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#' @export
#' @title Check if an rstack, rdeque, or rpqueue is empty
#'
#' @description Check if an rstack, rdeque, or rpqueue is empty.
#' @details Runs in \eqn{O(1)} time for all types.
#'
#' @param x rstack, rdeque, or rpqueue to check.
#' @param ... additional arguments to be passed to or from methods (ignored).
#' @return logical vector of length 1.
#' @examples
#' s <- rstack()
#' print(empty(s)) ## TRUE
#' s <- insert_top(s, "a")
#' print(empty(s)) ## FALSE
empty <- function(x, ...) {UseMethod("empty", x)}
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