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#' Convert to Deque
#'
#' @param x
#' An object either to be converted to the first element of a deque
#' (default), or the elements of a list (or columns of a dataframe)
#' to be set as elements of a deque.
#'
#' @return
#' A queue, stack, or deque.
#'
#' @examples
#' \dontrun{
#' library(dequer)
#' d <- as.deque(lapply(1:5, identity))
#' d
#' }
#'
#' @name as.deque
#' @rdname as.deque
#' @export
as.deque <- function(x) UseMethod("as.deque")
#' @export
#' @rdname as.deque
as.deque.list <- function(x)
{
d <- deque()
for (obj in x)
push(d, obj)
rev(d)
return(d)
}
#' @export
#' @rdname as.deque
as.deque.default <- function(x)
{
d <- deque()
push(d, x)
return(d)
}
#' @export
#' @rdname as.deque
as.deque.queue <- function(x)
{
rev(x)
class(x) <- "deque"
return(x)
}
#' @export
#' @rdname as.deque
as.deque.stack <- function(x)
{
class(x) <- "deque"
return(x)
}
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