New program for testing decltype() (a C++0x feature).

Installation/config/testfiles/CGAL_CFG_NO_DECLTYPE.cpp

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+// Copyright (c) 2008  INRIA Sophia-Antipolis (France).
+// All rights reserved.
+//
+// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation; version 2.1 of the License.
+// See the file LICENSE.LGPL distributed with CGAL.
+//
+// Licensees holding a valid commercial license may use this file in
+// accordance with the commercial license agreement provided with the software.
+//
+// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+//
+// $URL$
+// $Id$
+//
+// Author(s)     : Sylvain Pion
+
+// ---------------------------------------------------------------------
+// A short test program to evaluate a C++ compiler.
+// This program is used by install_cgal.
+// The following documentation will be pasted in the generated configfile.
+// ---------------------------------------------------------------------
+
+//| If a compiler does not support decltype() (from C++0x)
+//| CGAL_CFG_NO_DECLTYPE is set. 
+
+void use(int) {}
+
+int main()
+{
+  int i = 2;
+  decltype(i+i) j = 3;
+  use(j);
+  return 0;
+}