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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2010, 2011, 2012 Google Inc. All rights reserved.
+// http://code.google.com/p/ceres-solver/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors may be
+//   used to endorse or promote products derived from this software without
+//   specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: sameeragarwal@google.com (Sameer Agarwal)
+
+#ifndef CERES_INTERNAL_LINEAR_LEAST_SQUARES_PROBLEMS_H_
+#define CERES_INTERNAL_LINEAR_LEAST_SQUARES_PROBLEMS_H_
+
+#include <string>
+#include <vector>
+#include "ceres/sparse_matrix.h"
+#include "ceres/internal/port.h"
+#include "ceres/internal/scoped_ptr.h"
+
+namespace ceres {
+namespace internal {
+
+// Structure defining a linear least squares problem and if possible
+// ground truth solutions. To be used by various LinearSolver tests.
+struct LinearLeastSquaresProblem {
+  LinearLeastSquaresProblem()
+      : A(NULL), b(NULL), D(NULL), num_eliminate_blocks(0),
+        x(NULL), x_D(NULL) {
+  }
+
+  scoped_ptr<SparseMatrix> A;
+  scoped_array<double> b;
+  scoped_array<double> D;
+  // If using the schur eliminator then how many of the variable
+  // blocks are e_type blocks.
+  int num_eliminate_blocks;
+
+  // Solution to min_x |Ax - b|^2
+  scoped_array<double> x;
+  // Solution to min_x |Ax - b|^2 + |Dx|^2
+  scoped_array<double> x_D;
+};
+
+// Factories for linear least squares problem.
+LinearLeastSquaresProblem* CreateLinearLeastSquaresProblemFromId(int id);
+LinearLeastSquaresProblem* CreateLinearLeastSquaresProblemFromFile(
+    const string& filename);
+
+LinearLeastSquaresProblem* LinearLeastSquaresProblem0();
+LinearLeastSquaresProblem* LinearLeastSquaresProblem1();
+LinearLeastSquaresProblem* LinearLeastSquaresProblem2();
+LinearLeastSquaresProblem* LinearLeastSquaresProblem3();
+
+// Write the linear least squares problem to disk. The exact format
+// depends on dump_format_type.
+bool DumpLinearLeastSquaresProblem(const string& directory,
+                              	   int iteration,
+                                   DumpFormatType dump_format_type,
+                                   const SparseMatrix* A,
+                                   const double* D,
+                                   const double* b,
+                                   const double* x,
+                                   int num_eliminate_blocks);
+}  // namespace internal
+}  // namespace ceres
+
+#endif  // CERES_INTERNAL_LINEAR_LEAST_SQUARES_PROBLEMS_H_