#define GETISA(c)       ((c)->isa)

#define RECEIVER(c)     ((c).receiver)

#define _C_CONST    'r'
#define _C_IN       'n'
#define _C_INOUT    'N'
#define _C_OUT      'o'
#define _C_BYCOPY   'O'
#define _C_ONEWAY   'V'
#define _C_LNGLNG   'q'
#define _C_ULNGLNG  'Q'
#define _C_BOOL	    'B'		/* (Objective-)C++ 'bool' */