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See: https://docs.swift.org/swift-book/documentation/the-swift-programming-language/errorhandling/.\r\n\r\nHere's an example of using this feature:\r\n\r\n```rust\r\n// Rust\r\n#[swift_bridge::bridge]\r\nmod ffi {\r\n    enum ResultTransparentEnum {\r\n        NamedField { data: i32 },\r\n        UnnamedFields(u8, String),\r\n        NoFields,\r\n    }\r\n    extern \"Rust\" {\r\n        type ThrowingInitializer;\r\n        #[swift_bridge(init)]\r\n        fn new(succeed: bool) -> Result<ThrowingInitializer, ResultTransparentEnum>;\r\n        fn val(&self) -> i32;\r\n    }\r\n}\r\n```\r\n\r\n```swift\r\n// Swift\r\ndo {\r\n    let throwingInitializer = try ThrowingInitializer(false)\r\n} catch let error as ResultTransparentEnum {\r\n    //...\r\n} catch {\r\n    //...\r\n}\r\n```","shortMessageHtmlLink":"Support throwing initializers (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2460803888\" data-permission-text=\"Title is private\" 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\"Rust\" {\r\n    fn getEnum() -> MyEnum;\r\n  }\r\n}\r\n```\r\n\r\nCloses #252.","shortMessageHtmlLink":"Apply input module visibility to output module (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2436256567\" data-permission-text=\"Title is private\" data-url=\"https://github.com/chinedufn/swift-bridge/issues/284\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/chinedufn/swift-bridge/pull/284/hovercard\" href=\"https://github.com/chinedufn/swift-bridge/pull/284\">#284</a>)"}},{"before":"717fcef70d3c293c2fd8b962ad678da18b10a3c3","after":"34ce1ffb6bc5a54730bf60cf177042e1f4e479ff","ref":"refs/heads/master","pushedAt":"2024-06-21T08:59:10.000Z","pushType":"pr_merge","commitsCount":1,"pusher":{"login":"chinedufn","name":"Chinedu Francis Nwafili","path":"/chinedufn","primaryAvatarUrl":"https://avatars.githubusercontent.com/u/2099811?s=80&v=4"},"commit":{"message":"Suppress dead_code warning when returning `-> Result<*, TransparentType>` (#278)\n\nIn Rust 1.79.0, dead code warnings are emitted from enums where the compiler does not infer that wrapped data is used, even when the enum has been annotated with `#[repr(C]`. This warning triggers in `swift-bridge` when defining transparent structs or enums that will be returned in error results.\r\n\r\nThis appears to be a regression in the `dead_code` rustc lint. Pending upstream fixes to rustc, this change to `swift-bridge` annotates generated result enums with `#[allow(unused)]`.\r\n\r\nFixes #270\r\n\r\n```\r\nerror: field `0` is never read\r\n   |\r\n1  | #[swift_bridge::bridge]\r\n   | ----------------------- field in this variant\r\n...\r\n3  |     enum ResultTransparentEnum {\r\n   |          ^^^^^^^^^^^^^^^^^^^^^\r\n   |\r\nhelp: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field\r\n   |\r\n3  |     enum () {\r\n   |          ~~\r\n```\r\n\r\n## Example bridge\r\n\r\nThe following bridge code is the minimal reproduction case:\r\n\r\n``` rust\r\n#[swift_bridge::bridge]\r\nmod ffi {\r\n    #[swift_bridge(swift_repr = \"struct\")]\r\n    struct TransparentErrorStruct(pub String);\r\n\r\n    extern \"Rust\" {\r\n        fn rust_func_returns_result_transparent_struct(\r\n            succeed: bool\r\n        ) -> Result<(), TransparentErrorStruct>;\r\n    }\r\n}\r\n\r\nfn rust_func_returns_result_transparent_struct(\r\n    succeed: bool\r\n) -> Result<(), ffi::ResultTestTransparentStruct> {\r\n    if succeed {\r\n        Ok(())\r\n    } else {\r\n        Err(ffi::ResultTestTransparentStruct(\"failed\".to_string()))\r\n    }\r\n}\r\n\r\nimpl std::error::Error for ffi:: TransparentErrorStruct {}\r\n\r\nimpl std::fmt::Debug for ffi:: TransparentErrorStruct {\r\n    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\r\n        write!(f, \"{}\", self)\r\n    }\r\n}\r\n\r\nimpl std::fmt::Display for ffi:: TransparentErrorStruct {\r\n    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {\r\n        write!(f, \"{}\", self.0)\r\n    }\r\n}\r\n```","shortMessageHtmlLink":"Suppress dead_code warning when returning `-&gt; Result&lt;*, 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`add_custom_target` API).\r\n\r\n## Notes\r\n\r\nOne caveat of the current implementation is that one would have to duplicate the crate name in the invocation line (the first argument).\r\n\r\nThis is fine for cases like mine, where this would be taken from the build system anyway, but it may not be handy for other cases.\r\n\r\nThe package name can be automatically deduced if one's running in the correct directory (the package root).\r\nIn this case, we can parse the `cargo read-manifest` output and get the name from there.\r\n\r\nThis would require a new dependency, though (`serde_json`), so I decided not to do this just yet, but if this sounds okay to you, I'll go ahead and implement this as well.\r\n\r\n## Examples\r\n\r\nSingle file:\r\n```shell\r\nswift-bridge-cli parse-bridges --crate-name my-awesome-crate -f src/lib.rs -o generated\r\n```\r\n\r\nMultiple files:\r\n```shell\r\nswift-bridge-cli parse-bridges --crate-name my-superb-crate \\\r\n-f src/lib.rs \\\r\n-f src/some_other_file.rs \\\r\n-o generated\r\n```","shortMessageHtmlLink":"Add parse-bridges CLI subcommand (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2290484037\" data-permission-text=\"Title is private\" data-url=\"https://github.com/chinedufn/swift-bridge/issues/274\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/chinedufn/swift-bridge/pull/274/hovercard\" href=\"https://github.com/chinedufn/swift-bridge/pull/274\">#274</a>)"}},{"before":"87dbea3c28d4a96d9195bd3a70fdecfd85fd8f5c","after":"ef01d21001914b79e0384627535098e15f87f096","ref":"refs/heads/master","pushedAt":"2024-04-29T03:20:19.000Z","pushType":"push","commitsCount":1,"pusher":{"login":"chinedufn","name":"Chinedu Francis 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`Option<SwiftType>` to\r\n`extern \"Rust\"` functions.\r\n\r\nFor example, the following bridge module would lead to memory leaks:\r\n\r\n```rust\r\n#[swift_bridge::bridge]\r\nmod ffi {\r\n    extern \"Swift\" {\r\n        type SomeSwiftType;\r\n    }\r\n\r\n    extern \"Rust\" {\r\n        fn rust_fn_takes_swift_type(arg: Option<SomeSwiftType>);\r\n    }\r\n}\r\n```\r\n\r\nWhen the above `rust_fn_takes_swift_type` function was called the\r\n`SomeSwiftType` would be retained twice.\r\n\r\nWhen the Rust side later freed `SomeSwiftType` the retain count would\r\ndrop from 2 to 1.\r\n\r\nSince there was still 1 retain, `SomeSwiftType` would never get freed.\r\n\r\n## Impact\r\n\r\nSupport for passing `Option<SomeSwiftType>` from Swift to Rust was\r\nintroduced earlier today.\r\n\r\nThis functionality was released in `swift-bridge = \"0.1.54\"`.\r\n\r\nW will be deploying `swift-bridge = \"0.1.55\" today. \"0.1.55\" will\r\ncontain a fix for the leak.\r\n\r\nBecause support for `Option<SomeSwiftType>` was released today, and the\r\nfix will be released today, it should be unlikely that anyone has\r\nexperienced this leak.\r\n\r\nWe will yank \"0.1.54\" from \"crates.io\".\r\n\r\nAll users (probably zero) that are bridging `Option<SomeSwiftType>` should\r\nupgrade from \"0.1.54\" to \"0.1.55\" to.\r\n\r\n## Solution\r\n\r\nThis commit does the following:\r\n\r\n- When passing ownership of a Swift type from Swift to Rust we now\r\n  increment the retain count by one. Before this commit we were\r\n  incrementing it by two.\r\n\r\n- When passing ownership of a Swift type from Rust to Swift we avoid\r\n  calling the the Rust handle's `Drop` implementation. We avoid this by\r\n  using `std::mem::forget`.\r\n  This ensures that the retain count does not get decremented.\r\n\r\n- When passing ownership of a Swift type from Rust to Swift the Swift\r\n  side does not increment the retain count.\r\n\r\nWith all of the above we should now be able to:\r\n\r\n- Create an `Option<SwiftType>` Swift type on the Swift side\r\n\r\n- Pass ownership of the `Option<SwiftType> to Rust. The retain count is now 1.\r\n\r\n- Pass ownership back to Swift. The retain count is still 1.\r\n\r\nBefore this commit, when passing an `Option<SwiftType>` it was:\r\n\r\n- Create a Swift type on the Swift side\r\n\r\n- Pass `Option<SwiftType>` to Rust. Retain count is now 2\r\n\r\n- Rust passes ownership back to Swift. Retain count is now 1\r\n\r\n- Retain count never hits 0. Memory has been leaked.","shortMessageHtmlLink":"Fix memory leak for <code>Option&lt;SwiftType&gt;</code> (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2268031856\" data-permission-text=\"Title is private\" data-url=\"https://github.com/chinedufn/swift-bridge/issues/273\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/chinedufn/swift-bridge/pull/273/hovercard\" href=\"https://github.com/chinedufn/swift-bridge/pull/273\">#273</a>)"}},{"before":null,"after":"292e25a23a5d841c9715a392110e9e1620fe5951","ref":"refs/heads/fix-mem-leak","pushedAt":"2024-04-29T03:07:44.000Z","pushType":"branch_creation","commitsCount":0,"pusher":{"login":"chinedufn","name":"Chinedu Francis Nwafili","path":"/chinedufn","primaryAvatarUrl":"https://avatars.githubusercontent.com/u/2099811?s=80&v=4"},"commit":{"message":"Fix memory leak for `Option<SwiftType>`\n\nThis commit fixes a memory leak when passing `Option<SwiftType>` to\n`extern \"Rust\"` functions.\n\nFor example, the following bridge module would lead to memory leaks:\n\n```rust\n#[swift_bridge::bridge]\nmod ffi {\n    extern \"Swift\" {\n        type SomeSwiftType;\n    }\n\n    extern \"Rust\" {\n        fn rust_fn_takes_swift_type(arg: Option<SomeSwiftType>);\n    }\n}\n```\n\nWhen the above `rust_fn_takes_swift_type` function was called the\n`SomeSwiftType` would be retained twice.\n\nWhen the Rust side later freed `SomeSwiftType` the retain count would\ndrop from 2 to 1.\n\nSince there was still 1 retain, `SomeSwiftType` would never get freed.\n\n## Impact\n\nSupport for passing `Option<SomeSwiftType>` from Swift to Rust was\nintroduced earlier today.\n\nThis functionality was released in `swift-bridge = \"0.1.54\"`.\n\nW will be deploying `swift-bridge = \"0.1.55\" today. \"0.1.55\" will\ncontain a fix for the leak.\n\nBecause support for `Option<SomeSwiftType>` was released today, and the\nfix will be released today, it should be unlikely that anyone has\nexperienced this leak.\n\nWe will yank \"0.1.54\" from \"crates.io\".\n\nAll users (probably zero) that are bridging `Option<SomeSwiftType>` should\nupgrade from \"0.1.54\" to \"0.1.55\" to.\n\n## Solution\n\nThis commit does the following:\n\n- When passing ownership of a Swift type from Swift to Rust we now\n  increment the retain count by one. Before this commit we were\n  incrementing it by two.\n\n- When passing ownership of a Swift type from Rust to Swift we avoid\n  calling the the Rust handle's `Drop` implementation. We avoid this by\n  using `std::mem::forget`.\n  This ensures that the retain count does not get decremented.\n\n- When passing ownership of a Swift type from Rust to Swift the Swift\n  side does not increment the retain count.\n\nWith all of the above we should now be able to:\n\n- Create an `Option<SwiftType>` Swift type on the Swift side\n\n- Pass ownership of the `Option<SwiftType> to Rust. The retain count is now 1.\n\n- Pass ownership back to Swift. The retain count is still 1.\n\nBefore this commit, when passing an `Option<SwiftType>` it was:\n\n- Create a Swift type on the Swift side\n\n- Pass `Option<SwiftType>` to Rust. Retain count is now 2\n\n- Rust passes ownership back to Swift. Retain count is now 1\n\n- Retain count never hits 0. 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