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Compiler Warning (level 3) C4570

'type' : is not explicitly declared as abstract but has abstract functions

A type that contains abstract (C++ Component Extensions) functions should itself be marked as abstract.

The following sample generates C4570.

// C4570.cpp
// compile with: /clr /W3 /c
ref struct X {   // C4570
// try the following line instead
// ref class X abstract {
   virtual void f() abstract;
};
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