1 files changed, 78 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/ext/is_empty.C b/gcc/testsuite/g++.dg/ext/is_empty.C
new file mode 100644
index 000000000..4c58941b3
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/is_empty.C
@@ -0,0 +1,78 @@
+// { dg-do run }
+#include <cassert>
+
+struct A
+{
+  double a;
+  double b;
+};
+
+struct B
+{
+  virtual ~B() { }
+};
+
+class C 
+{ };
+
+union U
+{ };
+
+template<typename T>
+  bool
+  f()
+  { return __is_empty(T); } 
+
+template<typename T>
+  class My
+  {
+  public:
+    bool
+    f()
+    { return !!__is_empty(T); }
+  };
+
+template<typename T>
+  class My2
+  {
+  public:
+    static const bool trait = __is_empty(T);
+  };
+
+template<typename T>
+  const bool My2<T>::trait;
+
+template<typename T, bool b = __is_empty(T)>
+  struct My3_help
+  { static const bool trait = b; };
+
+template<typename T, bool b>
+  const bool My3_help<T, b>::trait;
+
+template<typename T>
+  class My3
+  {
+  public:
+    bool
+    f()
+    { return My3_help<T>::trait; }
+  };
+
+#define PTEST(T) (__is_empty(T) && f<T>() \
+                  && My<T>().f() && My2<T>::trait && My3<T>().f())
+
+#define NTEST(T) (!__is_empty(T) && !f<T>() \
+                  && !My<T>().f() && !My2<T>::trait && !My3<T>().f())
+
+int main()
+{
+  assert (NTEST (int));
+  assert (NTEST (void));
+  assert (NTEST (A));
+  assert (NTEST (B));
+  assert (PTEST (C));
+  assert (NTEST (C[]));
+  assert (NTEST (U));
+
+  return 0;
+}