openFrameworks - bool parameter lambda callback listener: button and toggle

ofApp.cpp

//group
ofAddListener(params.parameterChangedE(), this, &ofxGpuLutCube::Changed_params);

//toggle
ofEventListener listener;
listener = SHOW_CONTROL.newListener([this](bool b) {
	OSC_Helper.setVisiblePlots(b);
	//std::cout << b << std::endl;
});

//buttons
listener_bPrev = bPrevious.newListener([this](const void * sender) {
	ofParameter<void> * p = (ofParameter<void> *)sender;
	string name = p->getName();
	ofLogNotice("ofxGpuLutCube") << "Changed_button_param: 'PREVIOUS'";
	if (name == "PREVIOUS")
	{
		previous();
	}
});

listener_bNext = bNext.newListener([this](const void * sender) {
	ofParameter<void> * p = (ofParameter<void> *)sender;
	string name = p->getName();
	ofLogNotice("ofxGpuLutCube") << "Changed_button_param: 'NEXT'";
	if (name == "NEXT")
	{
		next();
	}
});