More Encode and RefEncode implementations
#52
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This was not done previously because of uncertainty with the `char*` being the "String" encoding. But investigation shows that: - @encode(signed char) -> "c" - @encode(unsigned char) -> "C" - @encode(char*) -> "*" - @encode(char**) -> "^*" And here it doesn't matter if we replace `char` with e.g. `uint8_t`, the encoding scheme still works like this. Luckily `RefEncode` is designed in just the right way that it can actually handle this really nicely!
Allows `*const *const c_void` and such.
madsmtm
commented
Oct 30, 2021
| /// You should not rely on this encoding to exist for any other purpose (since | ||
| /// `()` is not FFI-safe)! | ||
| /// | ||
| /// TODO: Figure out a way to remove this. |
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Calling attention to this. Possible solution would be to change encode_fn_pointer_impl! and similar macros to handle both the case where R: Encode and where R = ()
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RefEncodefor number types (fixes Implement Encode for more types SSheldon/rust-objc#26)RefEncodefor*const c_voidand*mut c_voidEncodeandRefEncodeforWrapping<T>I chose not to implement
RefEncodeforBoxbecause of the hazzle withno_stdstuff, and because I don't think it'll be very useful.RefEncodebeingEncode::Stringoni8andu8makesRefEncodeonBOOLwrong (apparentlyBOOLis more special than just a type-alias overchar?), but this was a problem before (just limited to raw pointers toBOOL; now it's also a problem with references toBOOL).However, the newtype
Booldoesn't suffer from this issue, and using pointers toBOOLis very rare in practice; so I think proper documentation onBOOL(which this PR adds) should solve this issue well enough.