Re: [boost] [assign] ptr_list_of legal?

From: shunsuke (pstade.mb_at_[hidden])
Date: 2007-05-30 11:59:38

Thorsten Ottosen wrote:
> shunsuke skrev:
>> Hi,
>>
>> I found a snippet from <boost/assign/ptr_list_of.hpp>:
>>
>>     template< class T >
>>     class generic_ptr_list
>>     {
>>         // ...
>>     public:
>>         template< class PtrContainer >
>>         operator std::auto_ptr<PtrContainer>() const
>>         { .. }
>>     };
>>
>> IIRC, this automatic conversion doesn't work on any conforming compiler.
> 
> Why?

The rule seems complicated. :-(
This is because it requires two user-defined conversions?
   generic_ptr_list -> operator auto_ptr() -> operator auto_ptr_ref() -> auto_ptr

In the case of lvalue:
   generic_ptr_list -> operator auto_ptr&() -> auto_ptr

I hope a lawyer will look into this posting. :-)

Regards,

-- 
Shunsuke Sogame