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dataconnect: relax variance of the NullableReference type parameter to covariant (was invariant) #6511

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merged 2 commits into from
Nov 13, 2024
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dataconnect: relax variance of the NullableReference type parameter to covariant (was invariant) #6511

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NullableReference.kt: relax variance of the type parameter from invar…
dconeybe Nov 13, 2024
a161e3d
NullableReference.kt: add class kdoc comments
dconeybe Nov 13, 2024
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7 changes: 6 additions & 1 deletion ...ase-dataconnect/src/main/kotlin/com/google/firebase/dataconnect/util/NullableReference.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,12 @@
*/
package com.google.firebase.dataconnect.util

internal class NullableReference<T>(val ref: T? = null) {
/**
* A class that simply wraps a reference to another object, possibly a null reference. Instances of
* this class can be useful for the case where the meaning of `null` is overloaded, such as
* [kotlinx.coroutines.flow.MutableStateFlow.compareAndSet].
*/
internal class NullableReference<out T>(val ref: T? = null) {
override fun equals(other: Any?) = (other is NullableReference<*>) && other.ref == ref
override fun hashCode() = ref?.hashCode() ?: 0
override fun toString() = ref?.toString() ?: "null"
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