Support property delegation to inline class values (KT-27070)

2018-10-01 12:58:39 +03:00
parent 70e60ea9bc
commit 5480bf69e8
18 changed files with 582 additions and 16 deletions
@@ -0,0 +1,36 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+class Foo {
+    var a: Int = 42
+    var d by Delegate(0)
+}
+
+var setterInvoked = 0
+
+inline class Delegate(val default: Int) {
+
+    operator fun getValue(thisRef: Any?, prop: Any?) =
+        (thisRef as? Foo)?.a ?: default
+
+    operator fun setValue(thisRef: Any?, prop: Any?, newValue: Int) {
+        setterInvoked++
+        if (thisRef is Foo) {
+            thisRef.a = newValue
+        }
+    }
+}
+
+
+fun box(): String {
+    val x = Foo()
+    if (x.d != 42) throw AssertionError()
+
+    x.d = 1234
+    if (x.d != 1234) throw AssertionError()
+    if (x.a != 1234) throw AssertionError()
+
+    if (setterInvoked != 1) throw AssertionError()
+
+    return "OK"
+}