Add info() method which can be queried to check whether iteration converged.

Eigen/src/Eigenvalues/EigenvaluesCommon.h

@@ -0,0 +1,39 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2010 Jitse Niesen <jitse@maths.leeds.ac.uk>
+//
+// Eigen is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 3 of the License, or (at your option) any later version.
+//
+// Alternatively, you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License and a copy of the GNU General Public License along with
+// Eigen. If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef EIGEN_EIGENVALUES_COMMON_H
+#define EIGEN_EIGENVALUES_COMMON_H
+
+/** \eigenvalues_module \ingroup Eigenvalues_Module 
+  * \nonstableyet
+  *
+  * \brief Enum for reporting the status of a computation. 
+  */
+enum ComputationInfo {
+  Success = 0,       /**< \brief Computation was successful. */
+  NoConvergence = 1  /**< \brief Iterative procedure did not converge. */
+};
+
+#endif // EIGEN_EIGENVALUES_COMMON_H
+