Compiler Error C3807

 

For the latest documentation on Visual Studio 2017, see Visual Studio 2017 Documentation.

For the latest documentation on Visual Studio 2017, see Compiler Error C3807 on docs.microsoft.com. 'type' : a class with the ComImport attribute cannot derive from 'type2', only interface implementation is allowed

A type that derived from ComImportAttribute can only implement an interface.

The following sample generates C3807.

// C3807.cpp  
// compile with: /clr /c  
ref struct S {};  
interface struct I {};  
  
[System::Runtime::InteropServices::ComImportAttribute()]  
ref struct S1 : S {};   // C3807  
ref struct S2 : I {};  

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