length.rpqueue {rstackdeque}

Return the number of elements in an rpqueue

Description

Returns the number of elements in an rpqueue.

Usage

## S3 method for class 'rpqueue'
length(x)

Arguments

x

rpqueue to get the length of.

Details

Runs in O(1) time, as this information is stored seperately and updated on every insert/remove.

Value

a vector of length 1 with the number of elements.

See Also

empty for checking whether an rpqueue is empty.

Examples

q <- rpqueue()
q <- insert_back(q, "a")
print(length(q))         # 1
q <- insert_back(q, "b")
print(length(q))         # 2