Make SubsetPreconditionerTest compatible with old Eigen.
The enum Eigen::UpLoType did not have a name in older versions
of Eigen, so a templated function using that enum type fails
to compile with earlier versions of Eigen.
This change replaces the enum in the template declaration with
an int.
Change-Id: Id128fd96b76818be347ee6ed5945c231936d9af8
diff --git a/internal/ceres/subset_preconditioner_test.cc b/internal/ceres/subset_preconditioner_test.cc
index 0f4cc6c..147ecf8 100644
--- a/internal/ceres/subset_preconditioner_test.cc
+++ b/internal/ceres/subset_preconditioner_test.cc
@@ -44,7 +44,7 @@
// TODO(sameeragarwal): Refactor the following two functions out of
// here and sparse_cholesky_test.cc into a more suitable place.
-template <Eigen::UpLoType UpLoType>
+template <int UpLoType>
bool SolveLinearSystemUsingEigen(const Matrix& lhs,
const Vector rhs,
Vector* solution) {
