delegate.h

Go to the documentation of this file.

/*********************************************************************************
** Copyright (c) 2014 MAK Technologies, Inc.
** All rights reserved.
*********************************************************************************/

#pragma once


class DtMessage;

template <typename Ret, typename Param0>
class Callback
{
   public:
      virtual Ret invoke(Param0 param0) = 0;
};


template <typename Ret, typename Param0>
class StaticFunctionCallback : public Callback<Ret, Param0>
{
private:
   Ret (*func_)(Param0);

public:
   StaticFunctionCallback(Ret (*func)(Param0))
      : func_(func)
   {}

   virtual Ret invoke(Param0 param0)
   {
      return (*func_)(param0);
   }
};


template <typename Ret, typename Param0, typename T, typename Method>
class MethodCallback : public Callback<Ret, Param0>
{
private:
   void *object_;
   Method method_;

public:
   MethodCallback(void *object, Method method)
      : object_(object)
      , method_(method)
   {}

   virtual Ret invoke(Param0 param0)
   {
      T *obj = static_cast<T *>(object_);
      return (obj->*method_)(param0);
   }
};

template <typename Ret, typename Param0>
class DtDelegate
{
private:
   Callback<Ret, Param0> *callback_;

public:
   DtDelegate(Ret (*func)(Param0))
      :callback_(new StaticFunctionCallback<Ret, Param0>(func))
   {}

   template <typename T, typename Method>
   DtDelegate(T *object, Method method)
      :callback_(new MethodCallback<Ret, Param0, T, Method>(object, method))
   {}

   ~DtDelegate(void) { delete callback_; }

   Ret operator()(Param0 param0)
   {
      return callback_->invoke(param0);
   }
};

typedef DtDelegate<void, DtMessage*> DtMessageDelegate;