Several improvements to template argument deduction:

  - Once we have deduced template arguments for a class template partial
    specialization, we use exactly those template arguments for instantiating
    the definition of the class template partial specialization.
  - Added template argument deduction for non-type template parameters.
  - Added template argument deduction for dependently-sized array types.

With these changes, we can now implement, e.g., the remove_reference
type trait. Also, Daniel's Ackermann template metaprogram now compiles
properly.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72909 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 23 insertions, 0 deletions

diff --git a/test/SemaTemplate/temp_class_spec.cpp b/test/SemaTemplate/temp_class_spec.cpp
index d516f01d7f..8cb46cf98f 100644
--- a/test/SemaTemplate/temp_class_spec.cpp
+++ b/test/SemaTemplate/temp_class_spec.cpp
@@ -51,6 +51,19 @@ int is_same2[is_same<const int, int>::value? -1 : 1];
 int is_same3[is_same<int_ptr, int>::value? -1 : 1];
 
 template<typename T>
+struct remove_reference {
+  typedef T type;
+};
+
+template<typename T>
+struct remove_reference<T&> {
+  typedef T type;
+};
+
+int remove_ref0[is_same<remove_reference<int>::type, int>::value? 1 : -1];
+int remove_ref1[is_same<remove_reference<int&>::type, int>::value? 1 : -1];
+                
+template<typename T>
 struct is_incomplete_array {
   static const bool value = false;
 };
@@ -79,3 +92,13 @@ int array_with_4_elements0[is_array_with_4_elements<int[]>::value ? -1 : 1];
 int array_with_4_elements1[is_array_with_4_elements<int[1]>::value ? -1 : 1];
 int array_with_4_elements2[is_array_with_4_elements<int[4]>::value ? 1 : -1];
 int array_with_4_elements3[is_array_with_4_elements<int[4][2]>::value ? 1 : -1];
+
+template<typename T>
+struct get_array_size;
+
+template<typename T, unsigned N>
+struct get_array_size<T[N]> {
+  static const unsigned value = N;
+};
+
+int array_size0[get_array_size<int[12]>::value == 12? 1 : -1];