peek_front<-.rpqueue {rstackdeque}

Assign to/modify the front of an rpqueue

Description

Allows modification access to the front of a queue.

Usage

## S3 replacement method for class 'rpqueue'
peek_front(x, ...) <- value

Arguments

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.

Details

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).

Value

modified rpqueue.

See Also

peek_front.rpqueue for accessing the front data element.

Examples

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)