base/no_destructor_unittest.cc

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/no_destructor.h"

#include <string>
#include <utility>

#include "base/logging.h"
#include "build_config.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace base {

namespace {

struct CheckOnDestroy {
  ~CheckOnDestroy() { CHECK(false); }
};

TEST(NoDestructorTest, SkipsDestructors) {
  NoDestructor<CheckOnDestroy> destructor_should_not_run;
}

struct CopyOnly {
  CopyOnly() = default;

  CopyOnly(const CopyOnly&) = default;
  CopyOnly& operator=(const CopyOnly&) = default;

  CopyOnly(CopyOnly&&) = delete;
  CopyOnly& operator=(CopyOnly&&) = delete;
};

struct MoveOnly {
  MoveOnly() = default;

  MoveOnly(const MoveOnly&) = delete;
  MoveOnly& operator=(const MoveOnly&) = delete;

  MoveOnly(MoveOnly&&) = default;
  MoveOnly& operator=(MoveOnly&&) = default;
};

struct ForwardingTestStruct {
  ForwardingTestStruct(const CopyOnly&, MoveOnly&&) {}
};

TEST(NoDestructorTest, ForwardsArguments) {
  CopyOnly copy_only;
  MoveOnly move_only;

  static NoDestructor<ForwardingTestStruct> test_forwarding(
      copy_only, std::move(move_only));
}

TEST(NoDestructorTest, Accessors) {
  static NoDestructor<std::string> awesome("awesome");

  EXPECT_EQ("awesome", *awesome);
  EXPECT_EQ(0, awesome->compare("awesome"));
  EXPECT_EQ(0, awesome.get()->compare("awesome"));
}

// Passing initializer list to a NoDestructor like in this test
// is ambiguous in GCC.
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84849
#if !defined(COMPILER_GCC) && !defined(__clang__)
TEST(NoDestructorTest, InitializerList) {
  static NoDestructor<std::vector<std::string>> vector({"a", "b", "c"});
}
#endif
}  // namespace

}  // namespace base