container/memo.go

@@ -20,7 +20,6 @@ func NewMemo[T any] (update func () T) Memo[T] {
 func (this *Memo[T]) Value () T {
 	if !this.valid {
 		this.cache = this.update()
-		this.valid = true
 	}
 	return this.cache
 }
@@ -28,8 +27,13 @@ func (this *Memo[T]) Value () T {
 // Invalidate marks the Memo's value as invalid, which will cause it to be
 // updated the next time Value is called.
 func (this *Memo[T]) Invalidate () {
-	var zero T
-	this.cache = zero
 	this.valid = false
 }
 
+// InvalidateTo invalidates the Memo and sets its value. The new value will be
+// entirely inaccessible. This is only intended to be used for setting a
+// reference to nil
+func (this *Memo[T]) InvalidateTo (value T) {
+	this.Invalidate()
+	this.cache = value
+}