---
title: "compositionLocalWithHostDefaultOf"
description: "Creates a [ProvidableCompositionLocal] where the default value is resolved by querying the
[LocalHostDefaultProvider] with the given [key].

If a value is provided using [ProvidableCompositionLocal.provides], this behaves identically to a
[CompositionLocal] created with [compositionLocalOf].

When no value is provided, the default value is resolved by querying the
[LocalHostDefaultProvider] currently present in the composition. This mechanism allows the
default value to be determined dynamically by the hosting environment (such as an Android View)
rather than being hardcoded or requiring an explicit provider at the root of the composition.

This effectively acts as a bridge, decoupling the definition of the [CompositionLocal] from the
platform-specific logic required to resolve its default. For example, a
`LocalViewModelStoreOwner` can use this to ask the host for the owner without having a direct
dependency on the Android View system."
type: "function"
---

<div class='type'>Function</div>


<a id='references'></a>
<div class='sourceset sourceset-common'>Common</div>


```kotlin
public fun <T> compositionLocalWithHostDefaultOf(
    key: HostDefaultKey<T>
): ProvidableCompositionLocal<T>
```


Creates a `ProvidableCompositionLocal` where the default value is resolved by querying the
`LocalHostDefaultProvider` with the given `key`.

If a value is provided using `ProvidableCompositionLocal.provides`, this behaves identically to a
`CompositionLocal` created with `compositionLocalOf`.

When no value is provided, the default value is resolved by querying the
`LocalHostDefaultProvider` currently present in the composition. This mechanism allows the
default value to be determined dynamically by the hosting environment (such as an Android View)
rather than being hardcoded or requiring an explicit provider at the root of the composition.

This effectively acts as a bridge, decoupling the definition of the `CompositionLocal` from the
platform-specific logic required to resolve its default. For example, a
`LocalViewModelStoreOwner` can use this to ask the host for the owner without having a direct
dependency on the Android View system.

#### Parameters

| | |
| --- | --- |
| key | An opaque key used to identify the requested value within the host's context. The type and meaning of the key are defined by the `HostDefaultProvider` implementation (e.g., on Android, this is typically a Resource ID). |