Re: [boost] Question and idea for smart pointers

From: Ion Gaztañaga (ion_g_m_at_[hidden])
Date: 2005-01-07 05:30:34

>>template< class P, class V > struct pointer_to_other;
>>template< template<class> class P, class U, class V >
>>struct pointer_to_other< P<U>, V >
>>{
>>    typedef P<V> type;
>>};

>>#include <boost/shared_ptr.hpp>
>>#include <typeinfo>
>>#include <iostream>

>>int main()
>>{
>>    typedef pointer_to_other< boost::shared_ptr<int>, double >::type
>> pointer;
>>    std::cout << typeid(pointer).name() << std::endl;
>>}

>>On compilers that can't handle the above, just add partial specializations
>>for "well known" pointer types (auto_ptr, shared_ptr).

I think this would work only with template classes with only one template
parameter, like shared_ptr, but not with other smart pointers (offset_ptr or
others, or future smart pointers that have some extra policy template
parameters). I would propose
adding a similar general well-known (at least with boost smart pointers)
mechanism to obtain a pointer to other generically. Do you think this
pointer_to_other is general enough to include it in the same level as
get_pointer, or do you find this mechanism too particular?

Regards,

Ion