Created
February 25, 2015 23:22
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Want nullability right away? This will degrade gracefully until you can drop Xcode 6.1/Xcode 6.2.
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| // Xcode 6.3 defines new language features to declare nullability | |
| #if __has_feature(nullability) | |
| #define PSPDF_ASSUME_NONNULL_BEGIN _Pragma("clang assume_nonnull begin") | |
| #define PSPDF_ASSUME_NONNULL_END _Pragma("clang assume_nonnull end") | |
| #define ps_nullable nullable | |
| #define ps_nonnull nonnull | |
| #define ps_null_unspecified null_unspecified | |
| #define ps_null_resettable null_resettable | |
| #define __ps_nullable __nullable | |
| #define __ps_nonnull __nonnull | |
| #define __ps_null_unspecified __null_unspecified | |
| #else | |
| #define PSPDF_ASSUME_NONNULL_BEGIN | |
| #define PSPDF_ASSUME_NONNULL_END | |
| #define ps_nullable | |
| #define ps_nonnull | |
| #define ps_null_unspecified | |
| #define ps_null_resettable | |
| #define __ps_nullable | |
| #define __ps_nonnull | |
| #define __ps_null_unspecified | |
| #endif |
In xcode 7, I get Macro name is a reserved identifier with the macros starting with __. Any ideas?
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Prefix-less defines could cause issues with some
__attribute__attributes, for example with:Last line will produce error. So, existing codebases must adopt new nullability features or use something old like
__attribute__((nonnull())). Interesting, how will they interact if some argument will be specified as nullable while having__attribute__((nonnull())).