empty {rstackdeque}

Check if an rstack, rdeque, or rpqueue is empty

Description

Check if an rstack, rdeque, or rpqueue is empty.

Usage

empty(x, ...)

Arguments

x

rstack, rdeque, or rpqueue to check.

...

additional arguments to be passed to or from methods (ignored).

Details

Runs in O(1) time for all types.

Value

logical vector of length 1.

Examples

s <- rstack()
print(empty(s))        ## TRUE
s <- insert_top(s, "a")
print(empty(s))        ## FALSE