class LateBindingTracer

class LateBindingTracer implements TracerInterface {
    private ?TracerInterface $tracer = null;
    
    /** @param Closure(): TracerInterface $factory */
    public function __construct(Closure $factory) {
    }
    public function spanBuilder(string $spanName) : SpanBuilderInterface {
        return ($this->tracer ??= ($this->factory)())
            ->spanBuilder($spanName);
    }
    public function isEnabled() : bool {
        return true;
    }

}