sentry.h

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/* Copyright (c) 2020, 2023, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   documentation.  The authors of MySQL hereby grant you an additional
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   This program is distributed in the hope that it will be useful,
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef CONTAINER_SENTRY_INCLUDED
#define CONTAINER_SENTRY_INCLUDED
 
#include <functional>
 
namespace raii {
/**
  Generic sentry class that invokes some callable object of type F upon disposal
  of an instance of this class.
 
  Check C++ documentation for the definition of `Callable` named requirement for
  more information.
 */
template <typename F = std::function<void()>>
class Sentry {
 public:
  /**
    Constructor for the class that stores the callable object passed as
    argument, to be invoked upon disposal of the object.
 
    @param dispose The callable object to be invoked upon disposal of the
                   object.
   */
  Sentry(F dispose);
  /**
    Destructor for the class. It will call the stored callable.
   */
  virtual ~Sentry();
 
 private:
  /** The callable to be invoked upon disposal of the object. */
  F m_dispose;
};
}  // namespace raii
 
template <typename F>
raii::Sentry<F>::Sentry(F dispose) : m_dispose{dispose} {}
 
template <typename F>
raii::Sentry<F>::~Sentry() {
  this->m_dispose();
}
 
#endif  // CONTAINER_SENTRY_INCLUDED