57 lines
1.6 KiB
C++
Executable File
57 lines
1.6 KiB
C++
Executable File
// Copyright (c) 2007,2009 INRIA Sophia-Antipolis (France). 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; either version 3 of the License,
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// or (at your option) any later version.
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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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// SPDX-License-Identifier: LGPL-3.0+
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//
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// Author(s) : Sylvain Pion
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#ifndef CGAL_DEFAULT_H
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#define CGAL_DEFAULT_H
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namespace CGAL {
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// Default is a tag that can be used to shrink mangled names and
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// error messages in place of the default value of template arguments.
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// It could also be used by users to specify default values to arguments which
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// are not at the end of the argument list.
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// It can also be useful to easily break cyclic dependencies in templates.
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struct Default
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{
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template <typename Argument, typename Value>
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struct Get {
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typedef Argument type;
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};
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template <typename Value>
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struct Get <Default, Value> {
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typedef Value type;
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};
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template <typename Argument, typename Fct>
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struct Lazy_get {
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typedef Argument type;
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};
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template <typename Fct>
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struct Lazy_get <Default, Fct> {
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typedef typename Fct::type type;
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};
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};
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}
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#endif // CGAL_DEFAULT_H
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