id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
288,adapters for smart_ptr?,nobody,Peter Dimov,"{{{
Hello, 
May be I just can't find this, but... 
 
I would like to use the STL algorithms on STL 
containers of smart_ptrs.  So I need an adapter that 
adapts a member function of a class that is pointed 
to by a smart_ptr.  The standard boost::mem_fun does 
not do this. 
 
So, I wrote this class: 
 
template <template<class> class PTR, typename S, 
typename T> 
class mem_fun_ptr_t : public std::unary_function<T*, 
S> 
    { 
      public: 
        explicit mem_fun_ptr_t(S (T::*p)()) 
            : 
            ptr(p) 
        {} 
        S operator()(PTR<T> p) const 
        { 
            return ((*p).*ptr)(); 
        } 
      private: 
        S (T::*ptr)(); 
    }; 
 
    template <template<class> class PTR, typename S, 
typename T> 
    inline mem_fun_ptr_t<PTR,S,T> mem_fun_ptr(S 
(T::*f)()) 
    { 
        return mem_fun_ptr_t<PTR,S,T>(f); 
    } 
//============================ 
// 
// usage (e.g.): 
// ============= 
// class MyClass { 
// public: 
//   void method() { /* Do something */ } 
// }; 
// //... 
// std::vector<shared_ptr<MyClass> > myVector; 
// //...  (fill myVector) 
// 
// std::for_each(myVector.begin(),myVector.end(), 
// simon::mem_fun_ptr<shared_ptr>(&MyClass::method)); 
// 
 
May be I am re-inventing the wheel? 
(If so please tell me :^) 
 
If not, could something like this be added to boost? 
 
Thanks, 
 
Simon Robbins. 
robbins@physik.uni-wuppertal.de 
}}}",Feature Requests,closed,,smart_ptr,None,,None,,