This should do what you want:
template push(val: int) =
stack[p] = val
p.inc()
template pop(): int =
p.dec()
stack[p]
Run
The relevant point isn't the stack logic (p++ vs p--) but that a template that
is supposed to "return" something is supposed to have that something - in this
case `stack[p]` \- as _last_ expression. So in your pop() version the template
were to "return" the decremented `p` (if it could).
You could make it work however if you changed it to:
template POP =
let v = stack[p]; dec p; v
Run
Side note: in Nim identifiers that start with a capital letter are supposed to
be types, so "PUSH" and "POP" while being typical for C are a poor choice in
Nim.
