From bb969ed4193e2eadabfaa0dfd0b94312b6146349 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Wed, 25 Mar 2009 00:34:44 +0000
Subject: [PATCH] Template instantiation for conversion functions

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67664 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Sema/SemaTemplateInstantiateDecl.cpp | 31 ++++++++++++++++++++++++
 test/SemaTemplate/instantiate-method.cpp | 11 +++++++++
 2 files changed, 42 insertions(+)

diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 4738dfbd8e..97fd2ed5f4 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -46,6 +46,7 @@ namespace {
     Decl *VisitCXXMethodDecl(CXXMethodDecl *D);
     Decl *VisitCXXConstructorDecl(CXXConstructorDecl *D);
     Decl *VisitCXXDestructorDecl(CXXDestructorDecl *D);
+    Decl *VisitCXXConversionDecl(CXXConversionDecl *D);
     Decl *VisitParmVarDecl(ParmVarDecl *D);
     Decl *VisitOriginalParmVarDecl(OriginalParmVarDecl *D);
 
@@ -320,6 +321,36 @@ Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
   return Destructor;
 }
 
+Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) {
+  llvm::SmallVector<ParmVarDecl *, 16> Params;
+  QualType T = InstantiateFunctionType(D, Params);
+  if (T.isNull())
+    return 0;
+  assert(Params.size() == 0 && "Destructor with parameters?");
+
+  // Build the instantiated conversion declaration.
+  CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner);
+  QualType ClassTy = SemaRef.Context.getTypeDeclType(Record);
+  QualType ConvTy 
+    = SemaRef.Context.getCanonicalType(T->getAsFunctionType()->getResultType());
+  CXXConversionDecl *Conversion
+    = CXXConversionDecl::Create(SemaRef.Context, Record,
+                                D->getLocation(),
+         SemaRef.Context.DeclarationNames.getCXXConversionFunctionName(ConvTy),
+                                T, D->isInline(), D->isExplicit());
+  if (InitMethodInstantiation(Conversion, D))
+    Conversion->setInvalidDecl();
+
+  bool Redeclaration = false;
+  bool OverloadableAttrRequired = false;
+  NamedDecl *PrevDecl = 0;
+  if (SemaRef.CheckFunctionDeclaration(Conversion, PrevDecl, Redeclaration,
+                                       /*FIXME:*/OverloadableAttrRequired))
+    Conversion->setInvalidDecl();
+  Owner->addDecl(Conversion);
+  return Conversion;  
+}
+
 Decl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) {
   QualType OrigT = SemaRef.InstantiateType(D->getOriginalType(), TemplateArgs,
                                            NumTemplateArgs, D->getLocation(),
diff --git a/test/SemaTemplate/instantiate-method.cpp b/test/SemaTemplate/instantiate-method.cpp
index 3a52c62d69..daea7465dc 100644
--- a/test/SemaTemplate/instantiate-method.cpp
+++ b/test/SemaTemplate/instantiate-method.cpp
@@ -61,3 +61,14 @@ void test_constructors() {
   Constructors<int> ci1(17);
   Constructors<int> ci2 = ci1;
 }
+
+
+template<typename T>
+struct ConvertsTo {
+  operator T();
+};
+
+void test_converts_to(ConvertsTo<int> ci, ConvertsTo<int *> cip) {
+  int i = ci;
+  int *ip = cip;
+}
-- 
2.40.0