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#' @export
#' @title Check if an rdeque is empty
#' @description Check if an rdeque is empty.
#' @details Runs in \eqn{O(1)} time.
#' @param x the rdeque to check.
#' @param ... additional arguments to be passed to or from methods (ignored).
#' @return logical vector of length 1.
#' @seealso \code{\link{empty}} for the generic function that can be used on rstacks, rdeques, and rpqueues.
empty.rdeque <- function(x, ...) {
if(length(x) < 1) {
return(TRUE)
} else {
return(FALSE)
}
}
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