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Building An Ios App In Rust, Part 3: Passing Owned Objects Among Rust And Ios
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The code in this post utilizes an element that was as of late balanced out, so in the event that you are tracking with your own compiler toolchain, note that you'll require Rust 1.4 or more up to date.
Another significant change is that we're presently utilizing Swift 2, which added the ability to pass Swift capacities to C APIs that needed capacity pointers. We never again need to drop down into Objective-C to wrap our Rust code.
In Part 2, we finished with passing strings among Rust and Swift. Our execution worked yet was not perfect in either heading:
• When passing a Swift String into Rust by means of the c_string_to_rust work, the pointer we provide for Rust is legitimate for the term of the capacity call. On the off chance that we need to keep the string to accomplish something with it later, we'd have to make a duplicate of the string information.
• When passing a Rust string to Swift as we did in the get_string_from_rustfunction, the pointer we returned was substantial simply because it indicated static steady information. We don't right now have an approach to pass a progressively distributed string from Rust to Swift.
Both of these issues would be finished masterpieces for a genuine application. We need an approach to pass considerably more unpredictable information than strings, and we'll should probably accurately and securely deal with the responsibility for information.
As in Part 2, we won't go over each line of code in detail, however the majority of the code for this post is accessible on GitHub.
Possession in Rust
Rust is an extraordinary language for various reasons, yet the one component where it truly sparkles is the way it manages possession (who is in charge of dispensing and deallocating assets held by an occasion) and obtaining (crediting out transitory access to an occurrence without giving endlessly proprietorship. Much has been expounded on this, with more detail than I can offer here. In the event that you need to find out additional, look at the superb Fearless Concurrency with Rust blog entry just as the Rust book's areas on Ownership, References and Borrowing and Lifetimes.
In unadulterated Rust, the compiler ensures you obey possession decides that guarantee all assets will be tidied up at the best possible time. A similar proprietorship rules give string security ensures that we'll examine in a later post. When we're working with the remote capacity interface (FFI) layer, we must be substantially more watchful, as we're cooperating with a framework outside of the Rust compiler's information, so we don't get so much help.
The most fundamental things we need to almost certainly comprehend are (a) to what extent will an article we're going between dialects be substantial (e.g., in c_string_to_rust, the pointer is legitimate just for the capacity call), and (b) who is in charge of tidying it up (e.g., in c_string_to_rust, Swift will free the string's memory). For whatever is left of this post, we're going to see how to pass responsibility for item over the limit: making an article in Rust and giving duty regarding its cleanup to Swift and the other way around.
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