---
title: "+=(_:_:)"
framework: combine
role: symbol
role_heading: Operator
path: "combine/subscribers/demand/+=(_:_:)-20lis"
---

# +=(_:_:)

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

## Declaration

```swift
static func += (lhs: inout Subscribers.Demand, rhs: Subscribers.Demand)
```

## Discussion

Discussion When adding any value to .unlimited, the result is .unlimited.

## See Also

### Performing mathematical operations

- [*(_:_:)](combine/subscribers/demand/*(_:_:).md)
- [*=(_:_:)](combine/subscribers/demand/*=(_:_:).md)
- [+(_:_:)](combine/subscribers/demand/+(_:_:)-2hdad.md)
- [+(_:_:)](combine/subscribers/demand/+(_:_:)-902we.md)
- [+=(_:_:)](combine/subscribers/demand/+=(_:_:)-3k1hv.md)
- [-(_:_:)](combine/subscribers/demand/-(_:_:)-1r0gm.md)
- [-(_:_:)](combine/subscribers/demand/-(_:_:)-6mw4s.md)
- [-=(_:_:)](combine/subscribers/demand/-=(_:_:)-1d0m9.md)
- [-=(_:_:)](combine/subscribers/demand/-=(_:_:)-9pwnc.md)