprout::max(sprout::max(x, y), z);
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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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equal_to(FloatType x, FloatType y) {
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return x == y
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|| sprout::abs(x - y)
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<= std::numeric_limits<FloatType>::epsilon() * sprout::math::detail::max3(std::abs(x), std::abs(y), FloatType(1.0))
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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 bool
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equal_to(IntType x, IntType y) {
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return x == y;
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}
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} // namespace detail
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//
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// equal_to
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//
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template<
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typename T1,
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typename T2,
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typename sprout::enabler_if<std::is_arithmetic<T1>::value && std::is_arithmetic<T2>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR bool
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equal_to(T1 x, T2 y) {
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typedef typename sprout::math::float_promote<T1, T2>::type promoted;
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return sprout::math::detail::equal_to<promoted>(x, y);
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}
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} // namespace math
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_EQUAL_TO_HPP
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