typedef struct some_struct_pointer * PTYPE;

/*
 * Function and method declarations.
 * Checks mangling.
 */
/* No underscore, No mangling. */
void    _System             Void(void);
void *  _System             PVoid(void);
int     _System             Int(void);
PTYPE   _System             PType(void);

/*
 * Typedefs.
 * Checks that there is not warnings on these.
 */
typedef void    _System     Typedef1Void(void);
typedef void *  _System     Typedef1PVoid(void);
typedef int     _System     Typedef1Int(void);
typedef PTYPE   _System     Typedef1PType(void);

typedef void    (_System    Typedef2Void)(void);
typedef void *  (_System    Typedef2PVoid)(void);
typedef int     (_System    Typedef2Int)(void);
typedef PTYPE   (_System    Typedef2PType)(void);

typedef void    (* _System  PTypedef1Void)(void);
typedef void *  (* _System  PTypedef1PVoid)(void);
typedef int     (* _System  PTypedef1Int)(void);
typedef PTYPE   (* _System  PTypedef1PType)(void);

/* Alternate writing which should have the same effect I think... */
typedef void    (_System *  PTypedef2Void)(void);
typedef void *  (_System *  PTypedef2PVoid)(void);
typedef int     (_System *  PTypedef2Int)(void);
typedef PTYPE   (_System *  PTypedef2PType)(void);


/*
 * Structures.
 */
typedef struct VFT
{
    void    (_System *  PStructMemberVoid)(void* pvThis);
    void *  (_System *  PStructMemberPVoid)(void* pvThis);
    int     (_System *  PStructMemberInt)(void* pvThis);
    PTYPE   (_System *  PStructMemberPType)(void* pvThis);

    /* Alternate writing which should have the same effect I think... */
    void    ( _System * PStructMember2Void)(void* pvThis);
    void *  ( _System * PStructMember2PVoid)(void* pvThis);
    int     ( _System * PStructMember2Int)(void* pvThis);
    PTYPE   ( _System * PStructMember2PType)(void* pvThis);

} VFT, *PVFT;


int DoC(void)
{
    VFT vft = {0,0,0,0};

    Void();
    PVoid();
    Int();
    PType();

    if (vft.PStructMemberVoid)
        vft.PStructMemberVoid(&vft);
    if (vft.PStructMemberPVoid)
        vft.PStructMemberPVoid(&vft);
    if (vft.PStructMemberInt)
        vft.PStructMemberInt(&vft);
    if (vft.PStructMemberPType)
        vft.PStructMemberPType(&vft);

    return 0;
}