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Compiler Warning (level 1) C4912

Error Message

'attribute': attribute has undefined behavior on a nested UDT

Attributes that apply to nested UDTs (user-defined type, which could be a typedef, union, or struct) may be ignored.

The following code shows how this warning would be generated:

// C4912.cpp
// compile with: /W1
#include <windows.h>
[emitidl, module(name="xx")];

[object, uuid("00000000-0000-0000-0000-000000000002")]
__interface IMy
{
};

[coclass, default(IMy), appobject, uuid("00000000-0000-0000-0000-000000000001")]
class CMy : public IMy
{
   [export, v1_enum] typedef enum myEnum { k3_1 = 1, k3_2 = 2 } myEnumv;   // C4912
};
int main()
{
}
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