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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2015 Google Inc. All rights reserved.
+// http://ceres-solver.org/
+//
+// 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 <memory>
+#include <string>
+#include <vector>
+#include "ceres/sparse_matrix.h"
+#include "ceres/internal/port.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()
+ : num_eliminate_blocks(0) {
+ }
+
+ std::unique_ptr<SparseMatrix> A;
+ std::unique_ptr<double[]> b;
+ std::unique_ptr<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
+ std::unique_ptr<double[]> x;
+ // Solution to min_x |Ax - b|^2 + |Dx|^2
+ std::unique_ptr<double[]> x_D;
+};
+
+// Factories for linear least squares problem.
+LinearLeastSquaresProblem* CreateLinearLeastSquaresProblemFromId(int id);
+
+LinearLeastSquaresProblem* LinearLeastSquaresProblem0();
+LinearLeastSquaresProblem* LinearLeastSquaresProblem1();
+LinearLeastSquaresProblem* LinearLeastSquaresProblem2();
+LinearLeastSquaresProblem* LinearLeastSquaresProblem3();
+LinearLeastSquaresProblem* LinearLeastSquaresProblem4();
+
+// Write the linear least squares problem to disk. The exact format
+// depends on dump_format_type.
+bool DumpLinearLeastSquaresProblem(const std::string& filename_base,
+ 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_