---
title: ComposedTransformer
framework: createmlcomponents
role: symbol
role_heading: Structure
path: createmlcomponents/composedtransformer
---

# ComposedTransformer

A transformer that composes two transformers by applying them one after the other.

## Declaration

```swift
struct ComposedTransformer<Inner, Outer> where Inner : Transformer, Outer : Transformer, Inner.Output == Outer.Input
```

## Overview

Overview The inner transformer’s output must match the outer transformer input. The result of this transformer is equivalent to invoking outer(inner(x)) on an input x,

## Topics

### Creating the transformer

- [init(_:_:)](createmlcomponents/composedtransformer/init(_:_:).md)

### Getting the properties

- [inner](createmlcomponents/composedtransformer/inner.md)
- [outer](createmlcomponents/composedtransformer/outer.md)

### Performing the transformation

- [applied(to:eventHandler:)](createmlcomponents/composedtransformer/applied(to:eventhandler:).md)
- [ComposedTransformer.Input](createmlcomponents/composedtransformer/input.md)
- [ComposedTransformer.Intermediate](createmlcomponents/composedtransformer/intermediate.md)
- [ComposedTransformer.Output](createmlcomponents/composedtransformer/output.md)

## Relationships

### Conforms To

- [Copyable](swift/copyable.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [Decodable](swift/decodable.md)
- [Encodable](swift/encodable.md)
- [Equatable](swift/equatable.md)
- [Escapable](swift/escapable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)
- [Transformer](createmlcomponents/transformer.md)

## See Also

### Composition

- [ComposedTemporalTransformer](createmlcomponents/composedtemporaltransformer.md)
- [ComposedTabularTransformer](createmlcomponents/composedtabulartransformer.md)