---
title: PredicateExpressions.OptionalFlatMap
framework: foundation
role: symbol
role_heading: Structure
path: foundation/predicateexpressions/optionalflatmap
---

# PredicateExpressions.OptionalFlatMap

## Declaration

```swift
struct OptionalFlatMap<LHS, Wrapped, RHS, Result> where LHS : PredicateExpression, RHS : PredicateExpression, LHS.Output == Wrapped?
```

## Topics

### Initializers

- [init(_:_:)](foundation/predicateexpressions/optionalflatmap/init(_:_:)-3sqz7.md)
- [init(_:_:)](foundation/predicateexpressions/optionalflatmap/init(_:_:)-fnq2.md)

### Instance Properties

- [transform](foundation/predicateexpressions/optionalflatmap/transform.md)
- [variable](foundation/predicateexpressions/optionalflatmap/variable.md)
- [wrapped](foundation/predicateexpressions/optionalflatmap/wrapped.md)

## Relationships

### Conforms To

- [Copyable](swift/copyable.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Decodable](swift/decodable.md)
- [Encodable](swift/encodable.md)
- [Escapable](swift/escapable.md)
- [PredicateExpression](foundation/predicateexpression.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)
- [StandardPredicateExpression](foundation/standardpredicateexpression.md)