Fix PR32097 - is_abstract doesn't work on class templates.

This patch fixes llvm.org/PR32097 by using the __is_abstract
builtin type-trait instead of the previous library-only implementation.

All supported compilers provide this trait. I've tested as far
back as Clang 3.2, GCC 4.6 and MSVC trunk.

llvm-svn: 296561

1 files changed, 10 insertions, 0 deletions

diff --git a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_abstract.pass.cpp b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_abstract.pass.cpp
index a54adf10258..99ca74cc2fa 100644
--- a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_abstract.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_abstract.pass.cpp
@@ -65,6 +65,14 @@ class Abstract
     virtual ~Abstract() = 0;
 };
 
+template <class>
+struct AbstractTemplate {
+  virtual void test() = 0;
+};
+
+template <>
+struct AbstractTemplate<double> {};
+
 int main()
 {
     test_is_not_abstract<void>();
@@ -81,4 +89,6 @@ int main()
     test_is_not_abstract<NotEmpty>();
 
     test_is_abstract<Abstract>();
+    test_is_abstract<AbstractTemplate<int> >();
+    test_is_not_abstract<AbstractTemplate<double> >();
 }