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add sprout::math::float_promote

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bolero-MURAKAMI 2012-05-05 17:35:33 +09:00
parent 2fb6cea457
commit feba220da4
3 changed files with 61 additions and 82 deletions
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55
sprout/math/float_promote.hpp Normal file
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#ifndef SPROUT_MATH_FLOAT_PROMOTE_HPP
#define SPROUT_MATH_FLOAT_PROMOTE_HPP
#include <type_traits>
#include <sprout/config.hpp>
namespace sprout {
namespace math {
namespace detail {
template<bool IsArithmetic, typename Current, typename Head, typename... Tail>
struct float_promote_impl {};
template<typename Current, typename Head>
struct float_promote_impl<true, Current, Head>
: public std::conditional<
(std::is_same<Current, long double>::value || std::is_same<Head, long double>::value),
long double,
double
>
{};
template<typename Current, typename Head, typename... Tail>
struct float_promote_impl<true, Current, Head, Tail...>
: public sprout::math::detail::float_promote_impl<
std::is_arithmetic<Head>::value,
typename std::conditional<
(std::is_same<Current, long double>::value || std::is_same<Head, long double>::value),
long double,
double
>::type,
Tail...
>
{};
template<typename Head, typename... Tail>
struct float_promote
: public sprout::math::detail::float_promote_impl<
std::is_arithmetic<Head>::value,
double,
Head, Tail...
>
{};
} // namespace detail
//
// float_promote
//
template<typename... Types>
struct float_promote
: public sprout::math::detail::float_promote<
typename std::remove_cv<Types>::type...
>
{};
} // namespace math
} // namespace sprout
#endif // #ifndef SPROUT_MATH_FLOAT_PROMOTE_HPP