ptr_wrapper.h

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#ifndef _BBM_PTR_WRAPPER_CONCEPT_H_
#define _BBM_PTR_WRAPPER_CONCEPT_H_
 
/************************************************************************/
/*! \file ptr_wrapper.h
  \brief A shared_ptr wrapper.
*************************************************************************/
 
namespace bbm {
  namespace concepts {
 
    /********************************************************************/
    /*! \brief ptr_wrapper concept
 
      \tparam T = pointer wrapper class
      \tparam BASE = type of underlying wrapper object.
      
      A ptr wrapper has the following:
      + the arrow operator
      + const std::shared_ptr<BASE>& ptr(void) const
    *********************************************************************/
    template<typename T, typename BASE>
      concept ptr_wrapper = requires(const T& t)
    {
      { t.ptr() } -> std::convertible_to< std::shared_ptr<BASE> >;
      requires concepts::has_arrow<T>;
    };
  
  } // end concepts namespace
} // end bbm namespace
 
#endif /* _BBM_PTR_WRAPPER_CONCEPT_H_ */