testcase for https://github.com/openframeworks/openFrameworks/pull/4784

main.cpp

#include "ofMain.h"
#include "ofApp.h"

class ofApp : public ofBaseApp {
	ofEventListener listener;

	ofParameter<float> param;

public:
	void setup() {
	
		listener = param.newListener([=](float& arg) {
			ofLogNotice() << arg;
		});


	};
	void update() {
	
		param = ofGetFrameNum();
	};
	void draw() {};


};


//========================================================================
int main() {
	ofSetupOpenGL(1024, 768, OF_WINDOW);			// <-------- setup the GL context

	// this kicks off the running of my app
	// can be OF_WINDOW or OF_FULLSCREEN
	// pass in width and height too:
	ofRunApp(new ofApp());

}