File: CFAvailability.h

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#if __has_attribute(enum_extensibility)
#define __CF_ENUM_ATTRIBUTES __attribute__((enum_extensibility(open)))
#define __CF_CLOSED_ENUM_ATTRIBUTES __attribute__((enum_extensibility(closed)))
#define __CF_OPTIONS_ATTRIBUTES                                                \
  __attribute__((flag_enum, enum_extensibility(open)))
#else
#define __CF_ENUM_ATTRIBUTES
#define __CF_CLOSED_ENUM_ATTRIBUTES
#define __CF_OPTIONS_ATTRIBUTES
#endif

#if (__cplusplus)
#define CF_OPTIONS(_type, _name)                                               \
  _type __attribute__((availability(swift, unavailable))) _name;               \
  enum __CF_OPTIONS_ATTRIBUTES : _name
#else
#define CF_OPTIONS(_type, _name)                                               \
  enum __CF_OPTIONS_ATTRIBUTES _name : _type _name;                            \
  enum _name : _type
#endif

#define NS_OPTIONS(_type, _name) CF_OPTIONS(_type, _name)

typedef NS_OPTIONS(int, StandardNSOption) {
  StandardNSOption1,
  StandardNSOption2
};