================
@@ -6027,6 +6027,33 @@ static bool EvaluateBinaryTypeTrait(Sema &Self,
TypeTrait BTT, const TypeSourceI
return cast<CXXRecordDecl>(rhsRecord->getDecl())
->isDerivedFrom(cast<CXXRecordDecl>(lhsRecord->getDecl()));
}
+ case BTT_IsVirtualBaseOf: {
+ const RecordType *BaseRecord = LhsT->getAs<RecordType>();
+ const RecordType *DerivedRecord = RhsT->getAs<RecordType>();
+
+ if (!BaseRecord || !DerivedRecord) {
+ DiagnoseVLAInCXXTypeTrait(Self, Lhs, tok::kw___is_virtual_base_of);
+ DiagnoseVLAInCXXTypeTrait(Self, Rhs, tok::kw___is_virtual_base_of);
+ return false;
+ }
+
+ if (BaseRecord->isUnionType() || DerivedRecord->isUnionType())
+ return false;
+
+ if (!BaseRecord->isStructureOrClassType() ||
+ !DerivedRecord->isStructureOrClassType())
+ return false;
+
+ if (Self.RequireCompleteType(Rhs->getTypeLoc().getBeginLoc(), RhsT,
----------------
AaronBallman wrote:
I hadn't realized that `is_base_of` already has the same requirement, so I
don't insist on a change here. But that said, this presumes users don't have
typos they'd like to catch. e.g.,
```
struct Bee { };
struct Be;
struct Derived : virtual Bee {};
static_assert(!__is_virtual_base_of(Be, Derived)); // Oops, I can't spell very
well!
```
I think it would be *much* kinder to tell the user that `Be` is incomplete than
let them be surprised.
https://github.com/llvm/llvm-project/pull/100393
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