43 lines
1.3 KiB
C
43 lines
1.3 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)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/STL_Extension/include/CGAL/Has_timestamp.h $
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// $Id: Has_timestamp.h 52164b1 2019-10-19T15:34:59+02:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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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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