template<class T>
Magnum::Math::IsUnitless struct new in 2019.10

Whether T is a unitless type.

Equivalent to std::true_type for scalar or vector types that have an unitless underlying type (i.e., not Deg or Rad); std::false_type otherwise. Some math functions such as sqrt() or log() work only with unitless types because the resulting unit couldn't be expressed otherwise.