Callback.hpp

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/*--------------------------------------------------------------------*/
/*    Copyright 2002 Sandia Corporation.                              */
/*    Under the terms of Contract DE-AC04-94AL85000, there is a       */
/*    non-exclusive license for use of this work by or on behalf      */
/*    of the U.S. Government.  Export of this program may require     */
/*    a license from the United States Government.                    */
/*--------------------------------------------------------------------*/

// Callback class basics from Herb Sutter, http://www.gotw.ca, GOTW #83.

#ifndef STK_UTIL_UTIL_Callback_hpp
#define STK_UTIL_UTIL_Callback_hpp

namespace sierra {

template<class T>
class Callback;

template<>
class Callback<void>
{
public:
  virtual void operator()() const = 0;

  virtual ~Callback()
  {}
};

typedef Callback<void> CallbackBase;      

template<typename T>
class Callback : public Callback<void>
{
public:
  typedef void (T::*F)();       

  Callback(T &t, F f)
    : m_t(&t),
      m_f(f)
  {}

  virtual ~Callback()
  {}

  virtual void operator()() const {
    (m_t->*m_f)();
  }

private:
  T *   m_t;          
  F   m_f;          
};

template<typename T>
CallbackBase *
create_callback(
  T &   t,
  void    (T::*f)())
{
  return new Callback<T>(t, f);
}

} // namespace sierra

#endif // STK_UTIL_UTIL_Callback_hpp