# winrt Shared C+ ownership and ABI support for Windows Runtime projections. It has no WinUI or Facet dependency. The current implementation targets Windows x64. ```toml [dependencies] stdlib = "*" winrt = "*" ``` ```cplus import "winrt/runtime" as rt; // HString::new converts UTF-8 and returns Result[HString, Error]. // Owned HString and Object values release their handles on drop. ``` [Tutorial](https://github.com/netdur/cplus/blob/v0.0.30/vendor/winrt/docs/tutorial.md) · [Guide](https://github.com/netdur/cplus/blob/v0.0.30/vendor/winrt/docs/guide.md) · [Reference](https://github.com/netdur/cplus/blob/v0.0.30/vendor/winrt/docs/ref.md) Run `cpc test --filter winrt_` from this package on Windows. Unit tests are in `src/runtime.cplus`; `src/winrt.cplus` is the test discovery root. The generated [WinUI sample](https://github.com/netdur/cplus/tree/v0.0.30/examples/winui_standalone) covers native activation, composition, delegates, and shutdown end to end. Generated delegates expose `boxed()` for APIs such as WinUI `AddHandler` that accept an inspectable object. The runtime owns the delegate through a typed `IReference` box; ordinary typed event subscriptions still use `object()`. Keep the box for `RemoveHandler`, and keep the borrowed callback context alive until removal. Boxing does not make a delegate agile. A generated delegate whose first parameter is an object (an event's sender) records that sender around its callback. After `track_events()` on a thread, `event_sender()` there answers the sender of the innermost event being delivered, or null; other threads are not tracked. The pointer is borrowed for the callback's duration. facet_winui uses it to find the window that asked for an alert.