Returns the standard uncertainty of a measured constant
Declared in <mp-units/framework/unit_definitions.h>
template<MeasuredConstant U>
[[nodiscard]]
consteval
Unit auto
get_standard_uncertainty(U u);The result is a unit expression of the constant's own dimension (constants are units in this library, and so are their uncertainties). For a constant declared with relative_standard_uncertainty, the result is derived by scaling the constant itself (u(x) = u_r * |x|, so the result is positive even for a negative-valued constant).
As for get_relative_standard_uncertainty, there is no valid result for constants that are exact by definition.
the standard uncertainty of a measured constant
The return value should not be discarded.