c++ sealed and interface

Question

I noticed that there are sealed and interface keywords in C++. Is this just for CLR C++? If not, when were sealed and interface added to the C++ standard? Do they have the same meaning in C++ as they do in C#? If not, how do I get the equivalent in standard C++?

Answer 1

sealed and interface keywords are only for C++/CLI. See Language Features for Targeting the CLR for more details.

In standard C++ interface could be replaced with pure virtual class and multiple inheritance. Sealed keyword could be replaced with boost::noninheritable (which is not an official part of boost yet).

Answer 2

An interface can be duplicated in C++ with a pure virtual class, taking advantage of the fact that you can do multiple inheritance.

sealed can be winged with a private constructor and a sort of factory pattern (to actually obtain instances of the sealed class). There's a couple other examples at the C++ FAQ Lite.