Compiler Warning (level 1) C4912
Collapse the table of content
Expand the table of content
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here. ArchiveDisclaimer

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()
© 2015 Microsoft