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diff --git a/internal/ceres/line_search_direction.h b/internal/ceres/line_search_direction.h
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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_LINE_SEARCH_DIRECTION_H_
+#define CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_
+
+#include "ceres/internal/eigen.h"
+#include "ceres/line_search_minimizer.h"
+#include "ceres/types.h"
+
+namespace ceres {
+namespace internal {
+
+class LineSearchDirection {
+ public:
+ struct Options {
+ Options()
+ : num_parameters(0),
+ type(LBFGS),
+ nonlinear_conjugate_gradient_type(FLETCHER_REEVES),
+ function_tolerance(1e-12),
+ max_lbfgs_rank(20),
+ use_approximate_eigenvalue_bfgs_scaling(true) {
+ }
+
+ int num_parameters;
+ LineSearchDirectionType type;
+ NonlinearConjugateGradientType nonlinear_conjugate_gradient_type;
+ double function_tolerance;
+ int max_lbfgs_rank;
+ bool use_approximate_eigenvalue_bfgs_scaling;
+ };
+
+ static LineSearchDirection* Create(const Options& options);
+
+ virtual ~LineSearchDirection() {}
+ virtual bool NextDirection(const LineSearchMinimizer::State& previous,
+ const LineSearchMinimizer::State& current,
+ Vector* search_direction) = 0;
+};
+
+} // namespace internal
+} // namespace ceres
+
+#endif // CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_