Re: [Boost-users] Please help me to choose a container

Subject: Re: [Boost-users] Please help me to choose a container
From: Jayden Shui (jayden.shui_at_[hidden])
Date: 2011-12-20 18:53:36

On Tue, Dec 20, 2011 at 6:40 PM, Krzysztof Czainski <1czajnik_at_[hidden]>wrote:

> 2011/12/20 Jayden Shui <jayden.shui_at_[hidden]>
>
>> Hi All,
>
> Hi Jayden,
>
>>
>> I have a number of named objects of type B whose name can be accessed by
>> B::Name(). B is polymorphic. D1, D2 and so on are derived from B. I want to
>> put them in a set or map-like container ordered by their names. They are
>> referenced by other objects, such as of type C. If the objects in the
>> container are changed by its type (from type D1 to D2)
>>
>
> How can an object change it's type? Don't you need to erase an object and
> create a new one to achieve that?
>

Yes it is.

>  or value, their users can know it automatically, i.e. those information
>> is shared among owners and users. To erase an object in the container,
>> first we need to ensure it is not be used by other objects.
>>
>> Please help me on choose a proper container with smart pointers. I am
>> struggling with it by trying multi-index-container, pointer container,
>> standard container, and cannot find a good way.
>>
>
> My first guess would be write your own container adaptor, that uses
> std::set/map< shared_ptr<B>, your_compare >...
>

Do I need  std::set/map< shared_ptr<scoped_ptr<B>>, your_compare > to do
it, since it is the B* shared? Thanks a lot.

> Regards
> Kris
>
>