[boost] Re: how do I release shared_ptr ?

From: David Abrahams (dave_at_[hidden])
Date: 2004-01-08 13:12:59

Angus Leeming <angus.leeming_at_[hidden]> writes:

> David Abrahams wrote:
>>> I have this code that use shared_ptr<>::use_count() to
>>> ascertain whether to remove an item from a cache:
>>>
>>> Is that the sort of thing you are interested in?
>> 
>> Yep, but unique is not quite the same as use_count.
>
> I guess that I wrote the code without noticing unique()s existence. 
> However, I now know of it (thanks ;-) and have checked the code in 
> boost/detail/shared_count.hpp:
>
>     bool unique() const // nothrow
>     {
>         return use_count() == 1;
>     }
>
> I find that this is exactly what I use myself, so will modify my code 
> to use shared_ptr<>::unique().

Will your code work just as well if unique changed to:

    bool unique() const // nothrow
    {
        return weak_count() == 1;
    }

??
-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com