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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2017 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)
+//
+// A solver for sparse linear least squares problem based on solving
+// the normal equations via a sparse cholesky factorization.
+
+#ifndef CERES_INTERNAL_DYNAMIC_SPARSE_NORMAL_CHOLESKY_SOLVER_H_
+#define CERES_INTERNAL_DYNAMIC_SPARSE_NORMAL_CHOLESKY_SOLVER_H_
+
+// This include must come before any #ifndef check on Ceres compile options.
+#include "ceres/internal/port.h"
+
+#include "ceres/linear_solver.h"
+
+namespace ceres {
+namespace internal {
+
+class CompressedRowSparseMatrix;
+
+// A variant of SparseNormalCholeskySolver in the case where matrix
+// sparsity is not constant across calls to Solve. This means that
+// there is no benefit to symbolically factorizing the matrix and
+// caching this factorization.
+//
+// TODO(alex): Add support for Accelerate sparse solvers:
+// https://github.com/ceres-solver/ceres-solver/issues/397
+class DynamicSparseNormalCholeskySolver
+    : public CompressedRowSparseMatrixSolver {
+ public:
+  explicit DynamicSparseNormalCholeskySolver(
+      const LinearSolver::Options& options);
+  virtual ~DynamicSparseNormalCholeskySolver() {}
+
+ private:
+  LinearSolver::Summary SolveImpl(
+      CompressedRowSparseMatrix* A,
+      const double* b,
+      const LinearSolver::PerSolveOptions& options,
+      double* x) final;
+
+  LinearSolver::Summary SolveImplUsingSuiteSparse(
+      CompressedRowSparseMatrix* A,
+      double* rhs_and_solution);
+
+  LinearSolver::Summary SolveImplUsingCXSparse(
+      CompressedRowSparseMatrix* A,
+      double* rhs_and_solution);
+
+  LinearSolver::Summary SolveImplUsingEigen(
+      CompressedRowSparseMatrix* A,
+      double* rhs_and_solution);
+
+  const LinearSolver::Options options_;
+};
+
+}  // namespace internal
+}  // namespace ceres
+
+#endif  // CERES_INTERNAL_DYNAMIC_SPARSE_NORMAL_CHOLESKY_SOLVER_H_