g++ 4.7.1 warning (enumeral and non-enumeral type in conditional expression)

Submitted by Benjamin Piwowarski

Assigned to Nobody

Link to original bugzilla bug (#509)
Version: 3.1

Description

Created attachment 294
Sample C++ code producing the warning

Compiling the attachment with -Wextra results in a warning with g++ 4.7.1 (with g++ 4.2.1 there is no warning)

$ g++-4.7 -Wextra -o a a.cc

In file included from Eigen/Core:246:0,
from Eigen/SparseCore:4,
from Eigen/Sparse:17,
from a.cc:3:
Eigen/src/Core/util/XprHelper.h: In instantiation of 'struct Eigen::internal::nested<Eigen::SparseSparseProduct<const Eigen::SparseMatrix<double>&, const Eigen::SparseMatrix<double>&>, 1, Eigen::SparseMatrix<double, 6, int> >':
Eigen/src/SparseCore/SparseProduct.h:85:5: required from 'class Eigen::SparseSparseProduct<const Eigen::SparseMatrix<double>&, const Eigen::SparseMatrix<double>&>'
a.cc:11:32: required from here
Eigen/src/Core/util/XprHelper.h:296:8: warning: enumeral and non-enumeral type in conditional expression [enabled by default]

Attachment 294, "Sample C++ code producing the warning":
a.cc