swift 在Release Build with Whole Module Optimization中对泛型类进行子类化时，不会调用重写函数。 HTTPS：//bugs.swift.or

Posted 2021-05-19

/// A generic class
class Parent<T> {

    func printName() {
        print(self.name())
    }

    func name() -> String {
        return "Parent"
    }

}

/// Subclass of generic class
class Child: Parent<String> {

    /// This method is not being called with Release Build + Whole Module Optimization.
    override func name() -> String {
        return "Child"
    }

}

let child = Child()
child.printName() // expected "Child" but prints "Parent" with Release Build + Whole Module Optimization.