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// Copyright (c) 2014 GeometryFactory Sarl (France)
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/STL_Extension/include/CGAL/Has_timestamp.h $
// $Id: include/CGAL/Has_timestamp.h 08b27d3db14 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Jane Tournois
#ifndef CGAL_HAS_TIMESTAMP_H
#define CGAL_HAS_TIMESTAMP_H
#include <boost/mpl/has_xxx.hpp>
#include <CGAL/tags.h>
namespace CGAL {
namespace internal {
BOOST_MPL_HAS_XXX_TRAIT_DEF(Has_timestamp)
// Used by Compact container to make the comparison of iterator
// depending on the insertion order rather than the object address
// when the object class defines a Has_timestamp tag
// This is for example used in to make Mesh_3 deterministic, see
// classes implementing concepts MeshCellBase_3 and MeshVertexBase_3
template <typename T, bool has_ts = has_Has_timestamp<T>::value>
struct Has_timestamp : public T::Has_timestamp
// when T has a Has_timestamp tag
{};
template <typename T>
struct Has_timestamp<T, false> : public Tag_false
// when T does not have a Has_timestamp tag
{};
template <typename T>
constexpr bool has_timestamp_v = Has_timestamp<T>::value;
} // end namespace internal
} // end namespace CGAL
#endif // CGAL_HAS_TIMESTAMP_H
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