Re: Problem understanding 'boost::intrusive::list_member_hook<>'

From: Joaquín M López Muñoz (joaquinlopezmunoz_at_[hidden])
Date: 2021-09-11 12:10:45

> Em 11 de set de 2021, Ã (s) 13:51, John Emmas via Boost-users <boost-users_at_[hidden]> escreveu:
> On 11/09/2021 12:11, Joaquin M López Muñoz via Boost-users wrote:
>> 
>> So, you have two options:
>> 
>> * Make sure that elements are removed from lists before being destroyed
>> * Activate auto-unlink mode for your lists
> 
> Thanks Jaoquin - after reading that article it looked like I'd need to change all occurrences of:-
> 
>    public boost::intrusive::list_base_hook<>
> 
> to be this:-
> 
>    public boost::intrusive::list_base_hook< boost::intrusive::link_mode<boost::intrusive::auto_unlink> >
> 
> but after doing that, all compiles now trigger a new assert in 'boost/intrusive/list.hpp':-
> 
>   //Constant-time size is incompatible with auto-unlink hooks!
>   BOOST_STATIC_ASSERT(!(constant_time_size &&
>                        ((int)value_traits::link_mode == (int)auto_unlink)
>                      ));
The comment above the assert says it all. Take a look at how  constant_time_size<false> is used in the docs for auto-unlink hooks. 

Joaquín M López Muñoz