Re: [eigen] Special topic page on Aliasing

[Jitse Niesen <jitse@xxxxxxxxxxxxxxxxx>]

On Wed, 4 Aug 2010, Benoit Jacob wrote:

> > > I have a few comments about the content. The example a=a.transpose()
> > > is a bit special as we do catch it with an assertion in Eigen. So it's
> > > not really dangerous (not any more than any other illegal op) it's
> > > just illegal.
>
> Wait... indeed this example is already mentioned on page 2 of the
> tutorial and the output does show the aliasing problem. What's
> happening?? I thought we were catching this?? See
> checkTransposeAliasing_impl in Transpose.h ... ?!

After a bit of a search, I found out that this example is compiled with 
EIGEN_NO_DEBUG (see the last line in doc/snippets/CMakeLists.txt) and thus 
the assertion is not checked. I'll add something to the aliasing 
docs page to clarify this.


Jitse