diff --git a/internal/ceres/minimizer.cc b/internal/ceres/minimizer.cc
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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)
+
+#include "ceres/line_search_minimizer.h"
+#include "ceres/minimizer.h"
+#include "ceres/trust_region_minimizer.h"
+#include "ceres/types.h"
+#include "glog/logging.h"
+
+namespace ceres {
+namespace internal {
+
+Minimizer* Minimizer::Create(MinimizerType minimizer_type) {
+  if (minimizer_type == TRUST_REGION) {
+    return new TrustRegionMinimizer;
+  }
+
+  if (minimizer_type == LINE_SEARCH) {
+    return new LineSearchMinimizer;
+  }
+
+  LOG(FATAL) << "Unknown minimizer_type: " << minimizer_type;
+  return NULL;
+}
+
+
+Minimizer::~Minimizer() {}
+
+bool Minimizer::RunCallbacks(const Minimizer::Options& options,
+                             const IterationSummary& iteration_summary,
+                             Solver::Summary* summary) {
+  const bool is_not_silent = !options.is_silent;
+  CallbackReturnType status = SOLVER_CONTINUE;
+  int i = 0;
+  while (status == SOLVER_CONTINUE && i < options.callbacks.size()) {
+    status = (*options.callbacks[i])(iteration_summary);
+    ++i;
+  }
+  switch (status) {
+    case SOLVER_CONTINUE:
+      return true;
+    case SOLVER_TERMINATE_SUCCESSFULLY:
+      summary->termination_type = USER_SUCCESS;
+      summary->message =
+          "User callback returned SOLVER_TERMINATE_SUCCESSFULLY.";
+      VLOG_IF(1, is_not_silent) << "Terminating: " << summary->message;
+      return false;
+    case SOLVER_ABORT:
+      summary->termination_type = USER_FAILURE;
+      summary->message = "User callback returned SOLVER_ABORT.";
+      VLOG_IF(1, is_not_silent) << "Terminating: " << summary->message;
+      return false;
+    default:
+      LOG(FATAL) << "Unknown type of user callback status";
+  }
+  return false;
+}
+
+}  // namespace internal
+}  // namespace ceres