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+// file : libcutl/meta/polymorphic-p.hxx
+// license : MIT; see accompanying LICENSE file
+
+#ifndef LIBCUTL_META_POLYMORPHIC_HXX
+#define LIBCUTL_META_POLYMORPHIC_HXX
+
+#include <libcutl/meta/class-p.hxx>
+#include <libcutl/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 () noexcept;
+ };
+
+ static const bool r = sizeof (t1) == sizeof (t2);
+ };
+
+ static const bool r = impl<X, class_p<X>::r>::r;
+ };
+ }
+}
+
+#endif // LIBCUTL_META_POLYMORPHIC_HXX