[c++1z] Enforce restriction that deduction guide is declared in the same scope as its template.
llvm-svn: 294778
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 9d9d127..dd2dfe4 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -242,6 +242,37 @@
return TemplateKind;
}
+bool Sema::isDeductionGuideName(Scope *S, const IdentifierInfo &Name,
+ SourceLocation NameLoc,
+ ParsedTemplateTy *Template) {
+ CXXScopeSpec SS;
+ bool MemberOfUnknownSpecialization = false;
+
+ // We could use redeclaration lookup here, but we don't need to: the
+ // syntactic form of a deduction guide is enough to identify it even
+ // if we can't look up the template name at all.
+ LookupResult R(*this, DeclarationName(&Name), NameLoc, LookupOrdinaryName);
+ LookupTemplateName(R, S, SS, /*ObjectType*/QualType(),
+ /*EnteringContext*/false, MemberOfUnknownSpecialization);
+
+ if (R.empty()) return false;
+ if (R.isAmbiguous()) {
+ // FIXME: Diagnose an ambiguity if we find at least one template.
+ R.suppressDiagnostics();
+ return false;
+ }
+
+ // We only treat template-names that name type templates as valid deduction
+ // guide names.
+ TemplateDecl *TD = R.getAsSingle<TemplateDecl>();
+ if (!TD || !getAsTypeTemplateDecl(TD))
+ return false;
+
+ if (Template)
+ *Template = TemplateTy::make(TemplateName(TD));
+ return true;
+}
+
bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II,
SourceLocation IILoc,
Scope *S,