Container covariance in C++

Question

I know that C++ doesn\'t support covariance for containers elements, as in Java or C#. So the following code probably is undefined behavior:

#include 

        

Answer 1

You are invoking the bad spirit of reinterpret_cast<>.

Unless you really know what you do (I mean not proudly and not pedantically) reinterpret_cast is one of the gates of evil.

The only safe use I know of is managing classes and structures between C++ and C functions calls. There maybe some others however.