[eigen] Strange behaviour with part<> in eigen2

[Sameer Agarwal <sameeragarwal@xxxxxxxxxx>]

Consider the following two programs

#include "Eigen/Core"

#include "Eigen/LU"

void Bar() {

  typedef Eigen::Matrix<double, 3,3, Eigen::RowMajor> MType;

  MType A  = MType::Identity();

  MType B;

  A.part<Eigen::SelfAdjoint>().computeInverse(&B);

}

int main(int argc, char** argv) {

  Bar();

  return 0;

}

and this compiles. No problem.  Now consider

#include "Eigen/Core"

#include "Eigen/LU"

template <int block_size>

void Bar() {

 typedef Eigen::Matrix<double, block_size, block_size, Eigen::RowMajor> MType;

  MType A  = MType::Identity();

  MType B;

  A.part<Eigen::SelfAdjoint>().computeInverse(&B);

}

int main(int argc, char** argv) {

  Bar<3>();

  return 0;

}

with gcc 4.4.3 we get the errors

test_eigen.cc: In function ‘void Bar()’:

test_eigen.cc:11: error: expected primary-_expression_ before ‘)’ token

test_eigen.cc: In function ‘void Bar() [with int block_size = 3]’:

test_eigen.cc:15:   instantiated from here

test_eigen.cc:11: error: invalid operands of types ‘<unresolved overloaded function type>’ and ‘const unsigned int’ to binary ‘operator<’

Any ideas what is going on here?

Sameer