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class X
{
public:
  X() {}
  void destroy() const { delete this; }
protected:
  ~X() {}
};
 
class Y : public X { };    // inheritance is ok
class Z { X x; };          // syntax error, use pointer
 
 
X x1;                      // syntax error
int main()
{
    X x2;                  // syntax error
    Y y1;                  // ok, would be syntax error if ~X() was private
    X* xp = new X;         // ok
    Y* yp = new Y;         // ok
 
    delete xp;             // syntax error
    xp->destroy();         // ok
    delete yp;             // ok, would be syntax error if ~X() was private
};

prog.cpp: In function 'int main()':
prog.cpp:7:3: error: 'X::~X()' is protected
   ~X() {}
   ^
prog.cpp:17:7: error: within this context
     X x2;                  // syntax error
       ^
prog.cpp:7:3: error: 'X::~X()' is protected
   ~X() {}
   ^
prog.cpp:22:12: error: within this context
     delete xp;             // syntax error
            ^
prog.cpp: In function 'void __static_initialization_and_destruction_0(int, int)':
prog.cpp:7:3: error: 'X::~X()' is protected
   ~X() {}
   ^
prog.cpp:14:3: error: within this context
 X x1;                      // syntax error
   ^

Standard output is empty