Imported Upstream version 4.0.0upstream/4.0.0

1 files changed, 50 insertions, 0 deletions

diff --git a/libcutl/cutl/meta/polymorphic-p.hxx b/libcutl/cutl/meta/polymorphic-p.hxx
new file mode 100644
index 0000000..dd820db
--- /dev/null
+++ b/libcutl/cutl/meta/polymorphic-p.hxx
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+// file      : cutl/meta/polymorphic-p.hxx
+// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef CUTL_META_POLYMORPHIC_HXX
+#define CUTL_META_POLYMORPHIC_HXX
+
+#include <cutl/meta/class-p.hxx>
+#include <cutl/meta/remove-cv.hxx>
+
+namespace cutl
+{
+  namespace meta
+  {
+    template <typename CVX>
+    struct polymorphic_p
+    {
+      typedef typename remove_cv<CVX>::r X;
+
+      template <typename Y, bool C>
+      struct impl
+      {
+        static const bool r = false;
+      };
+
+      template <typename Y>
+      struct impl<Y, true>
+      {
+        struct t1: Y
+        {
+          t1 ();
+        };
+
+        struct t2: Y
+        {
+          t2 ();
+
+          virtual
+          ~t2 () throw ();
+        };
+
+        static const bool r = sizeof (t1) == sizeof (t2);
+      };
+
+      static const bool r = impl<X, class_p<X>::r>::r;
+    };
+  }
+}
+
+#endif // CUTL_META_POLYMORPHIC_HXX