Struct Enum support for Keil compiler

Hi,
Need information on support of scoped enums in Keil compiler.
My final objective is to use the Enums as AIAction:Enter</i or AIAction:Exit instead of plain Enter or Exit in the source code C files.
This is to solve the global namespace pollution.

I have the following structure in header file :

struct AIAction{
    enum AIActionType
    {
        Enter,
        Exit,
        Run,
    };
};

For using it, following is the code in C file (filetype is C)

    int iType;
    iType = AIAction::Run;

When I compile this with current settings, it is giving me error #618: struct or union declares no named members

However, if I change the filetype to C++, it compiles successfully. So basically C++ compiler is allowing such structure definition.

From this, I infer that C has got limitation of not allowing any non-named members in structures.

How do I use the enums the way I want? Can this be achieved without using C++ compiler?