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Compiler Error C3640

Error Message

'member' : a referenced or virtual member function of a local class must be defined

The compiler requires certain functions to be defined.

The following sample generates C3640:

// C3640.cpp
void f() 
{
   struct S
   {
      virtual void f1();   // C3640
      // Try the following line instead:
      // virtual void f1(){}
   };
}

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