classes/Factory/Definition.php
public function addArgument(ArgumentInterface $argument)
	{
		$this->argumentPositions[$argument->getPosition()] = $argument;
		$this->argumentNames[$argument->getName()] = $argument;
		if ($argument->isClass()) {
			$this->argumentClasses[$argument->getClass()] = $argument;
		}
		return $argument;
	}
public function addArgument(ArgumentInterface $argument)
	{
		$this->argumentPositions[$argument->getPosition()] = $argument;
		$this->argumentNames[$argument->getName()] = $argument;
		if ($argument->isClass()) {
			$this->argumentClasses[$argument->getClass()] = $argument;
		}
		return $argument;
	}
Add an argument to the factory definition.

@param ArgumentInterface $argument