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#include <iostream>
using namespace std;
 
void my_callback( AmsAddr*, AdsNotificationHeader*, unsigned long );
 
// Wichtig: MyClass darf nicht kopierbar sein, weil sie ihre Adresse in
// einem Callback registriert!
class MyClass
{
	// "echter" Callback ist friend, damit er die private Methode aufrufen darf
	friend void my_callback( AmsAddr*, AdsNotificationHeader*, unsigned long );
 
public:
	MyClass()
	{
		AdsSyncAddDeviceNotificationReq( pAddr, 
										 ADSIGRP_SYM_VALBYHND, 
										 lHdlVar, 
										 &NotificationSettings, 
										 &my_callback,
										 *reinterpret_cast<unsigned long*>( this ),
										 &lHdlNotification);		
	}
 
	~MyClass()
	{
		// Callback wieder austragen!
	}
 
 
	MyClass( MyClass const& other ) = delete;
	MyClass( MyClass&& other ) = delete;
 
	MyClass& operator=( MyClass const& other ) = delete;
	MyClass& operator=( MyClass&& other ) = delete;
 
 
private:
	void OnCallback( AmsAddr* addr, AdsNotificationHeader* header )
	{
		// tadaaa	
	}
};
 
void my_callback( AmsAddr* addr, AdsNotificationHeader* header, unsigned long param )
{
	MyClass* instance = reinterpret_cast<MyClass*>( param );
	instance->OnCallback( addr, header );
}
 
int main() 
{
	// your code goes here
	return 0;
}

prog.cpp:4:19: error: variable or field ‘my_callback’ declared void
 void my_callback( AmsAddr*, AdsNotificationHeader*, unsigned long );
                   ^~~~~~~
prog.cpp:4:19: error: ‘AmsAddr’ was not declared in this scope
prog.cpp:4:27: error: expected primary-expression before ‘,’ token
 void my_callback( AmsAddr*, AdsNotificationHeader*, unsigned long );
                           ^
prog.cpp:4:29: error: ‘AdsNotificationHeader’ was not declared in this scope
 void my_callback( AmsAddr*, AdsNotificationHeader*, unsigned long );
                             ^~~~~~~~~~~~~~~~~~~~~
prog.cpp:4:51: error: expected primary-expression before ‘,’ token
 void my_callback( AmsAddr*, AdsNotificationHeader*, unsigned long );
                                                   ^
prog.cpp:4:53: error: expected primary-expression before ‘unsigned’
 void my_callback( AmsAddr*, AdsNotificationHeader*, unsigned long );
                                                     ^~~~~~~~
prog.cpp:11:27: error: ‘AmsAddr’ has not been declared
  friend void my_callback( AmsAddr*, AdsNotificationHeader*, unsigned long );
                           ^~~~~~~
prog.cpp:11:37: error: ‘AdsNotificationHeader’ has not been declared
  friend void my_callback( AmsAddr*, AdsNotificationHeader*, unsigned long );
                                     ^~~~~~~~~~~~~~~~~~~~~
prog.cpp:39:19: error: ‘AmsAddr’ has not been declared
  void OnCallback( AmsAddr* addr, AdsNotificationHeader* header )
                   ^~~~~~~
prog.cpp:39:34: error: ‘AdsNotificationHeader’ has not been declared
  void OnCallback( AmsAddr* addr, AdsNotificationHeader* header )
                                  ^~~~~~~~~~~~~~~~~~~~~
prog.cpp: In constructor ‘MyClass::MyClass()’:
prog.cpp:16:36: error: ‘pAddr’ was not declared in this scope
   AdsSyncAddDeviceNotificationReq( pAddr,
                                    ^~~~~
prog.cpp:17:12: error: ‘ADSIGRP_SYM_VALBYHND’ was not declared in this scope
            ADSIGRP_SYM_VALBYHND,
            ^~~~~~~~~~~~~~~~~~~~
prog.cpp:18:12: error: ‘lHdlVar’ was not declared in this scope
            lHdlVar,
            ^~~~~~~
prog.cpp:19:13: error: ‘NotificationSettings’ was not declared in this scope
            &NotificationSettings,
             ^~~~~~~~~~~~~~~~~~~~
prog.cpp:20:13: error: ‘my_callback’ was not declared in this scope
            &my_callback,
             ^~~~~~~~~~~
prog.cpp:22:13: error: ‘lHdlNotification’ was not declared in this scope
            &lHdlNotification);
             ^~~~~~~~~~~~~~~~
prog.cpp:16:3: error: ‘AdsSyncAddDeviceNotificationReq’ was not declared in this scope
   AdsSyncAddDeviceNotificationReq( pAddr,
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.cpp: At global scope:
prog.cpp:45:19: error: variable or field ‘my_callback’ declared void
 void my_callback( AmsAddr* addr, AdsNotificationHeader* header, unsigned long param )
                   ^~~~~~~
prog.cpp:45:19: error: ‘AmsAddr’ was not declared in this scope
prog.cpp:45:28: error: ‘addr’ was not declared in this scope
 void my_callback( AmsAddr* addr, AdsNotificationHeader* header, unsigned long param )
                            ^~~~
prog.cpp:45:34: error: ‘AdsNotificationHeader’ was not declared in this scope
 void my_callback( AmsAddr* addr, AdsNotificationHeader* header, unsigned long param )
                                  ^~~~~~~~~~~~~~~~~~~~~
prog.cpp:45:57: error: ‘header’ was not declared in this scope
 void my_callback( AmsAddr* addr, AdsNotificationHeader* header, unsigned long param )
                                                         ^~~~~~
prog.cpp:45:65: error: expected primary-expression before ‘unsigned’
 void my_callback( AmsAddr* addr, AdsNotificationHeader* header, unsigned long param )
                                                                 ^~~~~~~~

Standard output is empty