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<?php
namespace Ds;

/**
 * Hashable is an interface which allows objects to be used as keys.
 *
 * It’s an alternative to spl_object_hash(), which determines an object’s hash
 * based on its handle: this means that two objects that are considered equal
 * by an implicit definition would not treated as equal because they are not
 * the same instance.
 *
 * @package Ds
 */
interface Hashable
{
    /**
     * Produces a scalar value to be used as the object's hash, which determines
     * where it goes in the hash table. While this value does not have to be
     * unique, objects which are equal must have the same hash value.
     *
     * @return mixed
     */
    public function hash();

    /**
     * Determines if two objects should be considered equal. Both objects will
     * be instances of the same class but may not be the same instance.
     *
     * @param mixed $obj An instance of the same class to compare to.
     */
    public function equals($obj): bool;
}