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# DispatchPredicate

Logical conditions to evaluate within a given execution context.

```
enum DispatchPredicate
```

## Overview

You use dispatch predicates with the [`dispatchPrecondition(condition:)`](/documentation/Dispatch/dispatchPrecondition(condition:)) method.

## Topics

### Predicates

[`DispatchPredicate.onQueue(_:)`](/documentation/Dispatch/DispatchPredicate/onQueue(_:))

A predicate that indicates the evaluated context is the associated dispatch queue.

[`DispatchPredicate.onQueueAsBarrier(_:)`](/documentation/Dispatch/DispatchPredicate/onQueueAsBarrier(_:))

A predicate that indicates the evaluated context is the associated dispatch queue as part of a barrier operation.

[`DispatchPredicate.notOnQueue(_:)`](/documentation/Dispatch/DispatchPredicate/notOnQueue(_:))

A predicate that indicates the evaluated context is not the associated dispatch queue.


---

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