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An Objective-C pattern for making sum types - ExampleSwitcher.h
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| #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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