[eigen] [sparse] bool isMuchSmallerThan<OtherScalar>

[<bernard.hugueney@xxxxxxxxxx>]

On Thu, 25 Nov 2010 15:50:43 +0100, <bernard.hugueney@xxxxxxxxxx> 
wrote:
> Hi Gael,
> Thanks for your answer.

> Btw, à propos Eigen::Sparse<bool> :

> - template<> struct scalar_fuzzy_impl<bool> seemed to be missing an
> isMuchSmallerThan() for some sparse operation but I fail
> to be able to reproduce the error (I rewrote the code that was
> triggering it :( )

I hit it again. It happens when calling sparseview() from a dense 
boolean matrix :

#include <Eigen/Sparse>

int main(int argc, char* argv[])
{
    Eigen::Matrix<bool, Eigen::Dynamic, Eigen::Dynamic> db(2,2);
    Eigen::SparseMatrix<bool> a(db.sparseView());
    return 0;
}
fails with

In file included from 
/home/hugueney/Code/HPC/MatrixLibs/Eigen/eigen/Eigen/Core:238:0,
                 from 
/home/hugueney/Code/HPC/MatrixLibs/Eigen/eigen/Eigen/Sparse:4,
                 from tst-bool.cxx:1:
Eigen/src/Core/MathFunctions.h: In function ‘bool 
Eigen::internal::isMuchSmallerThan(const Scalar&, const OtherScalar&, 
typename Eigen::NumTraits<Scalar>::Real) [with Scalar = bool, 
OtherScalar = bool, typename Eigen::NumTraits<Scalar>::Real = bool]’:
/home/hugueney/Code/HPC/MatrixLibs/Eigen/eigen/Eigen/src/Sparse/SparseView.h:95:5: 
  instantiated from ‘void 
Eigen::SparseView<MatrixType>::InnerIterator::incrementToNonZero() [with 
MatrixType = Eigen::Matrix<bool, -0x00000000000000001, 
-0x00000000000000001>]’
Eigen/eigen/Eigen/src/Sparse/SparseView.h:77:5:   instantiated from 
‘Eigen::SparseView<MatrixType>::InnerIterator::InnerIterator(const 
Eigen::SparseView<MatrixType>&, Eigen::SparseView<MatrixType>::Index) 
[with MatrixType = Eigen::Matrix<bool, -0x00000000000000001, 
-0x00000000000000001>, Eigen::SparseView<MatrixType> = 
Eigen::SparseView<Eigen::Matrix<bool, -0x00000000000000001, 
-0x00000000000000001> >, Eigen::SparseView<MatrixType>::Index = int]’
Eigen/eigen/Eigen/src/Sparse/SparseMatrix.h:483:66:   instantiated from 
‘Eigen::SparseMatrix<_Scalar, _Flags, _Index>& 
Eigen::SparseMatrix<_Scalar, _Flags, _Index>::operator=(const 
Eigen::SparseMatrixBase<OtherDerived>&) [with OtherDerived = 
Eigen::SparseView<Eigen::Matrix<bool, -0x00000000000000001, 
-0x00000000000000001> >, _Scalar = bool, int _Options = 0, _Index = int, 
Eigen::SparseMatrix<_Scalar, _Flags, _Index> = 
Eigen::SparseMatrix<bool>]’
Eigen/eigen/Eigen/src/Sparse/SparseMatrix.h:414:7:   instantiated from 
‘Eigen::SparseMatrix<_Scalar, _Flags, _Index>::SparseMatrix(const 
Eigen::SparseMatrixBase<OtherDerived>&) [with OtherDerived = 
Eigen::SparseView<Eigen::Matrix<bool, -0x00000000000000001, 
-0x00000000000000001> >, _Scalar = bool, int _Options = 0, _Index = 
int]’
tst-bool.cxx:6:48:   instantiated from here
Eigen/eigen/Eigen/src/Core/MathFunctions.h:834:92: error: 
‘isMuchSmallerThan<OtherScalar>’ is not a member of 
‘Eigen::internal::scalar_fuzzy_impl<bool>’

Compilation exited abnormally with code 1 at Thu Nov 25 15:55:44

Best Regards,

Bernard