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50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
#ifndef SPROUT_MATH_FLOAT_PROMOTE_HPP
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#define SPROUT_MATH_FLOAT_PROMOTE_HPP
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#include <type_traits>
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#include <sprout/config.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, typename U>
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struct float_promote2
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: public std::conditional<
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(std::is_same<T, long double>::value || std::is_same<U, long double>::value),
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std::common_type<long double>,
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typename std::conditional<
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(std::is_same<T, float>::value && std::is_same<U, float>::value),
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float,
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double
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>
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>::type
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{
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static_assert(std::is_arithmetic<U>::value, "float_promote requires arithmetic type.");
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};
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template<typename Current, typename Head, typename... Tail>
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struct float_promote_impl
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: public sprout::math::detail::float_promote_impl<
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typename sprout::math::detail::float_promote2<Current, Head>::type,
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Tail...
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>
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{};
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template<typename Current, typename Head>
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struct float_promote_impl<Current, Head>
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: public sprout::math::detail::float_promote2<Current, Head>
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{};
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} // namespace detail
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//
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// float_promote
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//
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template<typename... Types>
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struct float_promote
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: public sprout::math::detail::float_promote_impl<
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float, typename std::remove_cv<Types>::type...
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>
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{};
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} // namespace math
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_FLOAT_PROMOTE_HPP
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