[Rock-dev] Uninitialized values for base/types

[Leif Christensen]

Hi,

just yesterday I was manually setting parts of my samples/IMUSensors
manually to unknown using the stuff defined in base/types/base/Float.hpp

According to our documentation here:

http://rock.opendfki.de/wiki/WikiStart/Standards/RG3

we have in addition to "unknown" also "unset" with a slightly different
meaning.

LG,
Leif

Am 10.11.2014 um 14:00 schrieb Jakob Schwendner:
> Hey,
> 
> I would like to reopen a discussion for uninitialized values in base/types.
> This was triggered by the following merge request:
> https://github.com/rock-core/base-types/pull/17
> 
> The question boils down to how we want to handle default constructors in
> base types.
> Options:
> a) Leave uninitialized (like e.g. Eigen does)
> b) Initialize to zero or whatever equivalent
> c) Initialize to unknown (represented as NaN)
> 
> I think we currently have a) in some places and c) in others.
> 
> My contribution to the discussion:
> b) seems even more dangerous than a, as it wouldn't even be picked up by
> valgrind. No good.
> a) May be slightly more efficient in some special cases
> c) seems like the right thing to do.
> 
> RigidBodyState tries a mix between a) and c). Maybe this could be the way
> forward?
> 
> Cheers,
> 
> Jakob
> 

-- 
 Leif Christensen

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