Geometry Boost List: [geometry] Default model for Ring Concept should *be* Container, not inherit from it

Subject: [geometry] Default model for Ring Concept should *be* Container, not inherit from it
From: Volker Schöch (vschoech_at_[hidden])
Date: 2012-02-15 11:58:17

Hi again,

 

I wonder why you bothered to make boost::geometry::model::ring a type of its own, merely wrapping the Container type. It does not have any methods or members of its own. Some say that inheriting from an STL type is practically always a bad idea, and the same rationale applies here.

 

I am not being pedantic, here is my case in point. The current implementation requires some ugly syntantic hacking to achieve a very simple and natural thing:

http://codepad.org/qASAKH8R

 

(If you are puzzled by my passing a vector by value, you might want to read http://cpp-next.com/archive/2009/08/want-speed-pass-by-value/ by Dave Abrahams.)

 

Maybe that's something to consider for a future version. At the surface, it doesn't look like a change that has many implications on existing code. I assume this could be relatively easily fixed.

 

Regards,

   Volker

--
Volker Schöch | vschoech_at_[hidden]
Senior Software Engineer
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