base/containers/vector_buffer_unittest.cc

// Copyright 2017 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/containers/vector_buffer.h"

#include "base/test/copy_only_int.h"
#include "base/test/move_only_int.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace base {
namespace internal {

TEST(VectorBuffer, DeletePOD) {
  constexpr int size = 10;
  VectorBuffer<int> buffer(size);
  for (int i = 0; i < size; i++)
    buffer.begin()[i] = i + 1;

  buffer.DestructRange(buffer.begin(), buffer.end());

  // Delete should do nothing.
  for (int i = 0; i < size; i++)
    EXPECT_EQ(i + 1, buffer.begin()[i]);
}

TEST(VectorBuffer, DeleteMoveOnly) {
  constexpr int size = 10;
  VectorBuffer<MoveOnlyInt> buffer(size);
  for (int i = 0; i < size; i++)
    new (buffer.begin() + i) MoveOnlyInt(i + 1);

  buffer.DestructRange(buffer.begin(), buffer.end());

  // Delete should have reset all of the values to 0.
  for (int i = 0; i < size; i++)
    EXPECT_EQ(0, buffer.begin()[i].data());
}

TEST(VectorBuffer, PODMove) {
  constexpr int size = 10;
  VectorBuffer<int> dest(size);

  VectorBuffer<int> original(size);
  for (int i = 0; i < size; i++)
    original.begin()[i] = i + 1;

  original.MoveRange(original.begin(), original.end(), dest.begin());
  for (int i = 0; i < size; i++)
    EXPECT_EQ(i + 1, dest.begin()[i]);
}

TEST(VectorBuffer, MovableMove) {
  constexpr int size = 10;
  VectorBuffer<MoveOnlyInt> dest(size);

  VectorBuffer<MoveOnlyInt> original(size);
  for (int i = 0; i < size; i++)
    new (original.begin() + i) MoveOnlyInt(i + 1);

  original.MoveRange(original.begin(), original.end(), dest.begin());

  // Moving from a MoveOnlyInt resets to 0.
  for (int i = 0; i < size; i++) {
    EXPECT_EQ(0, original.begin()[i].data());
    EXPECT_EQ(i + 1, dest.begin()[i].data());
  }
}

TEST(VectorBuffer, CopyToMove) {
  constexpr int size = 10;
  VectorBuffer<CopyOnlyInt> dest(size);

  VectorBuffer<CopyOnlyInt> original(size);
  for (int i = 0; i < size; i++)
    new (original.begin() + i) CopyOnlyInt(i + 1);

  original.MoveRange(original.begin(), original.end(), dest.begin());

  // The original should have been destructed, which should reset the value to
  // 0. Technically this dereferences the destructed object.
  for (int i = 0; i < size; i++) {
    EXPECT_EQ(0, original.begin()[i].data());
    EXPECT_EQ(i + 1, dest.begin()[i].data());
  }
}

}  // namespace internal
}  // namespace base