Function
compositionLocalOf
Common
```kotlin
public fun compositionLocalOf(
policy: SnapshotMutationPolicy = structuralEqualityPolicy(),
defaultFactory: () -> T,
): ProvidableCompositionLocal
```
Create a `CompositionLocal` key that can be provided using `CompositionLocalProvider`. Changing
the value provided during recomposition will invalidate the content of `CompositionLocalProvider`
that read the value using `CompositionLocal.current`.
`compositionLocalOf` creates a `ProvidableCompositionLocal` which can be used in a a call to
`CompositionLocalProvider`. Similar to `MutableList` vs. `List`, if the key is made public as
`CompositionLocal` instead of `ProvidableCompositionLocal`, it can be read using
`CompositionLocal.current` but not re-provided.
#### Parameters
| | |
| --- | --- |
| policy | a policy to determine when a `CompositionLocal` is considered changed. See `SnapshotMutationPolicy` for details. |
| defaultFactory | a value factory to supply a value when a value is not provided. This factory is called when no value is provided through a `CompositionLocalProvider` of the caller of the component using `CompositionLocal.current`. If no reasonable default can be provided then consider throwing an exception. |