Compiler Warning (level 1) C4917
Error Message
'declarator' : a GUID can only be associated with a class, interface or namespace
A user-defined structure other than class, interface, or namespace cannot have a GUID.
This warning is off by default. See Compiler Warnings That Are Off by Default for more information.
The following code sample generates C4917:
// C4917.cpp
// compile with: /W1
#pragma warning(default : 4917)
__declspec(uuid("00000000-0000-0000-0000-000000000001")) struct S
{
} s; // C4917, don't put uuid on a struct
int main()
{
}