[PATCH] D28671: [ASTMatchers] add typeAliasTemplateDecl matcher.

[Eric Liu via Phabricator via cfe-commits]

ioeric created this revision.
ioeric added a reviewer: hokein.
ioeric added a subscriber: cfe-commits.
Herald added a subscriber: klimek.

https://reviews.llvm.org/D28671

Files:
  include/clang/ASTMatchers/ASTMatchers.h
  unittests/ASTMatchers/ASTMatchersNodeTest.cpp


Index: unittests/ASTMatchers/ASTMatchersNodeTest.cpp
===================================================================
--- unittests/ASTMatchers/ASTMatchersNodeTest.cpp
+++ unittests/ASTMatchers/ASTMatchersNodeTest.cpp
@@ -1494,6 +1494,22 @@
                       typedefNameDecl(hasName("typedefNameDeclTest2"))));
 }
 
+TEST(TypeAliasTemplateDeclMatcher, Match) {
+  std::string Code = R"(
+    template <typename T>
+    class X { T t; };
+
+    template <typename T>
+    using typeAliasTemplateDecl = X<T>;
+
+    using typeAliasDecl = X<int>;
+  )";
+  EXPECT_TRUE(
+      matches(Code, typeAliasTemplateDecl(hasName("typeAliasTemplateDecl"))));
+  EXPECT_TRUE(
+      notMatches(Code, typeAliasTemplateDecl(hasName("typeAliasDecl"))));
+}
+
 TEST(ObjCMessageExprMatcher, SimpleExprs) {
   // don't find ObjCMessageExpr where none are present
   EXPECT_TRUE(notMatchesObjC("", objcMessageExpr(anything())));
Index: include/clang/ASTMatchers/ASTMatchers.h
===================================================================
--- include/clang/ASTMatchers/ASTMatchers.h
+++ include/clang/ASTMatchers/ASTMatchers.h
@@ -180,6 +180,16 @@
 ///   matches "using Y = int", but not "typedef int X"
 const internal::VariadicDynCastAllOfMatcher<Decl, TypeAliasDecl> typeAliasDecl;
 
+/// \brief Matches type alias template declarations.
+///
+/// typeAliasTemplateDecl() matches
+/// \code
+///   template <typename T>
+///   using Y = X<T>;
+/// \endcode
+const internal::VariadicDynCastAllOfMatcher<Decl, TypeAliasTemplateDecl>
+    typeAliasTemplateDecl;
+
 /// \brief Matches AST nodes that were expanded within the main-file.
 ///
 /// Example matches X but not Y


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