Class CustomDeleter

tests/unit_test/sk_unique_ptr_test.cpp:159–164

  custom_delete_count = 0;

  struct CustomDeleter {
    auto operator()(TestObj* ptr) const noexcept -> void {
      ++custom_delete_count;
      delete ptr;
    }
  };

  {
    kstd::unique_ptr<TestObj, CustomDeleter> p(new TestObj(1));