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Numeric traitsΒΆDefined in header <Kokkos_NumericTraits.hpp> which is included from <Kokkos_Core.hpp>
Provides a replacement for numeric_limits from the standard library header <limits>. Implements a new facility that is being added to the C++23 standard library and that breaks the monolithic numeric_limits class template apart into individual trait templates. For details, please refer to P1841.
Numeric traits are defined in the Kokkos::Experimental namespace since Kokkos 3.5
See below the list of available traits.
trait* denotes traits that were added in Kokkos 3.6
trait* denotes traits that were removed in Kokkos 4.0
Numeric distinguished value traits infinity finite_min finite_max epsilon round_error norm_min denorm_min* reciprocal_overflow_threshold* quiet_NaN* signaling_NaN*
Numeric characteristics traits digits digits10 max_digits10 radix min_exponent min_exponent10 max_exponent max_exponent10
Standard library
Kokkos with C++17
std::numeric_limits<Integral>::min()
finite_min_v<Integral>
std::numeric_limits<FloatingPoint>::min()
norm_min_v<FloatingPoint>
std::numeric_limits<Arithmetic>::lowest()
finite_min_v<Arithmetic>
std::numeric_limits<Arithmetic>::max()
finite_max_v<Arithmetic>
std::numeric_limits<FloatingPoint>::epsilon()
epsilon_v<FloatingPoint>
std::numeric_limits<FloatingPoint>::round_error()
round_error_v<FloatingPoint>
std::numeric_limits<FloatingPoint>::infinity()
infinity_v<FloatingPoint>
std::numeric_limits<FloatingPoint>::quiet_NaN()
quiet_NaN_v<FloatingPoint> (since 3.6)
std::numeric_limits<FloatingPoint>::signaling_NaN()
signaling_NaN_v<FloatingPoint> (since 3.6)
std::numeric_limits<FloatingPoint>::denorm_min()
denorm_min_v<FloatingPoint> (since 3.6)
std::numeric_limits<Arithmetic>::digits
digits_v<Arithmetic>
std::numeric_limits<Arithmetic>::digits10
digits10_v<Arithmetic>
std::numeric_limits<FloatingPoint>::max_digits10
max_digits10_v<FloatingPoint>
std::numeric_limits<Arithmetic>::radix
radix_v<Arithmetic>
std::numeric_limits<FloatingPoint>::min_exponent
min_exponent_v<FloatingPoint>
std::numeric_limits<FloatingPoint>::min_exponent10
min_exponent10_v<FloatingPoint>
std::numeric_limits<FloatingPoint>::max_exponent
max_exponent_v<FloatingPoint>
std::numeric_limits<FloatingPoint>::max_exponent10
max_exponent10_v<FloatingPoint>
Individual traits have value member constant that can be used with C++14 (e.g. epsilon<float>::value).
Individual traits are SFINAE-friendly, you can detect value presence/absence.
template <class T>
constexpr auto has_infinity(T)
-> decltype(Kokkos::Experimental::infinity<T>::value, std::true_type{}) {
return {};
}
constexpr std::false_type has_infinity(...) { return {}; }
template <class T>
KOKKOS_FUNCTION constexpr std::enable_if_t<has_infinity(T{}), T>
legacy_std_numeric_limits_infinity() {
return Kokkos::Experimental::infinity<T>::value;
}
template <class T>
KOKKOS_FUNCTION constexpr std::enable_if_t<!has_infinity(T{}), T>
legacy_std_numeric_limits_infinity() {
return T();
}
See also
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