Update Ceres to latest upstream version 2.1.0

This release deprecated the Parameterization API and the new Manifolds
API is to be used instead. This is what was done in the Libmv as part
of this change.

Additionally, remove the bundling scripts. Nowadays those are only
leading to a duplicated work to maintain.

No measurable changes on user side is expected.

1 files changed, 14 insertions, 18 deletions

diff --git a/extern/ceres/internal/ceres/line_search_direction.h b/extern/ceres/internal/ceres/line_search_direction.h
index 2fcf4729ca5..47b256d7133 100644
--- a/extern/ceres/internal/ceres/line_search_direction.h
+++ b/extern/ceres/internal/ceres/line_search_direction.h
@@ -1,5 +1,5 @@
 // Ceres Solver - A fast non-linear least squares minimizer
-// Copyright 2015 Google Inc. All rights reserved.
+// Copyright 2022 Google Inc. All rights reserved.
 // http://ceres-solver.org/
 //
 // Redistribution and use in source and binary forms, with or without
@@ -31,35 +31,31 @@
 #ifndef CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_
 #define CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_
 
+#include <memory>
+
 #include "ceres/internal/eigen.h"
+#include "ceres/internal/export.h"
 #include "ceres/line_search_minimizer.h"
 #include "ceres/types.h"
 
 namespace ceres {
 namespace internal {
 
-class LineSearchDirection {
+class CERES_NO_EXPORT 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;
+    int num_parameters{0};
+    LineSearchDirectionType type{LBFGS};
+    NonlinearConjugateGradientType nonlinear_conjugate_gradient_type{
+        FLETCHER_REEVES};
+    double function_tolerance{1e-12};
+    int max_lbfgs_rank{20};
+    bool use_approximate_eigenvalue_bfgs_scaling{true};
   };
 
-  static LineSearchDirection* Create(const Options& options);
+  static std::unique_ptr<LineSearchDirection> Create(const Options& options);
 
-  virtual ~LineSearchDirection() {}
+  virtual ~LineSearchDirection();
   virtual bool NextDirection(const LineSearchMinimizer::State& previous,
                              const LineSearchMinimizer::State& current,
                              Vector* search_direction) = 0;