openFrameworks - callback parameterGroup . ofParameterGroup / Changed_params / name = e.getName()

ofParameterGroup_Changed_params

// .h
ofParameterGroup params{"PARAMS"};
void Changed_params(ofAbstractParameter &e);

bool DISABLE_Callbacks = false;//to avoid callback crashes or to enable only after setup()

// .cpp
// setup()
//params
SHOW_gui.set("SHOW_gui", true);
params.setName("AppSettings");
params.add(SHOW_gui);
params.add(SHOW_User);
...

ofAddListener(params.parameterChangedE(), this, &ofApp::Changed_params); // setup()
ofRemoveListener(params.parameterChangedE(), this, &ofApp::Changed_params); // exit()

// callback for a parameter group  
void ofApp::Changed_params(ofAbstractParameter &e)
{
	if (!DISABLE_Callbacks)
	{
		string name = e.getName();
		ofLogNotice() << "Changed parameter named: " << name << " : with value " << e;

		if (name == SHOW_gui.getName())
		{
			if (SHOW_gui)
			{}
		}
		else if (name == SHOW_User.getName())
		{
			if (SHOW_User)
			{}
		}
	}
}