The call withUnit(u, unit) constructs a value of quantity from the numerical value u and the unit unit. The numerical value u must have empty unit. The argument unit must be an evaluable String expression (typically a String literal) with valid unit syntax.

The resulting value of quantity is obtained by attaching the unit to to the numerical value u.

The optional argument absoluteValue determines the interpretation of unit offsets, similar to the absoluteValue-annotation. For the default unknown, the unit system provides an interpretation based on the unit, similar to when there is no absoluteValue-annotation for a component declaration.

Using withUnit only attaches translation-time information for the unit handling system, and does not introduce any arithmetic on the numerical value u.