text: /*
   * Copyright (c) 2011-2021, The DART development contributors
   * All rights reserved.
   *
   * The list of contributors can be found at:
   *   https://github.com/dartsim/dart/blob/main/LICENSE
   *
   * This file is provided under the following "BSD-style" License:
   *   Redistribution and use in source and binary forms, with or
   *   without modification, are permitted provided that the following
   *   conditions are met:
   *   * Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   *   * Redistributions in binary form must reproduce the above
   *     copyright notice, this list of conditions and the following
   *     disclaimer in the documentation and/or other materials provided
   *     with the distribution.
   *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
   *   CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
   *   INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   *   MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   *   DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
   *   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   *   USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   *   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   *   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   *   ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   *   POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef DART_COMMON_VERSIONCOUNTER_HPP_
  #define DART_COMMON_VERSIONCOUNTER_HPP_
  
  #include <cstddef>
  
  namespace dart {
  namespace common {
  
  /// VersionCounter is an interface for objects that count their versions
  class VersionCounter
  {
  public:
    /// Default constructor
    VersionCounter();
  
    /// Increment the version for this object
    virtual std::size_t incrementVersion();
  
    /// Get the version number of this object
    virtual std::size_t getVersion() const;
  
    virtual ~VersionCounter() = default;
  
  protected:
    void setVersionDependentObject(VersionCounter* dependent);
  
    std::size_t mVersion;
  
  private:
    VersionCounter* mDependent;
  };
  
  } // namespace common
  } // namespace dart
  
  #endif // DART_COMMON_VERSIONCOUNTER_HPP_
  