mirror of https://github.com/CGAL/cgal
108 lines
2.8 KiB
C++
108 lines
2.8 KiB
C++
// Copyright (c) 2012 INRIA Sophia-Antipolis (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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//
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// Author(s) : Clement Jamin
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#ifndef CGAL_COMPACT_CONTAINER_STRATEGIES_H
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#define CGAL_COMPACT_CONTAINER_STRATEGIES_H
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#include <CGAL/tags.h>
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namespace CGAL {
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// A basic "do nothing" strategy
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// One can inheritate from it for partial specialisation
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class Compact_container_strategy_base {
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public:
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typedef Tag_false Uses_erase_counter;
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// Do nothing
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template <typename Element>
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static unsigned int get_erase_counter(const Element &) { return 0; }
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template <typename Element>
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static void set_erase_counter(Element &, unsigned int) {}
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template <typename Element>
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static void increment_erase_counter(Element &) {}
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};
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// A strategy managing an internal counter
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class Compact_container_strategy_with_counter
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{
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public:
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typedef Tag_true Uses_erase_counter;
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template <typename Element>
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static unsigned int get_erase_counter(const Element &e)
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{
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return e.get_erase_counter();
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}
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template <typename Element>
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static void set_erase_counter(Element &e, unsigned int c)
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{
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e.set_erase_counter(c);
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}
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template <typename Element>
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static void increment_erase_counter(Element &e)
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{
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e.increment_erase_counter();
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}
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};
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// CC_safe_handle is a helper that store a CC handle and its erase
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// counter value (value when the CC_safe_handle instance was created).
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// The is_zombie() function allows to know if the pointee was erased since.
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template <typename CC_iterator>
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class CC_safe_handle
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{
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typedef typename CC_iterator::Strategy Strategy;
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public:
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CC_safe_handle(CC_iterator handle)
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: m_handle(handle)
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, m_erase_counter_value(Strategy::get_erase_counter(*handle))
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{
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CGAL_static_assertion(
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(boost::is_same<Strategy::Uses_erase_counter, Tag_true>::value));
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}
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bool is_zombie() const
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{
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return Strategy::get_erase_counter(*m_handle) != m_erase_counter_value;
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}
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CC_iterator get_cc_iterator() const
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{
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return m_handle;
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}
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protected:
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CC_iterator m_handle;
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unsigned int m_erase_counter_value;
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};
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template <typename CC_iterator>
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CC_safe_handle<CC_iterator> make_cc_safe_handle(CC_iterator handle)
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{
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return CC_safe_handle<CC_iterator>(handle);
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}
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} //namespace CGAL
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#endif // CGAL_COMPACT_CONTAINER_STRATEGIES_H
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