The PriorityQueue class

The PriorityQueue class

Introduction

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A PriorityQueue is very similar to a Queue. Values are pushed into the queue with an assigned priority, and the value with the highest priority will always be at the front of the queue.

Implemented using a max heap.

Note:

"First in, first out" ordering is preserved for values with the same priority.

Note:

Iterating over a PriorityQueue is destructive, equivalent to successive pop operations until the queue is empty.

Class synopsis

class Ds\PriorityQueue implements Ds\Collection {

/* Constants */

const int MIN_CAPACITY = 8;

/* Methods */

public allocate(int $capacity): void

public capacity(): int

public clear(): void

public copy(): Ds\PriorityQueue

public isEmpty(): bool

public peek(): mixed

public pop(): mixed

public push(mixed $value, int $priority): void

public toArray(): array

}

Predefined Constants

Ds\PriorityQueue::MIN_CAPACITY

Table of Contents

• Ds\PriorityQueue::allocate — Allocates enough memory for a required capacity
• Ds\PriorityQueue::capacity — Returns the current capacity
• Ds\PriorityQueue::clear — Removes all values
• Ds\PriorityQueue::__construct — Creates a new instance
• Ds\PriorityQueue::copy — Returns a shallow copy of the queue
• Ds\PriorityQueue::count — Returns the number of values in the queue
• Ds\PriorityQueue::isEmpty — Returns whether the queue is empty
• Ds\PriorityQueue::jsonSerialize — Returns a representation that can be converted to JSON
• Ds\PriorityQueue::peek — Returns the value at the front of the queue
• Ds\PriorityQueue::pop — Removes and returns the value with the highest priority
• Ds\PriorityQueue::push — Pushes values into the queue
• Ds\PriorityQueue::toArray — Converts the queue to an array

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https://www.php.net/manual/en/class.ds-priorityqueue.php