Re: [eigen] Eigen with Boost::smart_ptr

[Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>]

Hi,

On 08.11.2011 13:07, Sathishkumar Duraisamy wrote:
> Hi all,
>
> I am in some kind of signal processing application. To manage and
> manipulate data, I have been using Eigen Matrix.
>
> Can you please give me some recommendation for using pointers for
> dynamically allocated eigen matrix?

I guess you need to be a bit more specific for that ...
Maybe you don't need to dynamically allocate your matrices at all, since 
Eigen::MatrixXd already dynamically allocate their memory.

Side note: That might actually be a nice feature, having kind-of a 
shared matrix, i.e. multiple instances of the same matrix share the same 
memory until the matrix is modified, in which case it allocates new 
memory (unless of course it is the last instance using that memory).

> Is it possible to use  boost::smart_ptr and boost::pointer_container
> with Eigen Matrix. In case, which is good smart_ptr, shared_ptr or
> week ptr?

I can't see a reason why it is not possible.

smart_ptr is just the name of the library, isn't it?
W.r.t shared_ptr vs weak_ptr: you can construct weak_ptr only from 
shared_ptr, so you need at least one shared_ptr per matrix anyways. 
What's better afterwards depends on what you are planning to do.

Christoph



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Dipl.-Inf. Christoph Hertzberg
Cartesium 0.051
Universität Bremen
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