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/**
* Copyright (C) 2023-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/unittest/unittest.h"
#include "mongo/util/immutable/vector.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kTest
namespace mongo {
namespace {
class UserDefinedType {
public:
UserDefinedType() = default;
explicit UserDefinedType(int val) : a(val) {}
bool operator==(const UserDefinedType& rhs) const {
return a == rhs.a;
}
private:
int a = 0;
};
TEST(ImmutableUnorderedMap, Basic) {
// Insert some values and verify that the data structure is behaving as expected
immutable::vector<int> v0;
auto v1 = v0.push_back(1);
// Record the pointer to the value at index '0', verify that this doesn't change after
// performing additional modifications
auto* v1Val = &(*v1.begin());
// Create distinct branches of the history from v1. v0 and v1 should be unaffected
auto v2 = v1.update(0, [](int v) { return v += 1; });
auto v3 = v1.push_back(3);
auto v4 = v1.set(0, 4);
// Verify that values are as expected
ASSERT_EQ(v0.size(), 0);
ASSERT_EQ(v1.size(), 1);
ASSERT_EQ(v1.at(0), 1);
ASSERT_EQ(v2.size(), 1);
ASSERT_EQ(v2.at(0), 2);
ASSERT_EQ(v3.size(), 2);
ASSERT_EQ(v3.at(0), 1);
ASSERT_EQ(v3.at(1), 3);
ASSERT_EQ(v4.size(), 1);
ASSERT_EQ(v4.at(0), 4);
// Verify that pointer to v1's value did not change
ASSERT_EQ(&(*v1.begin()), v1Val);
}
TEST(ImmutableUnorderedMap, UserDefinedType) {
immutable::vector<UserDefinedType> v0;
auto v1 = v0.push_back(UserDefinedType(1));
ASSERT_EQ(v1.at(0), UserDefinedType(1));
}
TEST(ImmutableUnorderedMap, BatchWrite) {
immutable::vector<int> v0;
auto transient = v0.transient();
transient.push_back(1);
transient.push_back(2);
immutable::vector<int> v1 = transient.persistent();
ASSERT_EQ(v0.size(), 0);
ASSERT_EQ(v1.size(), 2);
ASSERT_EQ(v1.at(0), 1);
ASSERT_EQ(v1.at(1), 2);
}
TEST(ImmutableUnorderedMap, ExclusiveOwnership) {
immutable::vector<int> v0;
auto v1 = v0.push_back(1);
auto v2 = v1.push_back(2);
auto v3 = v2.push_back(3);
ASSERT_EQ(v1.size(), 1);
ASSERT_EQ(v2.size(), 2);
ASSERT_EQ(v3.size(), 3);
// Claiming exclusive ownership over v3 means v3 will no longer be valid after mutation, but
// older versions should be unperturbed.
auto v4 = std::move(v3).take(0);
ASSERT_EQ(v1.size(), 1);
ASSERT_EQ(v2.size(), 2);
ASSERT_EQ(v4.size(), 0);
}
} // namespace
} // namespace mongo
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