1 files changed, 28 insertions, 0 deletions
diff --git a/odb/meta/class-p.hxx b/odb/meta/class-p.hxx
new file mode 100644
index 0000000..e3d15c9
--- /dev/null
+++ b/odb/meta/class-p.hxx
@@ -0,0 +1,28 @@
+// file      : odb/meta/class-p.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_META_CLASS_HXX
+#define ODB_META_CLASS_HXX
+
+#include <odb/meta/answer.hxx>
+
+namespace odb
+{
+  namespace meta
+  {
+    // g++ cannot have these inside class_p.
+    //
+    template <typename Y> no class_p_test (...);
+    template <typename Y> yes class_p_test (void (Y::*) ());
+
+    template <typename X>
+    struct class_p
+    {
+      static bool const r = sizeof (class_p_test<X> (0)) == sizeof (yes);
+    };
+  }
+}
+
+#endif // ODB_META_CLASS_HXX