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Allow conversion between T* and Cpp.void*. (#6575)

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Support an implicit conversion from `T*` to `Cpp.void*` and to `const
Cpp.void*`, and an `unsafe as` conversion in the opposite direction.

In order to support C++ calls taking and returning `void*` (which get
mapped to Carbon `Optional(Cpp.void*)`, also support conversions from
`Optional(T)` to `Optional(U)` if there's a conversion from `T` to `U`.

Fix a bug in `OptionalStorage` for `T*` where its `HasValue` was exactly
backwards.
This commit is contained in:
Richard Smith
2026-01-12 16:32:15 +00:00
committed by GitHub
parent d1b13194d5
commit 31919afa24
31 changed files with 986 additions and 381 deletions
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toolchain/check/testdata/interop/cpp/void.carbon
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@@ -30,7 +30,7 @@ fn G() {
// CHECK:STDERR: fail_void_abstract.carbon:[[@LINE+7]]:10: error: binding pattern has abstract type `Cpp.void` in `var` pattern [AbstractTypeInVarPattern]
// CHECK:STDERR: var x: Cpp.void;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: {{.*}}/prelude/types/cpp/void.carbon:22:1: note: class was declared abstract here [ClassAbstractHere]
// CHECK:STDERR: {{.*}}/prelude/types/cpp/void.carbon:24:1: note: class was declared abstract here [ClassAbstractHere]
// CHECK:STDERR: abstract class CppCompat.VoidBase {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: