src/Eloquent/Typhoon/Parser/ParameterListParser.php
protected function parseByReference($content, &$position)
    {
        $this->typeCheck->parseByReference(func_get_args());

        return null !== $this->parseContent(
            $content,
            $position,
            '/^\s*(&)/',
            true,
            'byReference'
        );
    }
protected function parseByReference($content, &$position)
    {
        $this->typeCheck->parseByReference(func_get_args());

        return null !== $this->parseContent(
            $content,
            $position,
            '/^\s*(&)/',
            true,
            'byReference'
        );
    }
@param string $content
@param integer &$position

@return boolean