Re: [eigen] Memory leaks

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Am 15.04.2015 um 09:32 schrieb Gael Guennebaud:
On Tue, Apr 14, 2015 at 5:09 PM, Christoph Hertzberg <
chtz@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
here Base is called with rows and cols of `other`, even though `other`
needs to be transposed. Base then does not assert that cols==1.

yes, we could add internal assertions for that, and also to check that size
== rows*cols in DenseStorage.

Yes, we should (after fixing this issue).

Is there a reason to call Base(size, rows, cols) at all? The call to
should do all appropriate resizing, does it not?

I've removed that line and my test-case passes now. I'm running the
test-suite now to see if this has any unforeseen side-effects.

yes, this seems to be the simplest solution.

While the test-suite ran without (new) failures, I found a possible reason for calling the Base constructor. When compiling with
the Base::_set_noalias(other) call would assert (which it should not for the constructor). Adding a call to resizeLike(other) -- not _resize_to_match -- should do the job.

Two other things:
The ReturnByValue constructor does not implicitly transpose the result if required, is this intended? Implementing this would require a few lines of additional code in the assignment logic.

The constructors of Array and Matrix are almost identical, except that Array has an ArrayBase and Matrix has a MatrixBase constructor. Both have an EigenBase constructor (which, however, calls operator= instead of _set_noalias). Couldn't we delegate all constructors to PlainObjectBase, and implementing for Array and Matrix only two constructors each:

  Array(const Array& other) : Base(other.derived()) {}
  Array(const EigenBase<OtherDerived>& other) : Base(other.derived()) {}

Or is there a reason that, e.g., Matrix(const ArrayBase<..>&) shall be handled differently than Array(const ArrayBase<..>&) ? In PlainObjectBase both could be handled by a DenseBase<..>& constructor (calling _set_noalias(other), instead of operator=).


Dipl.-Inf., Dipl.-Math. Christoph Hertzberg
Cartesium 0.049
Universität Bremen
Enrique-Schmidt-Straße 5
28359 Bremen

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