Add test for composable type authoring support #3259
Merged
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This tests that
windows-bindgen
can generate bindings andwindows-rs
in general can support implementing and consuming closed composable type systems. A closed type system, at least in the simpler MIDL3 dialect, is distinguished by the lack of any constructors on "unsealed" classes and instead depends on static methods for internal construction thus preventing binary (open) composition.Note that
windows-rs
has long supported closed composable type systems like Windows.UI.Composition - this is specifically testing its ability to implement such APIs.A Rust implementation is provided for a "Windows.UI.Composition"-inspired API and consumption is tested both in C++ and Rust.
This uncovered two warts that I'll address soon: #3257 #3258