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Quantity

Quantity is our workhorse type for safely storing quantities of a given unit in some underlying numeric variable.

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We will provide a full-fledged reference for quantities later. For now, here are the basics.

  1. Quantity<U, R> stores a value of numeric type R (called the “Rep”), whose units are the unit type U.

    • Example: Quantity<Meters, double> stores a length in Meters, in a double variable.

  2. We provide “Rep-named aliases” for better ergonomics.

    • Example: QuantityD<Meters> is an alias for Quantity<Meters, double>.

  3. You cannot get values into or out of Quantity without explicitly naming the unit, at the callsite. For full details, see our tutorials, starting with the first: Au 101: Quantity Makers.

Handling temperatures

If you are working with temperatures — in the sense of “what temperature is it?”, rather than “how much did the temperature change?” — you will want to use QuantityPoint instead of Quantity.