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sodastsai/guard-declare.h

Last active August 25, 2017 03:09
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Swift `guard` in Objective-C
Raw
guard-declare.h
#define guard(CONDITION) if (CONDITION) {}
Raw
guard-use.m
@interface Math : NSObject
+ (nullable NSNumber *)divide:(nonnull NSNumber *)numberA byNumber:(nonnull NSNumber *)numberB;
@end
@implmentation Math
+ (nullable NSNumber *)divide:(nonnull NSNumber *)numberA byNumber:(nonnull NSNumber *)numberB {
guard (numberB.doubleValue != 0.0) else {
return nil;
}
return @(numberA.doubleValue / numberB.doubleValue);
}
@end
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