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<?php namespace Ds; /** * Collection is the base interface which covers functionality common to all the * data structures in this library. It guarantees that all structures are * traversable, countable, and can be converted to json using json_encode(). * * @package Ds * * @template-covariant TKey * @template-covariant TValue * @extends Traversable<TKey, TValue> */ interface Collection extends \IteratorAggregate, \Countable, \JsonSerializable { /** * Removes all values from the collection. */ public function clear(); /** * Returns the size of the collection. * * @return int */ public function count(): int; /** * Returns a shallow copy of the collection. * * @return static a copy of the collection. * * @psalm-return static<TKey, TValue> */ public function copy(); /** * Returns whether the collection is empty. * * This should be equivalent to a count of zero, but is not required. * Implementations should define what empty means in their own context. */ public function isEmpty(): bool; /** * Returns an array representation of the collection. * * The format of the returned array is implementation-dependent. * Some implementations may throw an exception if an array representation * could not be created. * * @return array<TKey, TValue> */ public function toArray(): array; }
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