37 lines
911 B
V
37 lines
911 B
V
|
module datatypes
|
||
|
|
||
|
|
pub struct Queue<T> {
|
||
|
|
mut:
|
||
|
|
elements LinkedList<T>
|
||
|
|
}
|
||
|
|
|
||
|
|
// is_empty checks if the queue is empty
|
||
|
|
pub fn (queue Queue<T>) is_empty() bool {
|
||
|
|
return queue.elements.is_empty()
|
||
|
|
}
|
||
|
|
|
||
|
|
// len returns the length of the queue
|
||
|
|
pub fn (queue Queue<T>) len() int {
|
||
|
|
return queue.elements.len()
|
||
|
|
}
|
||
|
|
|
||
|
|
// peek returns the head of the queue
|
||
|
|
pub fn (queue Queue<T>) peek() ?T {
|
||
|
|
return if !queue.is_empty() { queue.elements.first() ? } else { error('Queue is empty') }
|
||
|
|
}
|
||
|
|
|
||
|
|
// push adds an element to the tail of the queue
|
||
|
|
pub fn (mut queue Queue<T>) push(item T) {
|
||
|
|
queue.elements.push(item)
|
||
|
|
}
|
||
|
|
|
||
|
|
// pop removes the element at the head of the queue and returns it
|
||
|
|
pub fn (mut queue Queue<T>) pop() ?T {
|
||
|
|
return if !queue.is_empty() { queue.elements.shift() ? } else { error('Queue is empty') }
|
||
|
|
}
|
||
|
|
|
||
|
|
// str returns a string representation of the queue
|
||
|
|
pub fn (queue Queue<T>) str() string {
|
||
|
|
return queue.elements.str()
|
||
|
|
}
|