mp_units::get_standard_uncertainty

Returns the standard uncertainty of a measured constant

Synopsis

Declared in <mp-units/framework/unit_definitions.h>

template<MeasuredConstant U>
[[nodiscard]] consteval Unit auto get_standard_uncertainty(U u);

Description

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.

Return Value

the standard uncertainty of a measured constant

Note

The return value should not be discarded.