peek_front<-.rpqueue {rstackdeque} | R Documentation |
Allows modification access to the front of a queue.
## S3 replacement method for class 'rpqueue' peek_front(x, ...) <- value
x |
rpqueue to modify the front element of. |
... |
additional arguments to be passed to or from methods (ignored). |
value |
value to assign to the front data element. |
Runs in O(1) worst case time. Throws an error if the rpqueue is empty
. Modifies the element in place (i.e., is not side-effect-free).
modified rpqueue.
peek_front.rpqueue
for accessing the front data element.
q <- rpqueue() q <- insert_back(q, data.frame(a = 1, b = 1)) q <- insert_back(q, data.frame(a = 1, b = 1)) peek_front(q)$a <- 100 print(q) peek_front(q) <- data.frame(a = 100, b = 100) print(q)