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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/containers/extend.h"
#include <initializer_list>
#include <type_traits>
#include <utility>
#include <vector>
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
struct NonCopyable {
char c_;
explicit NonCopyable(char c) : c_(c) {}
NonCopyable(NonCopyable&&) = default;
NonCopyable& operator=(NonCopyable&& other) = default;
NonCopyable(const NonCopyable&) = delete;
NonCopyable& operator=(const NonCopyable&) = delete;
};
bool operator==(const NonCopyable& a, const NonCopyable& b) {
return a.c_ == b.c_;
}
static_assert(std::is_move_constructible_v<NonCopyable>, "");
static_assert(!std::is_copy_constructible_v<NonCopyable>, "");
struct CopyableMovable {
bool copied_;
char c_;
explicit CopyableMovable(char c) : copied_(false), c_(c) {}
CopyableMovable(const CopyableMovable& other) : copied_(true), c_(other.c_) {}
CopyableMovable& operator=(const CopyableMovable&) = default;
CopyableMovable(CopyableMovable&&) = default;
CopyableMovable& operator=(CopyableMovable&& other) = default;
};
bool operator==(const CopyableMovable& a, const CopyableMovable& b) {
return a.c_ == b.c_;
}
} // namespace
TEST(ExtendTest, ExtendWithMove) {
std::vector<NonCopyable> dst;
for (char c : {'a', 'b', 'c', 'd'})
dst.emplace_back(c);
std::vector<NonCopyable> src;
for (char c : {'e', 'f', 'g'})
src.emplace_back(c);
std::vector<NonCopyable> expected;
for (char c : {'a', 'b', 'c', 'd', 'e', 'f', 'g'})
expected.emplace_back(c);
Extend(dst, std::move(src));
EXPECT_EQ(dst, expected);
EXPECT_TRUE(src.empty());
}
TEST(ExtendTest, ExtendCopyableWithMove) {
std::vector<CopyableMovable> dst;
for (char c : {'a', 'b', 'c', 'd'})
dst.emplace_back(c);
std::vector<CopyableMovable> src;
for (char c : {'e', 'f', 'g'})
src.emplace_back(c);
std::vector<CopyableMovable> expected;
for (char c : {'a', 'b', 'c', 'd', 'e', 'f', 'g'})
expected.emplace_back(c);
Extend(dst, std::move(src));
EXPECT_EQ(dst, expected);
EXPECT_TRUE(src.empty());
}
TEST(ExtendTest, ExtendWithCopy) {
std::vector<CopyableMovable> dst;
for (char c : {'a', 'b', 'c', 'd'})
dst.emplace_back(c);
std::vector<CopyableMovable> src;
for (char c : {'e', 'f', 'g'})
src.emplace_back(c);
std::vector<CopyableMovable> expected;
for (char c : {'a', 'b', 'c', 'd', 'e', 'f', 'g'})
expected.emplace_back(c);
EXPECT_FALSE(dst[0].copied_);
Extend(dst, src);
EXPECT_EQ(dst, expected);
EXPECT_FALSE(dst[0].copied_);
EXPECT_TRUE(dst[dst.size() - 1].copied_);
}
} // namespace base
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