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// Copyright (c) 2007,2009 INRIA Sophia-Antipolis (France). All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/STL_Extension/include/CGAL/Default.h $
// $Id: include/CGAL/Default.h b26b07a1242 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Sylvain Pion
#ifndef CGAL_DEFAULT_H
#define CGAL_DEFAULT_H
namespace CGAL {
// Default is a tag that can be used to shrink mangled names and
// error messages in place of the default value of template arguments.
// It could also be used by users to specify default values to arguments which
// are not at the end of the argument list.
// It can also be useful to easily break cyclic dependencies in templates.
struct Default
{
template <typename Argument, typename Value>
struct Get {
typedef Argument type;
};
template <typename Value>
struct Get <Default, Value> {
typedef Value type;
};
template <typename Argument, typename Fct>
struct Lazy_get {
typedef Argument type;
};
template <typename Fct>
struct Lazy_get <Default, Fct> {
typedef typename Fct::type type;
};
};
}
#endif // CGAL_DEFAULT_H
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