Practical Singleton & Dependency Injection question

Question

Say I have a class called PermissionManager which should only exist once for my system and basically fulfills the function of managing various permissions for various actions in

Answer 1

The singleton pattern is not bad by itself, what makes it ugly is the way it's commonly used, as being the requirement of only wanting a single instance of a certain class, which I think it's a big mistake.

In this case I'd make PermissionManager a static class unless for any reason you need it to be an instanciable type.