Implement a generic string->pointer associative array on top of the khash macro
library, providing a nice API for simple hash table requirements. (khash gives
lot of control with a not-so-friendly API, which is unnecessary on most cases)
- Add a new macro to klist.h: kl_empty()
The whole point of abstract data structures is to avoid reimplementing
common actions. The emptiness test seems to be such an action.
- Add a new function attribute to func_attr.h: FUNC_ATTR_UNUSED
Some of the many functions created by the macros in klist.h may end up not
being used. Unused functions cause compilation errors as we compile with
-Werror. To mark those functions as possibly unused we can use the
FUNC_ATTR_UNUSED now.
- Pass `Event` by value
`Event` is such a small struct that I don't think we should allocate heap space
and pass it by reference. Let's use the stack and memory cache in our favor
passing it by value.
