Compiler Error C2570

  • Article

'identifier' : union cannot have base classes

A union derives from a class, structure, or union. This is not allowed. Declare the derived type as a class or structure instead.

The following sample generates C2570:

// C2570.cpp
// compile with: /c
class base {};
union hasPubBase : public base {};   // C2570
union hasNoBase {};   // OK