Hello,
I wasn’t sure whether to post this message here, at swift-dev, or at
swift-evolution. so I’ll try here first. Hopefully it will get to the right
group of people or, if not, someone will point me to the right mailing list.
I came across a situation that boils down to this example:
class Parent {
func foo() {
print("Parent foo() called")
}
}
class Child: Parent {
func foo(x: Int = 0) {
print("Child foo() called")
}
}
let c = Child()
c.foo() // prints "Parent foo() called"
I understand why this behaves like so, namely, the subclass has a method
foo(x:) but no direct implementation of foo() so the parent’s implementation is
invoked rather than the child's. That’s all fine except that it is not very
intuitive.
I would argue that the expectation is that the search for an implementation
should start with the subclass (which is does) but should look at all possible
restrictions of parent implementations, including the restriction due to
default values.
At the very least, I think the compiler should emit a warning or possibly even
an error.
Thanks for reading.
Cheers,
Wagner
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