mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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74 lines
2.4 KiB
C++
74 lines
2.4 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_EQUAL_TO_HPP
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#define SPROUT_MATH_EQUAL_TO_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/limits.hpp>
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#include <sprout/algorithm/detail/max.hpp>
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#include <sprout/math/fabs.hpp>
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#include <sprout/type_traits/arithmetic_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<typename FloatType>
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inline SPROUT_CONSTEXPR bool
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equal_to_impl(FloatType x, FloatType y) {
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return x == y
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|| sprout::fabs(x - y)
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<= sprout::numeric_limits<FloatType>::epsilon() * sprout::math::detail::max3(sprout::fabs(x), sprout::fabs(y), FloatType(1))
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;
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}
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template<
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typename FloatType1, typename FloatType2,
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typename sprout::enabler_if<
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std::is_floating_point<typename sprout::arithmetic_promote<FloatType1, FloatType2>::type>::value
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>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR bool
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equal_to(FloatType1 x, FloatType2 y) {
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typedef typename sprout::arithmetic_promote<FloatType1, FloatType2>::type type;
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return sprout::math::detail::equal_to_impl<type>(x, y);
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}
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template<
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typename IntType1, typename IntType2,
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typename sprout::enabler_if<
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std::is_integral<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::value
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>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR bool
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equal_to(IntType1 x, IntType2 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 T, typename U,
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typename sprout::enabler_if<std::is_arithmetic<T>::value && std::is_arithmetic<U>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR bool
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equal_to(T x, U y) {
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return sprout::math::detail::equal_to(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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