52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
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// Copyright (c) 2014 GeometryFactory Sarl (France)
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// 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) : Jane Tournois
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#ifndef CGAL_HAS_TIMESTAMP_H
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#define CGAL_HAS_TIMESTAMP_H
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#include <boost/mpl/has_xxx.hpp>
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#include <CGAL/tags.h>
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namespace CGAL {
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namespace internal {
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BOOST_MPL_HAS_XXX_TRAIT_DEF(Has_timestamp)
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// Used by Compact container to make the comparison of iterator
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// depending on the insertion order rather than the object address
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// when the object class defines a Has_timestamp tag
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// This is for example used in to make Mesh_3 deterministic, see
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// classes implementing concepts MeshCellBase_3 and MeshVertexBase_3
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template <typename T, bool has_ts = has_Has_timestamp<T>::value>
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struct Has_timestamp : public T::Has_timestamp
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// when T has a Has_timestamp tag
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{};
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template <typename T>
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struct Has_timestamp<T, false> : public Tag_false
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// when T does not have a Has_timestamp tag
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{};
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} // end namespace internal
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} // end namespace CGAL
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#endif // CGAL_HAS_TIMESTAMP_H
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