Proof-of-concept for how one could implement Objective C's target/action paradigm in a static fashion in C++. Basically, the GeneratedWindow class would be what your UI builder (like Interface Builder) generates. Button would be in your application framework. ViewController and the main() function would be how you'd then use them.

main.cpp

//
//  main.cpp
//  CppTargetActionOutlets
//
//  Created by Uli Kusterer on 07.04.17.
//  Copyright © 2017 Uli Kusterer. All rights reserved.
//

#include <iostream>
#include <functional>


using namespace std;
using namespace std::placeholders;

class Button
{
public:
	void	DoPush()	{ if( action ) action(this); }
	
	std::function<void(Button*)>	action;
};


class ViewController
{
public:
	void	DoOKButton( Button* inButton ) { cout << "Button clicked." << endl; }
};


class GeneratedWindow
{
public:
	GeneratedWindow( ViewController* inOwner ) { mButton.action = std::bind(&ViewController::DoOKButton, inOwner, _1); }
	
	Button	mButton;
};


int main( int argc, const char * argv[] )
{
	ViewController	theController;
	GeneratedWindow	theWindow( &theController );
	
	theWindow.mButton.DoPush();
	
	return 0;
}