ofParameter and addListener confusion

Hey all, I have this use case:

ofParameter<bool> b;
void changedB(bool& val);

Now I can do the following:

b.addListener(this, &ofApp::changedB);

but I can't call the same function using the parameter:

changedB(b);
changedB(b.get());

I have to do this:

bool b2 = b;
changedB(b2);

Am I missing something?