# Quantity

A base interface for quantities. Outlines the common operations to retrieve values and perform mathematical operations.

#### Parameters

__Q__

The quantity type implementing this interface.

__U__

An enum type that contains the units that the quantity's values can be in.

#### Inheritors

## Types

## Functions

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Returns a FormattedQuantity representation of the value from `this`

in the given unit.

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Returns a new instance with the value from `this`

as negative.