question about the c++ code

[David Jencks]

I know virtually nothing about C++ but noticed this when scanning  
through the C++ port of the jms framework, and it looked odd to me:

In ActiveMQConnectionFactory.cpp I see this constructor:
ActiveMQConnectionFactory::ActiveMQConnectionFactory( const char*  
userName,
        const char* password,
        const char* brokerUrl ) throw( CMSException )
{
        this->userName = userName;
        this->password = password;

    brokerUrl = brokerUrl;

    transportFactory = new  
activemq::transport::stomp::StompTransportFactory();
}


I'd expect the 3rd assignment to be

this->broketUrl = brokerUrl;

If the code as written is correct, could someone explain to me how  
UserName and password are different from brokerUrl?

thanks
david jencks