Forgot to commit ObjectReference which is already used for some time

common/src/commonMain/kotlin/net/dankito/utils/multiplatform/ObjectReference.kt

@@ -0,0 +1,21 @@
+package net.dankito.utils.multiplatform
+
+
+open class ObjectReference<T>(
+    value: T?,
+    open val valueChangedListener: ((T?) -> Unit)? = null
+) {
+
+    open var value: T? = value
+        set(value) {
+            field = value
+
+            valueChangedListener?.invoke(value)
+        }
+
+
+    override fun toString(): String {
+        return "$value"
+    }
+
+}