Re: [boost] Change arbitrary collection element type?

From: Matias Capeletto (matias.capeletto_at_[hidden])
Date: 2007-07-11 10:18:45

On 7/11/07, Cédric Venet <cedric.venet_at_[hidden]> wrote:
> Quoting Ulrich Eckhardt <doomster_at_[hidden]>:
>
> > On Wednesday 11 July 2007 05:55:59 Marat Khalili wrote:
> >> Are there any standard means to clone collection class while changing
> >> only element type? Like receiving some_collection<int> as a template
> >> parameter and creating some_collection<string> without knowing what
> >> exactly some_collection is.
> >
> > Looks like a case for std::transform(), or?
>
> I think he wants to transform only the type (at compile time). A
> facility like rebind for the stl allocator.
>
> Somthing like this but specialised for all the stl container:
>
> template<class T,class D> struct rebind;
> template<class T,class D> struct rebind< std::vector<T>, D > {
>     typedef std::vector<D> type;
> };
> ...
> typedef rebind< some_collection<int>, string > some_collection_string;
>
> I don't know an existing implementation, and I don't have immediat use
> of this, but it could be useful.

You can take a look at Boost.ContainerAdaptor, an internal library of
Boost.Bimap. There are no docs yet... I will write them soon.

Best regards
Matias