Re: [eigen] operator== (and probably others) for 0-sized Eigen-types

[Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>]

On 11.11.2013 23:59, Gael Guennebaud wrote:
> I cannot reproduce the compilation issue with both gcc and clang. Here is
> what I tested:
>
> #include <Eigen/Core>
> #include <iostream>
> int main() {
>    Eigen::Matrix<double, 1, 0> A, B;
>    std::cout << (A == B) << "\n";
> };

The problem arises if the number of RowsAtCompileTime is zero:

> > /Users/maven/Development/dlr/dx/negev/thirdparty/eigen-3.2.0/Eigen/src/Core/BooleanRedux.h:21:11:
> > error: expression is not an integral constant expression
> >      col = (UnrollCount-1) / Derived::RowsAtCompileTime,
> >            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The fix won't be too complicated, I just did not care enough yet ...
If there are no objections against [].all()==true && [].any()==false, I 
can implement that this week (unless someone is faster).

Christoph


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