Replacing old style typedefs with new style usings Change-Id: I85d353708fc431df8312a2337d0508df6aee071f

diff --git a/internal/ceres/accelerate_sparse.h b/internal/ceres/accelerate_sparse.h
index 81f5b94..fdc53e5 100644
--- a/internal/ceres/accelerate_sparse.h
+++ b/internal/ceres/accelerate_sparse.h

@@ -55,18 +55,18 @@
 
 template <>
 struct SparseTypesTrait<double> {
-  typedef DenseVector_Double DenseVector;
-  typedef SparseMatrix_Double SparseMatrix;
-  typedef SparseOpaqueSymbolicFactorization SymbolicFactorization;
-  typedef SparseOpaqueFactorization_Double NumericFactorization;
+  using DenseVector = DenseVector_Double;
+  using SparseMatrix = SparseMatrix_Double;
+  using SymbolicFactorization = SparseOpaqueSymbolicFactorization;
+  using NumericFactorization = SparseOpaqueFactorization_Double;
 };
 
 template <>
 struct SparseTypesTrait<float> {
-  typedef DenseVector_Float DenseVector;
-  typedef SparseMatrix_Float SparseMatrix;
-  typedef SparseOpaqueSymbolicFactorization SymbolicFactorization;
-  typedef SparseOpaqueFactorization_Float NumericFactorization;
+  using DenseVector = DenseVector_Float;
+  using SparseMatrix = SparseMatrix_Float;
+  using SymbolicFactorization = SparseOpaqueSymbolicFactorization;
+  using NumericFactorization = SparseOpaqueFactorization_Float;
 };
 
 template <typename Scalar>

diff --git a/internal/ceres/cost_function_to_functor_test.cc b/internal/ceres/cost_function_to_functor_test.cc
index cf4a57b..3749909 100644
--- a/internal/ceres/cost_function_to_functor_test.cc
+++ b/internal/ceres/cost_function_to_functor_test.cc

@@ -298,20 +298,19 @@
 };
 
 // Check that AutoDiff(Functor1) == AutoDiff(CostToFunctor(AutoDiff(Functor1)))
-#define TEST_BODY(Functor1)                                                    \
-  TEST(CostFunctionToFunctor, Functor1) {                                      \
-    typedef AutoDiffCostFunction<Functor1, 2, PARAMETER_BLOCK_SIZES>           \
-        CostFunction1;                                                         \
-    typedef CostFunctionToFunctor<2, PARAMETER_BLOCK_SIZES> FunctionToFunctor; \
-    typedef AutoDiffCostFunction<FunctionToFunctor, 2, PARAMETER_BLOCK_SIZES>  \
-        CostFunction2;                                                         \
-                                                                               \
-    std::unique_ptr<CostFunction> cost_function(new CostFunction2(             \
-        new FunctionToFunctor(new CostFunction1(new Functor1))));              \
-                                                                               \
-    std::unique_ptr<CostFunction> actual_cost_function(                        \
-        new CostFunction1(new Functor1));                                      \
-    ExpectCostFunctionsAreEqual(*cost_function, *actual_cost_function);        \
+#define TEST_BODY(Functor1)                                                         \
+  TEST(CostFunctionToFunctor, Functor1) {                                           \
+    using CostFunction1 = AutoDiffCostFunction<Functor1, 2, PARAMETER_BLOCK_SIZES>; \
+    using FunctionToFunctor = CostFunctionToFunctor<2, PARAMETER_BLOCK_SIZES>;      \
+    using CostFunction2 =                                                           \
+        AutoDiffCostFunction<FunctionToFunctor, 2, PARAMETER_BLOCK_SIZES>;          \
+                                                                                    \
+    std::unique_ptr<CostFunction> cost_function(new CostFunction2(                  \
+        new FunctionToFunctor(new CostFunction1(new Functor1))));                   \
+                                                                                    \
+    std::unique_ptr<CostFunction> actual_cost_function(                             \
+        new CostFunction1(new Functor1));                                           \
+    ExpectCostFunctionsAreEqual(*cost_function, *actual_cost_function);             \
   }
 
 #define PARAMETER_BLOCK_SIZES 2

diff --git a/internal/ceres/linear_solver.h b/internal/ceres/linear_solver.h
index 757d01e..413160f 100644
--- a/internal/ceres/linear_solver.h
+++ b/internal/ceres/linear_solver.h

@@ -392,10 +392,10 @@
 // Linear solvers that depend on access to the low level structure of
 // a SparseMatrix.
 // clang-format off
-typedef TypedLinearSolver<BlockSparseMatrix>         BlockSparseMatrixSolver;          // NOLINT
-typedef TypedLinearSolver<CompressedRowSparseMatrix> CompressedRowSparseMatrixSolver;  // NOLINT
-typedef TypedLinearSolver<DenseSparseMatrix>         DenseSparseMatrixSolver;          // NOLINT
-typedef TypedLinearSolver<TripletSparseMatrix>       TripletSparseMatrixSolver;        // NOLINT
+using BlockSparseMatrixSolver = TypedLinearSolver<BlockSparseMatrix>;                  // NOLINT
+using CompressedRowSparseMatrixSolver = TypedLinearSolver<CompressedRowSparseMatrix>;  // NOLINT
+using DenseSparseMatrixSolver = TypedLinearSolver<DenseSparseMatrix>;                  // NOLINT
+using TripletSparseMatrixSolver = TypedLinearSolver<TripletSparseMatrix>;              // NOLINT
 // clang-format on
 
 }  // namespace ceres::internal

diff --git a/internal/ceres/suitesparse.h b/internal/ceres/suitesparse.h
index aeea7b2..e00b82d 100644
--- a/internal/ceres/suitesparse.h
+++ b/internal/ceres/suitesparse.h

@@ -274,7 +274,7 @@
 
 #else  // CERES_NO_SUITESPARSE
 
-typedef void cholmod_factor;
+using cholmod_factor = void;
 
 #include "ceres/internal/disable_warnings.h"