bors-servo
b9372673f0
Converting between dictionary types I'm trying to use the `CFDictionary` and `CFMutableDictionary` types more extensively. But run into problems. They are not very compatible with each other. This crate for example does not expose any clean way of using `CFDictionaryCreateMutableCopy` to create a `CFMutableDictionary` from any `CFDictionary`. I added a `From` implementation for this. It was not possible to, in some safe/simple way, cast a `CFDictionary<K, V>` into the untyped `CFDictionary<*const c_void, *const c_void>` something I added `to_untyped` to be able to do. When it comes to downcasting, it was not possible to downcast a `CFType` into a dictionary, since they don't implement `ConcreteCFType`. Something they probably should, for the case where the keys and values are just void pointers. `CFArray` does exactly this. Lastly, what I needed the most was to be able to convert a `CFMutableDictionary` into a `CFDictionary`. This allows me to borrow an immutable `CFDictionary` via the `ItemRef` type basically. It's possible to work around this and actually have owned instances of a `CFDictionary` and a `CFMutableDictionary` pointing to the same actual dictionary by doing this: ```rust let mut_dict = CFMutableDictionary::new(); let mut_dict2 = mut_dict.clone(); let dict = mut_dict.as_immutable(); // Here one can mutate the dict via `mut_dict2` while `dict` is still in scope/alive. ``` But since we already allow cloning a `CFMutableDictionary` to have two mutable references to the same dictionary I guess someone decided this should be viewed as safe. Both `CFDictionary` and `CFMutableDictionary` does not implement `Send` so we should not end up in any actual thread inconsistencies here. If the above is indeed considered safe, I could get rid of the `ItemRef` juggling and just make it `fn as_immutable(&self) -> CFDictionary` directly maybe? Would simplify usage. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/core-foundation-rs/265) <!-- Reviewable:end -->
core-foundation-rs
Compatibility
Targets macOS 10.7 by default.
To enable features added in macOS 10.8, set Cargo feature mac_os_10_8_features. To have both 10.8 features and 10.7 compatibility, also set mac_os_10_7_support. Setting both requires weak linkage, which is a nighty-only feature as of Rust 1.19.
For more experimental but more complete, generated bindings take a look at https://github.com/michaelwu/RustKit.