Check if an rstack, rdeque, or rpqueue is empty.
rstack, rdeque, or rpqueue to check.
additional arguments to be passed to or from methods (ignored).
Runs in O(1) time for all types.
logical vector of length 1.
s <- rstack()
print(empty(s)) ## TRUE
s <- insert_top(s, "a")
print(empty(s)) ## FALSE
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