C1052: Unions cannot have class/struct object members containing Con/Destructor/Assign-Operator

[ERROR]

The specified union member was declared with a special member (Con/Destructor/Assign-Operator).

  class A {

  

    A(void);

  

  };

  

  union B {

  

    A a;

  

  };

  

The union member may contain only compiler generated special members. So try to compile with the option -Cn=Ctr enabled.