================
@@ -10598,10 +10598,34 @@ QualType
Sema::DeduceTemplateSpecializationFromInitializer(
if (TemplateName.isDependent())
return SubstAutoTypeDependent(TSInfo->getType());
- // We can only perform deduction for class templates.
+ // We can only perform deduction for class templates or alias templates.
auto *Template =
dyn_cast_or_null<ClassTemplateDecl>(TemplateName.getAsTemplateDecl());
+ TemplateDecl* LookupTemplateDecl = Template;
+ if (!Template && getLangOpts().CPlusPlus20) { // type alias template
+ if (auto *AliasTemplate = dyn_cast_or_null<TypeAliasTemplateDecl>(
+ TemplateName.getAsTemplateDecl());
+ AliasTemplate) {
+ LookupTemplateDecl = AliasTemplate;
+ auto UnderlyingType = AliasTemplate->getTemplatedDecl()
+ ->getUnderlyingType()
+ .getDesugaredType(Context);
+ if (const auto *TST =
+ UnderlyingType->getAs<TemplateSpecializationType>()) {
+ Template = dyn_cast_or_null<ClassTemplateDecl>(
+ TST->getTemplateName().getAsTemplateDecl());
+ } else if (const auto *RT = UnderlyingType->getAs<RecordType>()) {
+ // Cases where template arguments in the RHS of the alias are not
+ // dependent. e.g.
+ // using AliasFoo = Foo<bool>;
+ if (const auto *CTSD = llvm::dyn_cast<ClassTemplateSpecializationDecl>(
+ RT->getAsCXXRecordDecl()))
+ Template = CTSD->getSpecializedTemplate();
+ }
----------------
cor3ntin wrote:
I don't see it
https://github.com/llvm/llvm-project/pull/77890
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