Extend struct-typed constants onto their struct under extensionReceiver - #1743
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Jevan Saks (jevansaks) merged 1 commit intoJul 14, 2026
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When `extensionReceiver` is configured, a constant typed as a typedef struct (HRESULT, NTSTATUS, HWND, BOOL, HKEY, ...) whose struct is owned by a referenced assembly is now attached to that struct through a C# 14 `extension(<Struct>)` block, so it reads as `<Struct>.<Name>` -- matching how the owning assembly surfaces its own constants of that type. Previously these constants only reached the host constants class. Details: * Decoupled from receiver resolvability: a cross-namespace extender whose own receiver (e.g. Windows.Wdk.PInvoke) does not resolve still attaches constants to a resolvable struct such as Windows.Win32.Foundation.NTSTATUS. * When the struct is generated in the same assembly it is injected directly as before (no extension block). * Deduped against the struct's existing members so a lower layer that already exposes the constant is not duplicated. * Silent fallback to the host class when the struct is not in any referenced assembly. Adds unit tests (attach-to-struct-not-receiver, dedup, local-injection-unchanged, compiles-under-C#14) and documents the behavior in composition.md.
Jevan Saks (jevansaks)
approved these changes
Jul 14, 2026
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When
extensionReceiveris configured, a constant typed as a typedef struct (HRESULT, NTSTATUS, HWND, BOOL, HKEY, ...) whose struct is owned by a referenced assembly is now attached to that struct through a C# 14extension(<Struct>)block, so it reads as<Struct>.<Name>-- matching how the owning assembly surfaces its own constants of that type. Previously these constants only reached the host constants class.Details:
Decoupled from receiver resolvability: a cross-namespace extender whose own receiver (e.g. Windows.Wdk.PInvoke) does not resolve still attaches constants to a resolvable struct such as Windows.Win32.Foundation.NTSTATUS.
When the struct is generated in the same assembly it is injected directly as before (no extension block).
Deduped against the struct's existing members so a lower layer that already exposes the constant is not duplicated.
Silent fallback to the host class when the struct is not in any referenced assembly.
Adds unit tests (attach-to-struct-not-receiver, dedup, local-injection-unchanged, compiles-under-C#14) and documents the behavior in composition.md.