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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: keir@google.com (Keir Mierle)
+//
+// A jacobian writer that directly writes to compressed row sparse matrices.
+
+#ifndef CERES_INTERNAL_COMPRESSED_ROW_JACOBIAN_WRITER_H_
+#define CERES_INTERNAL_COMPRESSED_ROW_JACOBIAN_WRITER_H_
+
+#include "ceres/evaluator.h"
+#include "ceres/scratch_evaluate_preparer.h"
+
+namespace ceres {
+namespace internal {
+
+class Program;
+class SparseMatrix;
+
+class CompressedRowJacobianWriter {
+ public:
+  CompressedRowJacobianWriter(Evaluator::Options /* ignored */,
+                              Program* program)
+    : program_(program) {
+  }
+
+  // JacobianWriter interface.
+
+  // Since the compressed row matrix has different layout than that assumed by
+  // the cost functions, use scratch space to store the jacobians temporarily
+  // then copy them over to the larger jacobian in the Write() function.
+  ScratchEvaluatePreparer* CreateEvaluatePreparers(int num_threads) {
+    return ScratchEvaluatePreparer::Create(*program_, num_threads);
+  }
+
+  SparseMatrix* CreateJacobian() const;
+
+  void Write(int residual_id,
+             int residual_offset,
+             double **jacobians,
+             SparseMatrix* base_jacobian);
+
+ private:
+  Program* program_;
+};
+
+}  // namespace internal
+}  // namespace ceres
+
+#endif  // CERES_INTERNAL_COMPRESSED_ROW_JACOBIAN_WRITER_H_