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#include <new>
#include <cstdlib>
 
class X
{
protected:
  static void* operator new(size_t sz);
  static void  operator delete(void* p) noexcept;
};
 
class Y : public X { };  // inheritance is ok
class Z { X x; };        // ok
 
X x1;                    // ok
int main()
{
  X x2;                  // ok
  Y y1;                  // ok
  X* xp = new X;         // syntax error
  Y* yp = new Y;         // syntax error
 
  delete xp;             // syntax error
  delete yp;             // syntax error
};

prog.cpp: In function ‘int main()’:
prog.cpp:19:15: error: ‘static void* X::operator new(size_t)’ is protected within this context
   X* xp = new X;         // syntax error
               ^
prog.cpp:7:16: note: declared protected here
   static void* operator new(size_t sz);
                ^~~~~~~~
prog.cpp:20:15: error: ‘static void* X::operator new(size_t)’ is protected within this context
   Y* yp = new Y;         // syntax error
               ^
prog.cpp:7:16: note: declared protected here
   static void* operator new(size_t sz);
                ^~~~~~~~
prog.cpp:22:10: error: ‘static void X::operator delete(void*)’ is protected within this context
   delete xp;             // syntax error
          ^~
prog.cpp:8:16: note: declared protected here
   static void  operator delete(void* p) noexcept;
                ^~~~~~~~
prog.cpp:22:10: error: ‘static void X::operator delete(void*)’ is protected within this context
   delete xp;             // syntax error
          ^~
prog.cpp:8:16: note: declared protected here
   static void  operator delete(void* p) noexcept;
                ^~~~~~~~
prog.cpp:23:10: error: ‘static void X::operator delete(void*)’ is protected within this context
   delete yp;             // syntax error
          ^~
prog.cpp:8:16: note: declared protected here
   static void  operator delete(void* p) noexcept;
                ^~~~~~~~
prog.cpp:23:10: error: ‘static void X::operator delete(void*)’ is protected within this context
   delete yp;             // syntax error
          ^~
prog.cpp:8:16: note: declared protected here
   static void  operator delete(void* p) noexcept;
                ^~~~~~~~

Standard output is empty