Objective-C Guard Macro For nil Objects

ObjCNilGuard.h

#define GET_MACRO(_1, _2, _3, _4, NAME, ...) NAME

#define FOR_EACH_1(_what_, _separator_, X) _what_(X)
#define FOR_EACH_2(_what_, _separator_, X, ...) _what_(X) _separator_ FOR_EACH_1(_what_, _separator_, __VA_ARGS__)
#define FOR_EACH_3(_what_, _separator_, X, ...) _what_(X) _separator_ FOR_EACH_2(_what_, _separator_, __VA_ARGS__)
#define FOR_EACH_4(_what_, _separator_, X, ...) _what_(X) _separator_ FOR_EACH_3(_what_, _separator_, __VA_ARGS__)

#define FOR_EACH_SEP(_action_, _separator_, ...) GET_MACRO(__VA_ARGS__, FOR_EACH_4, FOR_EACH_3, FOR_EACH_2, FOR_EACH_1)(_action_, _separator_, __VA_ARGS__)
#define FOR_EACH(_action_, ...) FOR_EACH_SEP(_action_, ;, __VA_ARGS__)

#define IS_NIL(_x_) (_x_ == nil)
#define ISN_NIL(_x_) !IS_NIL(_x_)
#define NIL_GUARD(_else_action_, ...) if(FOR_EACH_SEP(IS_NIL, ||, __VA_ARGS__)) { _else_action_; }

// usage: NIL_GUARD(return, obj1, obj2, obj3); <- returns if any of these objects are nil