Emrys::RealScalar Concept Reference

A type usable as the scalar of a distribution: a real number type such as float, double, or an automatic-differentiation scalar. More...

#include <EmrysFilter/Core/Math.h>

Concept definition

template<typename T>
concept RealScalar =
    !Eigen::NumTraits<T>::IsInteger && !Eigen::NumTraits<T>::IsComplex && requires(T const & a, T const & b) {
        a + b;
        a - b;
        a * b;
        a / b;
        a < b;
    }

Detailed Description

A type usable as the scalar of a distribution: a real number type such as float, double, or an automatic-differentiation scalar.

Means, covariances, factorizations, and log-weights need real arithmetic, so integer and complex types are excluded. Integer-valued quantities are values in a discrete space, not scalars.