Compiler Error C3139

'struct' : cannot export a UDT without members

Remarks

You attempted to apply the export attribute to an empty UDT (user-defined type).

Example

For example:

// C3139.cpp
#include "unknwn.h"
[emitidl];
[module(name=xx)];

[export] struct MyStruct {   // C3139 empty type
};
int main(){}