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<?php namespace Amp; /** * A NullCancellationToken can be used to avoid conditionals to check whether a token has been provided. * * Instead of writing * * ```php * if ($token) { * $token->throwIfRequested(); * } * ``` * * potentially multiple times, it allows writing * * ```php * $token = $token ?? new NullCancellationToken; * * // ... * * $token->throwIfRequested(); * ``` * * instead. */ final class NullCancellationToken implements CancellationToken { /** @inheritdoc */ public function subscribe(callable $callback): string { return "null-token"; } /** @inheritdoc */ public function unsubscribe(string $id) { // nothing to do } /** @inheritdoc */ public function isRequested(): bool { return false; } /** @inheritdoc */ public function throwIfRequested() { // nothing to do } }
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