overriding

The C++11 FDIS it says If a virtual function is marked with the virt-specifier override and does not override a member function of a base class, the program is ill-formed. [ Example: struct B { virtual void f(int); }; struct D : B { void f(long) override; // error: wrong signature overriding B::f void f(int) override; // OK }; What if B::f would not have been marked virtual? Is the program ill-formed, then? Or is override then to be ignored`. I can not find any handling of this case in the std text. Update 1/2 (merged) I forwarded a request to the C++ Editors to look into things. Thanks

Consider the following snippet: import java.util.*; public class EqualsOverload { public static void main(String[] args) { class Thing { final int x; Thing(int x) { this.x = x; } public int hashCode() { return x; } public boolean equals(Thing other) { return this.x == other.x; } } List<Thing> myThings = Arrays.asList(new Thing(42)); System.out.println(myThings.contains(new Thing(42))); // prints "false" } } Note that contains returns false !!! We seems to have lost our things!! The bug, of course, is the fact that we've accidentally overloaded , instead of overridden , Object.equals(Object) .

I am developing a WP 8.1 XAML app. The first page is a login page, the second for example a history page. There will be more pages, but it doesn't matter at the moment. When I press the login button on the login page, the second (history) page appears. If I press the (physical) back button on the history page, it goes back to the login page. But I would like to disable this function. Instead of this I would like when I press the back button a MessageDialog appears and if I press again within a few seconds (for example 3 secs) the app terminates. I tried to find the answer for my questions, but

I don't think this is possible, but if is then I need it :) I have a auto-generated proxy file from the wsdl.exe command line tool by Visual Studio 2008. The proxy output is partial classes. I want to override the default constructor that is generated. I would rather not modify the code since it is auto-generated. I tried making another partial class and redefining the default constructor, but that doesn't work. I then tried using the override and new keywords, but that doesn't work. I know I could inherit from the partial class, but that would mean I'd have to change all of our source code to

I've got a class A , which conforms to Equatable protocol and implements == function. In subclass B I override == with more checks. However, when I do comparison between two arrays of instances of B (which both have type Array<A> ), == for A is invoked. Of course if I change type of both arrays to Array<B> , == for B is invoked. I came up with the following solution: A.swift: internal func ==(lhs: A, rhs: A) -> Bool { if lhs is B && rhs is B { return lhs as! B == rhs as! B } return ... } Which looks really ugly and must be extended for every subclass of A . Is there a way to make sure that ==