get_by_id.hpp

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#ifndef GET_BY_ID_HPP_
#define GET_BY_ID_HPP_
#include "boost/type_traits/remove_reference.hpp"
#include "boost/type_traits/remove_const.hpp"

namespace vdj_pipe{ namespace detail{

template<
   class Stor,
   class Id,
   class Obj,
   typename Result,
   Result(Obj::*MemFunPtr)()const
>
class Getter {
public:
   typedef typename boost::remove_const<
               typename boost::remove_reference<Result>::type
            >::type result_type;

   explicit Getter(Stor const& stor) : stor_(stor) {}
   Result operator()(const Id id) const {return (stor_[id].*MemFunPtr)();}
private:
   Stor const& stor_;
};

}//namespace detail
}//namespace vdj_pipe
#endif /* GET_BY_ID_HPP_ */