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    class A {
        void callAFunctionHere() {}
 
        struct TimerService {
            TimerService() {
                callAFunctionHere();
            }
        };
    };
 
    int main()
    {
        A a;
        A::TimerService ts;
    }
 

prog.cpp: In constructor 'A::TimerService::TimerService()':
prog.cpp:6:35: error: cannot call member function 'void A::callAFunctionHere()' without object
                 callAFunctionHere();
                                   ^
prog.cpp: In function 'int main()':
prog.cpp:4:16: error: 'struct A::TimerService' is private
         struct TimerService {
                ^
prog.cpp:14:12: error: within this context
         A::TimerService ts;
            ^

Standard output is empty