sentry.h

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#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