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// Copyright 2023 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/to_vector.h"
#include <ranges>
#include <set>
#include "base/containers/adapters.h"
#include "base/containers/flat_set.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base::test {
template <class C>
void IdentityTest() {
C c = {1, 2, 3, 4, 5};
auto vec = ToVector(c);
EXPECT_THAT(vec, testing::ElementsAre(1, 2, 3, 4, 5));
}
template <class C>
void ProjectionTest() {
C c = {1, 2, 3, 4, 5};
auto vec = ToVector(c, [](int x) { return x + 1; });
EXPECT_THAT(vec, testing::ElementsAre(2, 3, 4, 5, 6));
}
TEST(ToVectorTest, Identity) {
IdentityTest<std::vector<int>>();
IdentityTest<std::set<int>>();
IdentityTest<int[]>();
IdentityTest<base::flat_set<int>>();
}
TEST(ToVectorTest, Projection) {
ProjectionTest<std::vector<int>>();
ProjectionTest<std::set<int>>();
ProjectionTest<int[]>();
ProjectionTest<base::flat_set<int>>();
}
TEST(ToVectorTest, MoveOnly) {
std::vector<std::unique_ptr<int>> v;
v.push_back(std::make_unique<int>(1));
v.push_back(std::make_unique<int>(2));
v.push_back(std::make_unique<int>(3));
auto v2 = base::ToVector(base::RangeAsRvalues(std::move(v)));
EXPECT_THAT(v2, testing::ElementsAre(testing::Pointee(1), testing::Pointee(2),
testing::Pointee(3)));
// The old vector should be consumed. The standard guarantees that a
// moved-from std::unique_ptr will be null.
// NOLINT(bugprone-use-after-move)
EXPECT_THAT(v, testing::ElementsAre(testing::IsNull(), testing::IsNull(),
testing::IsNull()));
// Another method which is more verbose so not preferable.
auto v3 = base::ToVector(
std::move(v2), [](std::unique_ptr<int>& p) { return std::move(p); });
EXPECT_THAT(v3, testing::ElementsAre(testing::Pointee(1), testing::Pointee(2),
testing::Pointee(3)));
// NOLINT(bugprone-use-after-move)
EXPECT_THAT(v2, testing::ElementsAre(testing::IsNull(), testing::IsNull(),
testing::IsNull()));
}
template <typename C, typename Proj, typename T>
constexpr bool CorrectlyProjected =
std::is_same_v<T,
typename decltype(ToVector(
std::declval<C>(),
std::declval<Proj>()))::value_type>;
TEST(ToVectorTest, CorrectlyProjected) {
// Tests that projected types are deduced correctly.
constexpr auto proj = [](const auto& value) -> const auto& { return value; };
static_assert(CorrectlyProjected<std::vector<std::string>, decltype(proj),
std::string>);
static_assert(
CorrectlyProjected<std::set<std::string>, decltype(&std::string::length),
std::size_t>);
}
} // namespace base::test
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