mirror of https://github.com/CGAL/cgal
46 lines
880 B
C++
46 lines
880 B
C++
// Copyright (c) 2016 GeometryFactory (France). 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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// $URL$
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// $Id$
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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_MEMBER_ID_H
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#define CGAL_HAS_MEMBER_ID_H
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namespace CGAL {
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namespace internal {
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template <typename Type>
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class Has_member_id
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{
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typedef char yes[1];
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typedef char no[2];
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struct BaseWithId
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{
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void id(){}
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};
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struct Base : public Type, public BaseWithId {};
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template <typename T, T t>
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class Helper{};
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template <typename U>
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static no &check(U*, Helper<void (BaseWithId::*)(), &U::id>* = 0);
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static yes &check(...);
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public:
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static const bool value = (sizeof(yes) == sizeof(check((Base*)(0))));
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};
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} // internal
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} // cgal
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#endif /* CGAL_HAS_MEMBER_ID_H */
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