Re: [eigen] Discrepancy between 3.1.4 and 3.2.0 behavior on a snippet

[Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>]

On 06.09.2013 06:31, Rhys Ulerich wrote:
>      typedef Array<double, Dynamic, Dynamic, ColMajor> array_type;
>      array_type A = array_type::Random(3, 5);
>      const VectorXd& b(A.row(2));

I guess that's the same issue as Bug 654
http://eigen.tuxfamily.org/bz/show_bug.cgi?id=654
Beware however, that (even in 3.1.4) you store a reference to a 
temporary, which will compile but can lead to undefined behavior (check 
with valgrind for invalid memory access).

Maybe you want something like this (untested):
    Ref<const VectorXd,0,Stride<> > b=A.row(2);


Christoph



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Dipl.-Inf., Dipl.-Math. Christoph Hertzberg
Cartesium 0.049
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