c++ - I am losing control and unable to Debug -

class base { private:     int nid;     friend int fndeletebase(base*  base); public:      base( int baseid):nid(baseid) { cout << "base constructed value" << endl; }     base () : nid(5){cout << "base constructed without value" << endl; }     ~base() { cout << "base class object killed " << endl; } };  int fndeletebase(base* base)                           // line 1 {     delete base;                                       // line 2 - important     cout << "base object deleted " << endl;      return (1); }  int main() {     base abase;                                        // line 3      try     {         int = fndeletebase(&abase);                  // line 4      }     catch(...)     {         cout << "exception handled " << endl;     }      return (0); } 

the above code snippet debugging. unable step @ line 2 deleting base object. try step or run on line 2, control goes , have kill debugging or execution

the output is:

base constructed (any of construction valid)  base class object killed 

however works fine , if line 3 changed base * abase = new base();. output on console is:

base constructed (any of construction valid)  base class object killed  base object deleted 

can share technical details behind two?

you should only use delete on pointers constructed using new (or pointers assigned other pointers constructed using new), no exceptions (that know of).

using delete on else (which happens in first case, since parameter of fndeletebase pointer base abase, not pointer , there no new keyword there) results in undefined behaviour.

explaining compiler won't helpful as, undefined behaviour, can differ compiler compiler. , should avoided @ costs.