CCallbackWrapper.h

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// -*- c++ -*-
//*****************************************************************************
//*****************************************************************************

#ifndef polybori_ring_CCallback_Wrapper_h_
#define polybori_ring_CCallback_Wrapper_h_

// include basic definitions
#include <polybori/pbori_defs.h>
#include "CMemberFunctionTraits.h"

BEGIN_NAMESPACE_PBORI


template <class Type, class ResultType, class ArgType>
class CCallbackFacade {
public:
 
  ResultType operator()(ArgType arg) const {
    return (static_cast<const Type&>(*this).object .* 
            static_cast<const Type&>(*this).function)(arg);
  }
};

template <class Type, class ArgType>
class CCallbackFacade<Type, void, ArgType> {
public:
 
  void operator()(ArgType arg) const {
    (static_cast<const Type&>(*this).object .* 
     static_cast<const Type&>(*this).function)(arg);
  }
};

template <class MemberFuncPtr>
class CCallbackWrapper:
  public CCallbackFacade< CCallbackWrapper<MemberFuncPtr>, 
              typename CMemberFunctionTraits<MemberFuncPtr>::result_type,
              typename CMemberFunctionTraits<MemberFuncPtr>::argument_type> {
  typedef CCallbackWrapper self;

public:
  typedef CMemberFunctionTraits<MemberFuncPtr> traits;

  friend class CCallbackFacade<self, typename traits::result_type,
                               typename traits::argument_type>;
  typedef typename traits::object_reference reference;

  CCallbackWrapper(reference value, MemberFuncPtr ptr):
    object(value), function(ptr) { }

private:
  reference object;
  MemberFuncPtr function;
};

END_NAMESPACE_PBORI

#endif

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