Operator

# -(_:_:)

Returns the result of subtracting one demand from another.

## Discussion

When subtracting any value (including `unlimited`) from `unlimited`, the result is still `unlimited`. Subtracting `unlimited` from any value (except `unlimited`) results in `.max(0)`.

A negative demand is possible, but be aware that it is not usable when requesting values in a subscription.

### Performing Mathematical Operations

`static func * (Subscribers.Demand, Int) -> Subscribers.Demand`

Returns the result of multiplying a demand by an integer.

`static func *= (inout Subscribers.Demand, Int)`

Multiplies a demand by an integer, and assigns the result to the demand.

`static func + (Subscribers.Demand, Int) -> Subscribers.Demand`

Returns the result of adding an integer to a demand.

`static func += (inout Subscribers.Demand, Subscribers.Demand)`

Adds two demands, and assigns the result to the first demand.

`static func += (inout Subscribers.Demand, Int)`

Adds an integer to a demand, and assigns the result to the demand.

`static func - (Subscribers.Demand, Int) -> Subscribers.Demand`

Returns the result of subtracting an integer from a demand.

`static func -= (inout Subscribers.Demand, Subscribers.Demand)`

Subtracts one demand from another, and assigns the result to the first demand.

`static func -= (inout Subscribers.Demand, Int)`

Subtracts an integer from a demand, and assigns the result to the demand.

`static func ... (Subscribers.Demand) -> PartialRangeFrom<Subscribers.Demand>`

Returns a partial range extending upward from a lower bound.

`static func ... (Subscribers.Demand) -> PartialRangeThrough<Subscribers.Demand>`

Returns a partial range up to, and including, its upper bound.