Equate alias declarations and typedef in templates

Typedefs are exempted from IWYU checks in templates, so treat C++11
alias declarations the same.

(side note: this behavior is broken, but at least now it's consistent)

Fixes issue #412.

3 files changed, 9 insertions, 1 deletions

diff --git a/iwyu.cc b/iwyu.cc
index 1c4297a..196a574 100644
--- a/iwyu.cc
+++ b/iwyu.cc
@@ -205,6 +205,7 @@ using clang::TranslationUnitDecl;
 using clang::Type;
 using clang::TypeLoc;
 using clang::TypedefDecl;
+using clang::TypedefNameDecl;
 using clang::TypedefType;
 using clang::UnaryExprOrTypeTraitExpr;
 using clang::UsingDecl;
@@ -3042,7 +3043,7 @@ class InstantiatedTemplateVisitor
     // you do 'Foo<MyClass>::value_type m;'?
     for (const ASTNode* ast_node = current_ast_node();
          ast_node != caller_ast_node_; ast_node = ast_node->parent()) {
-      if (ast_node->IsA<TypedefDecl>())
+      if (ast_node->IsA<TypedefNameDecl>())
         return Base::VisitSubstTemplateTypeParmType(type);
     }
 
diff --git a/run_iwyu_tests.py b/run_iwyu_tests.py
index b0252ab..6e36c04 100755
--- a/run_iwyu_tests.py
+++ b/run_iwyu_tests.py
@@ -106,6 +106,7 @@ class OneIwyuTest(unittest.TestCase):
       'prefix_header_includes_add.cc': prefix_headers,
       'prefix_header_includes_keep.cc': prefix_headers,
       'prefix_header_includes_remove.cc': prefix_headers,
+      'typedef_in_template.cc': ['-std=c++11'],
     }
     include_map = {
       'alias_template.cc': ['.'],
diff --git a/tests/cxx/typedef_in_template.cc b/tests/cxx/typedef_in_template.cc
index 5e5dacc..48721d7 100644
--- a/tests/cxx/typedef_in_template.cc
+++ b/tests/cxx/typedef_in_template.cc
@@ -15,6 +15,9 @@ class Container {
   // Should not be an iwyu violation for T
   typedef T value_type;
 
+  // C++11 alias declaration, should not be an iwyu violation for T
+  using alias_type = T;
+
   // IWYU: Pair is...*typedef_in_template-i1.h
   typedef Pair<T,T> pair_type;
 };
@@ -34,6 +37,9 @@ void Declarations() {
 
   // IWYU: Class needs a declaration
   Container<Class>::pair_type pt;
+
+  // IWYU: Class needs a declaration
+  Container<Class>::alias_type at;
 }