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

In rstackdeque: Persistent Fast Amortized Stack and Queue Data Structures

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

rstackdeque documentation built on May 2, 2019, 4:15 a.m.