/// - lhs: The first value to add.

/// - rhs: The second value to add.

static func += (lhs: inout Measurement, rhs: Measurement) {

lhs = lhs + rhs

}

/// SwifterSwift: Subtracts the second value from the first and stores the difference in the left-hand-side variable.

/// - Parameters:

/// - lhs: A `Measurement` value.

/// - rhs: The value to subtract from `lhs`.

static func -= (lhs: inout Measurement, rhs: Measurement) {

lhs = lhs - rhs

}

/// SwifterSwift: Multiplies two values and stores the result in the left-hand-side variable.

/// - Parameters:

/// - lhs: The first value to multiply.

/// - rhs: The second value to multiply.

static func *= (lhs: inout Measurement, rhs: Double) {

lhs = lhs * rhs

}

/// SwifterSwift: Divides the first value by the second and stores the quotient in the left-hand-side variable.

/// - Parameters:

/// - lhs: The value to divide.

/// - rhs: The value to divide `lhs` by. `rhs` must not be zero.

static func /= (lhs: inout Measurement, rhs: Double) {

lhs = lhs / rhs

}