Check if an rstack, rdeque, or rpqueue is empty

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Description

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

Usage

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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

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

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