Deferring use until after the class is defined.

A strong reference to nothing.

Deadlocking with yourself.

It's just a name, and it comes from the days before user-mode/kernel-mode separation.

There's stuff going on that's hiding behind the innocuous-looking name.

Using what you know about how functions are imported to construct a theory that matches the evidence.

Mapping the generic concept to specific file types.

You forgot to include the namespace header file, didn't you.

Trying to look like somebody else.

They go all over the place.