- (instancetype)init NS_UNAVAILABLE; + (instancetype)new NS_UNAVAILABLE; - (instancetype)init NS_DESIGNATED_INITIALIZER;
#import @interface Calculator : NSObject @property (nonatomic) double result; - (void)pushOperand:(double)operand; - (void)add; - (instancetype)init NS_UNAVAILABLE; + (instancetype)new NS_UNAVAILABLE; @end
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