internal/ceres/array_selector_test.cc

// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2023 Google Inc. All rights reserved.
// http://code.google.com/p/ceres-solver/
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// Author: darius.rueckert@fau.de (Darius Rueckert)
//

#include "ceres/internal/array_selector.h"

#include <array>
#include <type_traits>
#include <vector>

#include "absl/container/fixed_array.h"
#include "ceres/types.h"
#include "gtest/gtest.h"

namespace ceres::internal {

// This test only checks, if the correct array implementations are selected. The
// test for FixedArray is in fixed_array_test.cc. Tests for std::array and
// std::vector are not included in ceres.
TEST(ArraySelector, FixedArray) {
  ArraySelector<int, DYNAMIC, 20> array1(10);
  static_assert(
      std::is_base_of<absl::FixedArray<int, 20>, decltype(array1)>::value);
  EXPECT_EQ(array1.size(), 10);

  ArraySelector<int, DYNAMIC, 10> array2(20);
  static_assert(
      std::is_base_of<absl::FixedArray<int, 10>, decltype(array2)>::value);
  EXPECT_EQ(array2.size(), 20);
}

TEST(ArraySelector, Array) {
  ArraySelector<int, 10, 20> array1(10);
  static_assert(std::is_base_of<std::array<int, 10>, decltype(array1)>::value);
  EXPECT_EQ(array1.size(), 10);

  ArraySelector<int, 20, 20> array2(20);
  static_assert(std::is_base_of<std::array<int, 20>, decltype(array2)>::value);
  EXPECT_EQ(array2.size(), 20);
}

TEST(ArraySelector, Vector) {
  ArraySelector<int, 20, 10> array1(20);
  static_assert(std::is_base_of<std::vector<int>, decltype(array1)>::value);
  EXPECT_EQ(array1.size(), 20);

  ArraySelector<int, 1, 0> array2(1);
  static_assert(std::is_base_of<std::vector<int>, decltype(array2)>::value);
  EXPECT_EQ(array2.size(), 1);
}

}  // namespace ceres::internal