Dear all,

Toolchain: VS++ 2010, Eigen 3.2.0 beta

Trying to compile very simple program fails:

Code: Select all

#include <Core>
#include <array> // Eigen's Array gets included instead of standard one!

int main(int argc, char* argv[])
{
   Eigen::MatrixXd C;
   std::array<int, 3> a1;
   return 0;
}

with the following output:

Error 2 error C2065: 'array' : undeclared identifier main.cpp 7
Error 3 error C2062: type 'int' unexpected main.cpp 7
Error 1 error C2039: 'array' : is not a member of 'std' main.cpp 7

The problem comes from the fact that Windows does not distinguish between upper and lower cases in file names. Therefore, Eigen's include "Array" gets included instead of a standard one.

Any idea how to overcome this problem?

Regards,
Alex

Ok, solved

Since Eigen's <Array> is deprecated dummy header, simply removing it solved the problem.

also, the standard and recommended way to include Eigen's header is to explicitly add the Eigen/ parent folder:

#include <Eigen/Core>

and so do not add path/to/eigen/Eigen in your include directories but only path/to/eigen.