…anagi) This PR was merged into the 3.3-dev branch. Discussion ---------- [DI] Allow to count on lazy collection arguments | Q | A | ------------- | --- | Branch? | master | Bug fix? | no | New feature? | yes | BC breaks? | no | Deprecations? | no | Tests pass? | yes | Fixed tickets | #21450 (comment) | License | MIT | Doc PR | todo (with symfony/symfony-docs#7336) When using the new iterator feature of the DI component to lazy load collection, we always know the number of arguments in the collection (only the invalidBehavior set to `IGNORE_ON_INVALID_REFERENCE` may change this number). So we are able to generate and use a `RewindableGenerator` implementing `\Countable` by computing this value ahead. So, in a service accepting `array|iterable`, like in the `GuardAuthenticationListener` (see #21450): ```php class GuardAuthenticationListener implements ListenerInterface { private $guardAuthenticators; /** * @param iterable|GuardAuthenticatorInterface[] $guardAuthenticators The authenticators, with keys that match what's passed to GuardAuthenticationProvider * @param LoggerInterface $logger A LoggerInterface instance */ public function __construct($guardAuthenticators, LoggerInterface $logger = null) { // ... } public function handle(GetResponseEvent $event) { if (null !== $this->logger) { $context = array() if (is_array($this->guardAuthenticators) || $this->guardAuthenticators instanceof \Countable) { $context['authenticators'] = count($this->guardAuthenticators); } $this->logger->debug('Checking for guard authentication credentials.', $context); } // ... } } ``` we still keep the ability to call count without loosing the lazy load benefits. Commits ------- f23e460 [DI] Allow to count on lazy collection arguments

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Document the lazy collection type #7336

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