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Compiler Error C3764

'override_function': cannot override base class method 'base_class_function'

The compiler detected an ill-formed override. For example, the base class function was not virtual. For more information, see override.

The following sample generates C3764.

// C3764.cpp
// compile with: /clr /c
public ref struct A {
   void g(int);
   virtual void h(int);

public ref struct B : A {
   virtual void g(int) override {}   // C3764
   virtual void h(int) override {}   // OK

C3764 can also occur when a base class method is both explicitly and named overridden. The following sample generates C3764.

// C3764_b.cpp
// compile with: /clr /c
ref struct A {
   virtual void Test() {}

ref struct B : public A {
   virtual void Test() override {}
   virtual void Test2() = A::Test {}   // C3764