Implement partial ordering of class template partial specializations

(C++ [temp.class.order]).

llvm-svn: 81866

1 files changed, 42 insertions, 0 deletions

diff --git a/clang/test/SemaTemplate/temp_class_order.cpp b/clang/test/SemaTemplate/temp_class_order.cpp
new file mode 100644
index 00000000000..4687ddf7d9e
--- /dev/null
+++ b/clang/test/SemaTemplate/temp_class_order.cpp
@@ -0,0 +1,42 @@
+// RUN: clang-cc -fsyntax-only -verify %s
+
+template<typename T, typename U>
+struct X1 {
+  static const int value = 0;
+};
+
+template<typename T, typename U>
+struct X1<T*, U*> {
+  static const int value = 1;
+};
+
+template<typename T>
+struct X1<T*, T*> {
+  static const int value = 2;
+};
+
+template<typename T>
+struct X1<const T*, const T*> {
+  static const int value = 3;
+};
+
+int array0[X1<int, int>::value == 0? 1 : -1];
+int array1[X1<int*, float*>::value == 1? 1 : -1];
+int array2[X1<int*, int*>::value == 2? 1 : -1];
+typedef const int* CIP;
+int array3[X1<const int*, CIP>::value == 3? 1 : -1];
+
+template<typename T, typename U>
+struct X2 { };
+
+template<typename T, typename U>
+struct X2<T*, U> { }; // expected-note{{matches}}
+
+template<typename T, typename U>
+struct X2<T, U*> { }; // expected-note{{matches}}
+
+template<typename T, typename U>
+struct X2<const T*, const U*> { };
+
+X2<int*, int*> x2a; // expected-error{{ambiguous}}
+X2<const int*, const int*> x2b;