mirror of https://github.com/CGAL/cgal
53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
// Copyright (c) 1999,2003 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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//
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//
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// Author(s) : Sylvain Pion
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#ifndef CGAL_QUALIFIED_RESULT_OF_H
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#define CGAL_QUALIFIED_RESULT_OF_H
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#include <boost/type_traits.hpp>
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CGAL_BEGIN_NAMESPACE
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struct Has_qrt {};
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template < typename F, bool b >
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struct qrt_or_not
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{ typedef typename F::result_type type; };
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template < typename F >
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struct qrt_or_not <F, true>
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{ typedef const typename F::result_type & type; };
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template <typename Functor, typename P1 = void, typename P2 = void,
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typename P3 = void, typename P4 = void,
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typename P5 = void, typename P6 = void,
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typename P7 = void, typename P8 = void>
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struct Qualified_result_of
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: qrt_or_not<Functor, boost::is_base_and_derived<Has_qrt, Functor>::value>
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{};
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CGAL_END_NAMESPACE
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#endif // CGAL_QUALIFIED_RESULT_OF_H
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