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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_BLOCK_RANDOM_ACCESS_DENSE_MATRIX_H_
+#define CERES_INTERNAL_BLOCK_RANDOM_ACCESS_DENSE_MATRIX_H_
+
+#include "ceres/block_random_access_matrix.h"
+
+#include <vector>
+
+#include "ceres/internal/macros.h"
+#include "ceres/internal/port.h"
+#include "ceres/internal/scoped_ptr.h"
+
+namespace ceres {
+namespace internal {
+
+// A square block random accessible matrix with the same row and
+// column block structure. All cells are stored in the same single
+// array, so that its also accessible as a dense matrix of size
+// num_rows x num_cols.
+//
+// This class is NOT thread safe. Since all n^2 cells are stored,
+// GetCell never returns NULL for any (row_block_id, col_block_id)
+// pair.
+//
+// ReturnCell is a nop.
+class BlockRandomAccessDenseMatrix : public BlockRandomAccessMatrix {
+ public:
+  // blocks is a vector of block sizes. The resulting matrix has
+  // blocks.size() * blocks.size() cells.
+  explicit BlockRandomAccessDenseMatrix(const vector<int>& blocks);
+
+  // The destructor is not thread safe. It assumes that no one is
+  // modifying any cells when the matrix is being destroyed.
+  virtual ~BlockRandomAccessDenseMatrix();
+
+  // BlockRandomAccessMatrix interface.
+  virtual CellInfo* GetCell(int row_block_id,
+                            int col_block_id,
+                            int* row,
+                            int* col,
+                            int* row_stride,
+                            int* col_stride);
+
+  // This is not a thread safe method, it assumes that no cell is
+  // locked.
+  virtual void SetZero();
+
+  // Since the matrix is square with the same row and column block
+  // structure, num_rows() = num_cols().
+  virtual int num_rows() const { return num_rows_; }
+  virtual int num_cols() const { return num_rows_; }
+
+  // The underlying matrix storing the cells.
+  const double* values() const { return values_.get(); }
+  double* mutable_values() { return values_.get(); }
+
+ private:
+  CellInfo cell_info_;
+  int num_rows_;
+  vector<int> block_layout_;
+  scoped_array<double> values_;
+
+  CERES_DISALLOW_COPY_AND_ASSIGN(BlockRandomAccessDenseMatrix);
+};
+
+}  // namespace internal
+}  // namespace ceres
+
+#endif  // CERES_INTERNAL_BLOCK_RANDOM_ACCESS_DENSE_MATRIX_H_