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hborders/ExampleSwitcher.h

Last active March 13, 2017 16:49
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An Objective-C pattern for making sum types - ExampleSwitcher.h
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ExampleSwitcher.h
#import "Example.h" // https://gist.github.com/hborders/2af9b39e27b62ef9e68c65085126fe4a
@interface ExampleSwitcher<ReturnType : NSObject *> : NSObject
+ (instancetype _Nonnull)new NS_UNAVAILABLE;
- (instancetype _Nonnull)init NS_UNAVAILABLE;
+ (ReturnType _Nonnull)nonnullValueFrom:(Example * _Nonnull)example
switchFoo:(ReturnType _Nonnull (^ _Nonnull)(ExampleFoo * _Nonnull foo_))fooBlock
bar:(ReturnType _Nonnull (^ _Nonnull)(ExampleBar * _Nonnull bar_))barBlock;
+ (ReturnType _Nullable)nullableValueFrom:(Example * _Nonnull)example
switchFoo:(ReturnType _Nullable (^ _Nonnull)(ExampleFoo * _Nonnull foo_))fooBlock
bar:(ReturnType _Nullable (^ _Nonnull)(ExampleBar * _Nonnull bar_))barBlock;
@end
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