HandleToPointer.h

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// -*- C++ -*-

#if !defined(__ads_functor_HandleToPointer_h__)
#define __ads_functor_HandleToPointer_h__

#include "../defs.h"

#include <iterator>
#include <functional>

BEGIN_NAMESPACE_ADS

//-----------------------------------------------------------------------------
// @{


template < typename Handle, 
           typename Pointer = typename 
           std::iterator_traits<Handle>::pointer >
struct HandleToPointer : 
  public std::unary_function<Handle,Pointer> 
{
  typedef std::unary_function<Handle,Pointer> base_type;
  typedef typename base_type::argument_type argument_type;
  typedef typename base_type::result_type result_type;
  
  result_type
  operator()( argument_type x ) const 
  { 
    return &*x; 
  }
};


template < typename Handle>
inline
HandleToPointer<Handle>
handle_to_pointer()
{
  return HandleToPointer<Handle>();
}

// @}

END_NAMESPACE_ADS

#endif

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