Maciej Sobczak wrote:

Hi,

There is a thread on comp.lang.c++.moderated where the problem of manipulating with "heavy" data in STL containers was raised. The name of the thread is "Messign with expensive objects in containers".

I have posted a solution with the help of a simple view adaptor class that I wrote a while ago. The code with examples and documentation is here:

http://www.msobczak.com/prog/bin/view.zip (11kB)

Alberto Barbati suggested to post it here for review. It is different from boost::multi_index in that view operates on already existing objects or sequences.

Note: the view class itself is very simple and as a concept is only a fraction of what is available in the View Template Library:

http://www.zib.de/weiser/vtl/

I would like to know your opinion about the view as a concept, and its simple implementation that I referenced above. It might fit into the Containers category of Boost libraries.

Note having looked at your view adaptor class (view.zip), but quickly glancing over the VTL (of which I was unaware), I realize that I've developed similar concepts here at work for, atop of what can be done with Blitz++ (from Todd Veldhuzien). I'd certainly be all for such a library as part of Boost - but geez, the thought put into the VTL is both admirable, and induces one to salivate (much as Homer Simpson might do over donuts) ;-) Cheers, -- Manfred Doudar MetOcean Engineers 03 May, 2005