blob: 7bdb46b76173d2fc99edaa3ba5fe70a8b1b3c459 [file] [log] [blame]
// Copyright 2016 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/optional.h"
#include <memory>
#include <set>
#include <string>
#include <vector>
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
using ::testing::ElementsAre;
namespace base {
namespace {
// Object used to test complex object with Optional<T> in addition of the move
// semantics.
class TestObject {
public:
enum class State {
DEFAULT_CONSTRUCTED,
VALUE_CONSTRUCTED,
COPY_CONSTRUCTED,
MOVE_CONSTRUCTED,
MOVED_FROM,
COPY_ASSIGNED,
MOVE_ASSIGNED,
SWAPPED,
};
TestObject() : foo_(0), bar_(0.0), state_(State::DEFAULT_CONSTRUCTED) {}
TestObject(int foo, double bar)
: foo_(foo), bar_(bar), state_(State::VALUE_CONSTRUCTED) {}
TestObject(const TestObject& other)
: foo_(other.foo_),
bar_(other.bar_),
state_(State::COPY_CONSTRUCTED),
move_ctors_count_(other.move_ctors_count_) {}
TestObject(TestObject&& other)
: foo_(std::move(other.foo_)),
bar_(std::move(other.bar_)),
state_(State::MOVE_CONSTRUCTED),
move_ctors_count_(other.move_ctors_count_ + 1) {
other.state_ = State::MOVED_FROM;
}
TestObject& operator=(const TestObject& other) {
foo_ = other.foo_;
bar_ = other.bar_;
state_ = State::COPY_ASSIGNED;
move_ctors_count_ = other.move_ctors_count_;
return *this;
}
TestObject& operator=(TestObject&& other) {
foo_ = other.foo_;
bar_ = other.bar_;
state_ = State::MOVE_ASSIGNED;
move_ctors_count_ = other.move_ctors_count_;
other.state_ = State::MOVED_FROM;
return *this;
}
void Swap(TestObject* other) {
using std::swap;
swap(foo_, other->foo_);
swap(bar_, other->bar_);
swap(move_ctors_count_, other->move_ctors_count_);
state_ = State::SWAPPED;
other->state_ = State::SWAPPED;
}
bool operator==(const TestObject& other) const {
return std::tie(foo_, bar_) == std::tie(other.foo_, other.bar_);
}
bool operator!=(const TestObject& other) const { return !(*this == other); }
int foo() const { return foo_; }
State state() const { return state_; }
int move_ctors_count() const { return move_ctors_count_; }
private:
int foo_;
double bar_;
State state_;
int move_ctors_count_ = 0;
};
// Implementing Swappable concept.
void swap(TestObject& lhs, TestObject& rhs) {
lhs.Swap(&rhs);
}
class NonTriviallyDestructible {
~NonTriviallyDestructible() {}
};
class DeletedDefaultConstructor {
public:
DeletedDefaultConstructor() = delete;
DeletedDefaultConstructor(int foo) : foo_(foo) {}
int foo() const { return foo_; }
private:
int foo_;
};
class DeletedCopy {
public:
explicit DeletedCopy(int foo) : foo_(foo) {}
DeletedCopy(const DeletedCopy&) = delete;
DeletedCopy(DeletedCopy&&) = default;
DeletedCopy& operator=(const DeletedCopy&) = delete;
DeletedCopy& operator=(DeletedCopy&&) = default;
int foo() const { return foo_; }
private:
int foo_;
};
class DeletedMove {
public:
explicit DeletedMove(int foo) : foo_(foo) {}
DeletedMove(const DeletedMove&) = default;
DeletedMove(DeletedMove&&) = delete;
DeletedMove& operator=(const DeletedMove&) = default;
DeletedMove& operator=(DeletedMove&&) = delete;
int foo() const { return foo_; }
private:
int foo_;
};
class NonTriviallyDestructibleDeletedCopyConstructor {
public:
explicit NonTriviallyDestructibleDeletedCopyConstructor(int foo)
: foo_(foo) {}
NonTriviallyDestructibleDeletedCopyConstructor(
const NonTriviallyDestructibleDeletedCopyConstructor&) = delete;
NonTriviallyDestructibleDeletedCopyConstructor(
NonTriviallyDestructibleDeletedCopyConstructor&&) = default;
~NonTriviallyDestructibleDeletedCopyConstructor() {}
int foo() const { return foo_; }
private:
int foo_;
};
class DeleteNewOperators {
public:
void* operator new(size_t) = delete;
void* operator new(size_t, void*) = delete;
void* operator new[](size_t) = delete;
void* operator new[](size_t, void*) = delete;
};
} // anonymous namespace
static_assert(std::is_trivially_destructible<Optional<int>>::value,
"OptionalIsTriviallyDestructible");
static_assert(
!std::is_trivially_destructible<Optional<NonTriviallyDestructible>>::value,
"OptionalIsTriviallyDestructible");
static_assert(sizeof(Optional<int>) == sizeof(internal::OptionalBase<int>),
"internal::{Copy,Move}{Constructible,Assignable} structs "
"should be 0-sized");
TEST(OptionalTest, DefaultConstructor) {
{
constexpr Optional<float> o;
EXPECT_FALSE(o);
}
{
Optional<std::string> o;
EXPECT_FALSE(o);
}
{
Optional<TestObject> o;
EXPECT_FALSE(o);
}
}
TEST(OptionalTest, CopyConstructor) {
{
constexpr Optional<float> first(0.1f);
constexpr Optional<float> other(first);
EXPECT_TRUE(other);
EXPECT_EQ(other.value(), 0.1f);
EXPECT_EQ(first, other);
}
{
Optional<std::string> first("foo");
Optional<std::string> other(first);
EXPECT_TRUE(other);
EXPECT_EQ(other.value(), "foo");
EXPECT_EQ(first, other);
}
{
const Optional<std::string> first("foo");
Optional<std::string> other(first);
EXPECT_TRUE(other);
EXPECT_EQ(other.value(), "foo");
EXPECT_EQ(first, other);
}
{
Optional<TestObject> first(TestObject(3, 0.1));
Optional<TestObject> other(first);
EXPECT_TRUE(!!other);
EXPECT_TRUE(other.value() == TestObject(3, 0.1));
EXPECT_TRUE(first == other);
}
}
TEST(OptionalTest, ValueConstructor) {
{
constexpr float value = 0.1f;
constexpr Optional<float> o(value);
EXPECT_TRUE(o);
EXPECT_EQ(value, o.value());
}
{
std::string value("foo");
Optional<std::string> o(value);
EXPECT_TRUE(o);
EXPECT_EQ(value, o.value());
}
{
TestObject value(3, 0.1);
Optional<TestObject> o(value);
EXPECT_TRUE(o);
EXPECT_EQ(TestObject::State::COPY_CONSTRUCTED, o->state());
EXPECT_EQ(value, o.value());
}
}
TEST(OptionalTest, MoveConstructor) {
{
constexpr Optional<float> first(0.1f);
constexpr Optional<float> second(std::move(first));
EXPECT_TRUE(second.has_value());
EXPECT_EQ(second.value(), 0.1f);
EXPECT_TRUE(first.has_value());
}
{
Optional<std::string> first("foo");
Optional<std::string> second(std::move(first));
EXPECT_TRUE(second.has_value());
EXPECT_EQ("foo", second.value());
EXPECT_TRUE(first.has_value());
}
{
Optional<TestObject> first(TestObject(3, 0.1));
Optional<TestObject> second(std::move(first));
EXPECT_TRUE(second.has_value());
EXPECT_EQ(TestObject::State::MOVE_CONSTRUCTED, second->state());
EXPECT_TRUE(TestObject(3, 0.1) == second.value());
EXPECT_TRUE(first.has_value());
EXPECT_EQ(TestObject::State::MOVED_FROM, first->state());
}
// Even if copy constructor is deleted, move constructor needs to work.
// Note that it couldn't be constexpr.
{
Optional<DeletedCopy> first(in_place, 42);
Optional<DeletedCopy> second(std::move(first));
EXPECT_TRUE(second.has_value());
EXPECT_EQ(42, second->foo());
EXPECT_TRUE(first.has_value());
}
{
Optional<DeletedMove> first(in_place, 42);
Optional<DeletedMove> second(std::move(first));
EXPECT_TRUE(second.has_value());
EXPECT_EQ(42, second->foo());
EXPECT_TRUE(first.has_value());
}
{
Optional<NonTriviallyDestructibleDeletedCopyConstructor> first(in_place,
42);
Optional<NonTriviallyDestructibleDeletedCopyConstructor> second(
std::move(first));
EXPECT_TRUE(second.has_value());
EXPECT_EQ(42, second->foo());
EXPECT_TRUE(first.has_value());
}
}
TEST(OptionalTest, MoveValueConstructor) {
{
constexpr float value = 0.1f;
constexpr Optional<float> o(std::move(value));
EXPECT_TRUE(o);
EXPECT_EQ(0.1f, o.value());
}
{
float value = 0.1f;
Optional<float> o(std::move(value));
EXPECT_TRUE(o);
EXPECT_EQ(0.1f, o.value());
}
{
std::string value("foo");
Optional<std::string> o(std::move(value));
EXPECT_TRUE(o);
EXPECT_EQ("foo", o.value());
}
{
TestObject value(3, 0.1);
Optional<TestObject> o(std::move(value));
EXPECT_TRUE(o);
EXPECT_EQ(TestObject::State::MOVE_CONSTRUCTED, o->state());
EXPECT_EQ(TestObject(3, 0.1), o.value());
}
}
TEST(OptionalTest, ConvertingCopyConstructor) {
{
Optional<int> first(1);
Optional<double> second(first);
EXPECT_TRUE(second.has_value());
EXPECT_EQ(1.0, second.value());
}
// Make sure explicit is not marked for convertible case.
{
Optional<int> o(1);
ignore_result<Optional<double>>(o);
}
}
TEST(OptionalTest, ConvertingMoveConstructor) {
{
Optional<int> first(1);
Optional<double> second(std::move(first));
EXPECT_TRUE(second.has_value());
EXPECT_EQ(1.0, second.value());
}
// Make sure explicit is not marked for convertible case.
{
Optional<int> o(1);
ignore_result<Optional<double>>(std::move(o));
}
{
class Test1 {
public:
explicit Test1(int foo) : foo_(foo) {}
int foo() const { return foo_; }
private:
int foo_;
};
// Not copyable but convertible from Test1.
class Test2 {
public:
Test2(const Test2&) = delete;
explicit Test2(Test1&& other) : bar_(other.foo()) {}
double bar() const { return bar_; }
private:
double bar_;
};
Optional<Test1> first(in_place, 42);
Optional<Test2> second(std::move(first));
EXPECT_TRUE(second.has_value());
EXPECT_EQ(42.0, second->bar());
}
}
TEST(OptionalTest, ConstructorForwardArguments) {
{
constexpr Optional<float> a(base::in_place, 0.1f);
EXPECT_TRUE(a);
EXPECT_EQ(0.1f, a.value());
}
{
Optional<float> a(base::in_place, 0.1f);
EXPECT_TRUE(a);
EXPECT_EQ(0.1f, a.value());
}
{
Optional<std::string> a(base::in_place, "foo");
EXPECT_TRUE(a);
EXPECT_EQ("foo", a.value());
}
{
Optional<TestObject> a(base::in_place, 0, 0.1);
EXPECT_TRUE(!!a);
EXPECT_TRUE(TestObject(0, 0.1) == a.value());
}
}
TEST(OptionalTest, ConstructorForwardInitListAndArguments) {
{
Optional<std::vector<int>> opt(in_place, {3, 1});
EXPECT_TRUE(opt);
EXPECT_THAT(*opt, ElementsAre(3, 1));
EXPECT_EQ(2u, opt->size());
}
{
Optional<std::vector<int>> opt(in_place, {3, 1}, std::allocator<int>());
EXPECT_TRUE(opt);
EXPECT_THAT(*opt, ElementsAre(3, 1));
EXPECT_EQ(2u, opt->size());
}
}
TEST(OptionalTest, ForwardConstructor) {
{
Optional<double> a(1);
EXPECT_TRUE(a.has_value());
EXPECT_EQ(1.0, a.value());
}
// Test that default type of 'U' is value_type.
{
struct TestData {
int a;
double b;
bool c;
};
Optional<TestData> a({1, 2.0, true});
EXPECT_TRUE(a.has_value());
EXPECT_EQ(1, a->a);
EXPECT_EQ(2.0, a->b);
EXPECT_TRUE(a->c);
}
// If T has a constructor with a param Optional<U>, and another ctor with a
// param U, then T(Optional<U>) should be used for Optional<T>(Optional<U>)
// constructor.
{
enum class ParamType {
DEFAULT_CONSTRUCTED,
COPY_CONSTRUCTED,
MOVE_CONSTRUCTED,
INT,
IN_PLACE,
OPTIONAL_INT,
};
struct Test {
Test() : param_type(ParamType::DEFAULT_CONSTRUCTED) {}
Test(const Test& param) : param_type(ParamType::COPY_CONSTRUCTED) {}
Test(Test&& param) : param_type(ParamType::MOVE_CONSTRUCTED) {}
explicit Test(int param) : param_type(ParamType::INT) {}
explicit Test(in_place_t param) : param_type(ParamType::IN_PLACE) {}
explicit Test(Optional<int> param)
: param_type(ParamType::OPTIONAL_INT) {}
ParamType param_type;
};
// Overload resolution with copy-conversion constructor.
{
const Optional<int> arg(in_place, 1);
Optional<Test> testee(arg);
EXPECT_EQ(ParamType::OPTIONAL_INT, testee->param_type);
}
// Overload resolution with move conversion constructor.
{
Optional<Test> testee(Optional<int>(in_place, 1));
EXPECT_EQ(ParamType::OPTIONAL_INT, testee->param_type);
}
// Default constructor should be used.
{
Optional<Test> testee(in_place);
EXPECT_EQ(ParamType::DEFAULT_CONSTRUCTED, testee->param_type);
}
}
{
struct Test {
Test(int a) {} // NOLINT(runtime/explicit)
};
// If T is convertible from U, it is not marked as explicit.
static_assert(std::is_convertible<int, Test>::value,
"Int should be convertible to Test.");
([](Optional<Test> param) {})(1);
}
}
TEST(OptionalTest, NulloptConstructor) {
constexpr Optional<int> a(base::nullopt);
EXPECT_FALSE(a);
}
TEST(OptionalTest, AssignValue) {
{
Optional<float> a;
EXPECT_FALSE(a);
a = 0.1f;
EXPECT_TRUE(a);
Optional<float> b(0.1f);
EXPECT_TRUE(a == b);
}
{
Optional<std::string> a;
EXPECT_FALSE(a);
a = std::string("foo");
EXPECT_TRUE(a);
Optional<std::string> b(std::string("foo"));
EXPECT_EQ(a, b);
}
{
Optional<TestObject> a;
EXPECT_FALSE(!!a);
a = TestObject(3, 0.1);
EXPECT_TRUE(!!a);
Optional<TestObject> b(TestObject(3, 0.1));
EXPECT_TRUE(a == b);
}
{
Optional<TestObject> a = TestObject(4, 1.0);
EXPECT_TRUE(!!a);
a = TestObject(3, 0.1);
EXPECT_TRUE(!!a);
Optional<TestObject> b(TestObject(3, 0.1));
EXPECT_TRUE(a == b);
}
}
TEST(OptionalTest, AssignObject) {
{
Optional<float> a;
Optional<float> b(0.1f);
a = b;
EXPECT_TRUE(a);
EXPECT_EQ(a.value(), 0.1f);
EXPECT_EQ(a, b);
}
{
Optional<std::string> a;
Optional<std::string> b("foo");
a = b;
EXPECT_TRUE(a);
EXPECT_EQ(a.value(), "foo");
EXPECT_EQ(a, b);
}
{
Optional<TestObject> a;
Optional<TestObject> b(TestObject(3, 0.1));
a = b;
EXPECT_TRUE(!!a);
EXPECT_TRUE(a.value() == TestObject(3, 0.1));
EXPECT_TRUE(a == b);
}
{
Optional<TestObject> a(TestObject(4, 1.0));
Optional<TestObject> b(TestObject(3, 0.1));
a = b;
EXPECT_TRUE(!!a);
EXPECT_TRUE(a.value() == TestObject(3, 0.1));
EXPECT_TRUE(a == b);
}
{
Optional<DeletedMove> a(in_place, 42);
Optional<DeletedMove> b;
b = a;
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(a->foo(), b->foo());
}
{
Optional<DeletedMove> a(in_place, 42);
Optional<DeletedMove> b(in_place, 1);
b = a;
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(a->foo(), b->foo());
}
// Converting assignment.
{
Optional<int> a(in_place, 1);
Optional<double> b;
b = a;
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(1, a.value());
EXPECT_EQ(1.0, b.value());
}
{
Optional<int> a(in_place, 42);
Optional<double> b(in_place, 1);
b = a;
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(42, a.value());
EXPECT_EQ(42.0, b.value());
}
{
Optional<int> a;
Optional<double> b(in_place, 1);
b = a;
EXPECT_FALSE(!!a);
EXPECT_FALSE(!!b);
}
}
TEST(OptionalTest, AssignObject_rvalue) {
{
Optional<float> a;
Optional<float> b(0.1f);
a = std::move(b);
EXPECT_TRUE(a);
EXPECT_TRUE(b);
EXPECT_EQ(0.1f, a.value());
}
{
Optional<std::string> a;
Optional<std::string> b("foo");
a = std::move(b);
EXPECT_TRUE(a);
EXPECT_TRUE(b);
EXPECT_EQ("foo", a.value());
}
{
Optional<TestObject> a;
Optional<TestObject> b(TestObject(3, 0.1));
a = std::move(b);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_TRUE(TestObject(3, 0.1) == a.value());
EXPECT_EQ(TestObject::State::MOVE_CONSTRUCTED, a->state());
EXPECT_EQ(TestObject::State::MOVED_FROM, b->state());
}
{
Optional<TestObject> a(TestObject(4, 1.0));
Optional<TestObject> b(TestObject(3, 0.1));
a = std::move(b);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_TRUE(TestObject(3, 0.1) == a.value());
EXPECT_EQ(TestObject::State::MOVE_ASSIGNED, a->state());
EXPECT_EQ(TestObject::State::MOVED_FROM, b->state());
}
{
Optional<DeletedMove> a(in_place, 42);
Optional<DeletedMove> b;
b = std::move(a);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(42, b->foo());
}
{
Optional<DeletedMove> a(in_place, 42);
Optional<DeletedMove> b(in_place, 1);
b = std::move(a);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(42, b->foo());
}
// Converting assignment.
{
Optional<int> a(in_place, 1);
Optional<double> b;
b = std::move(a);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(1.0, b.value());
}
{
Optional<int> a(in_place, 42);
Optional<double> b(in_place, 1);
b = std::move(a);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(42.0, b.value());
}
{
Optional<int> a;
Optional<double> b(in_place, 1);
b = std::move(a);
EXPECT_FALSE(!!a);
EXPECT_FALSE(!!b);
}
}
TEST(OptionalTest, AssignNull) {
{
Optional<float> a(0.1f);
Optional<float> b(0.2f);
a = base::nullopt;
b = base::nullopt;
EXPECT_EQ(a, b);
}
{
Optional<std::string> a("foo");
Optional<std::string> b("bar");
a = base::nullopt;
b = base::nullopt;
EXPECT_EQ(a, b);
}
{
Optional<TestObject> a(TestObject(3, 0.1));
Optional<TestObject> b(TestObject(4, 1.0));
a = base::nullopt;
b = base::nullopt;
EXPECT_TRUE(a == b);
}
}
TEST(OptionalTest, AssignOverload) {
struct Test1 {
enum class State {
CONSTRUCTED,
MOVED,
};
State state = State::CONSTRUCTED;
};
// Here, Optional<Test2> can be assigned from Optioanl<Test1>.
// In case of move, marks MOVED to Test1 instance.
struct Test2 {
enum class State {
DEFAULT_CONSTRUCTED,
COPY_CONSTRUCTED_FROM_TEST1,
MOVE_CONSTRUCTED_FROM_TEST1,
COPY_ASSIGNED_FROM_TEST1,
MOVE_ASSIGNED_FROM_TEST1,
};
Test2() = default;
explicit Test2(const Test1& test1)
: state(State::COPY_CONSTRUCTED_FROM_TEST1) {}
explicit Test2(Test1&& test1) : state(State::MOVE_CONSTRUCTED_FROM_TEST1) {
test1.state = Test1::State::MOVED;
}
Test2& operator=(const Test1& test1) {
state = State::COPY_ASSIGNED_FROM_TEST1;
return *this;
}
Test2& operator=(Test1&& test1) {
state = State::MOVE_ASSIGNED_FROM_TEST1;
test1.state = Test1::State::MOVED;
return *this;
}
State state = State::DEFAULT_CONSTRUCTED;
};
{
Optional<Test1> a(in_place);
Optional<Test2> b;
b = a;
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(Test1::State::CONSTRUCTED, a->state);
EXPECT_EQ(Test2::State::COPY_CONSTRUCTED_FROM_TEST1, b->state);
}
{
Optional<Test1> a(in_place);
Optional<Test2> b(in_place);
b = a;
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(Test1::State::CONSTRUCTED, a->state);
EXPECT_EQ(Test2::State::COPY_ASSIGNED_FROM_TEST1, b->state);
}
{
Optional<Test1> a(in_place);
Optional<Test2> b;
b = std::move(a);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(Test1::State::MOVED, a->state);
EXPECT_EQ(Test2::State::MOVE_CONSTRUCTED_FROM_TEST1, b->state);
}
{
Optional<Test1> a(in_place);
Optional<Test2> b(in_place);
b = std::move(a);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(Test1::State::MOVED, a->state);
EXPECT_EQ(Test2::State::MOVE_ASSIGNED_FROM_TEST1, b->state);
}
// Similar to Test2, but Test3 also has copy/move ctor and assign operators
// from Optional<Test1>, too. In this case, for a = b where a is
// Optional<Test3> and b is Optional<Test1>,
// Optional<T>::operator=(U&&) where U is Optional<Test1> should be used
// rather than Optional<T>::operator=(Optional<U>&&) where U is Test1.
struct Test3 {
enum class State {
DEFAULT_CONSTRUCTED,
COPY_CONSTRUCTED_FROM_TEST1,
MOVE_CONSTRUCTED_FROM_TEST1,
COPY_CONSTRUCTED_FROM_OPTIONAL_TEST1,
MOVE_CONSTRUCTED_FROM_OPTIONAL_TEST1,
COPY_ASSIGNED_FROM_TEST1,
MOVE_ASSIGNED_FROM_TEST1,
COPY_ASSIGNED_FROM_OPTIONAL_TEST1,
MOVE_ASSIGNED_FROM_OPTIONAL_TEST1,
};
Test3() = default;
explicit Test3(const Test1& test1)
: state(State::COPY_CONSTRUCTED_FROM_TEST1) {}
explicit Test3(Test1&& test1) : state(State::MOVE_CONSTRUCTED_FROM_TEST1) {
test1.state = Test1::State::MOVED;
}
explicit Test3(const Optional<Test1>& test1)
: state(State::COPY_CONSTRUCTED_FROM_OPTIONAL_TEST1) {}
explicit Test3(Optional<Test1>&& test1)
: state(State::MOVE_CONSTRUCTED_FROM_OPTIONAL_TEST1) {
// In the following senarios, given |test1| should always have value.
DCHECK(test1.has_value());
test1->state = Test1::State::MOVED;
}
Test3& operator=(const Test1& test1) {
state = State::COPY_ASSIGNED_FROM_TEST1;
return *this;
}
Test3& operator=(Test1&& test1) {
state = State::MOVE_ASSIGNED_FROM_TEST1;
test1.state = Test1::State::MOVED;
return *this;
}
Test3& operator=(const Optional<Test1>& test1) {
state = State::COPY_ASSIGNED_FROM_OPTIONAL_TEST1;
return *this;
}
Test3& operator=(Optional<Test1>&& test1) {
state = State::MOVE_ASSIGNED_FROM_OPTIONAL_TEST1;
// In the following senarios, given |test1| should always have value.
DCHECK(test1.has_value());
test1->state = Test1::State::MOVED;
return *this;
}
State state = State::DEFAULT_CONSTRUCTED;
};
{
Optional<Test1> a(in_place);
Optional<Test3> b;
b = a;
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(Test1::State::CONSTRUCTED, a->state);
EXPECT_EQ(Test3::State::COPY_CONSTRUCTED_FROM_OPTIONAL_TEST1, b->state);
}
{
Optional<Test1> a(in_place);
Optional<Test3> b(in_place);
b = a;
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(Test1::State::CONSTRUCTED, a->state);
EXPECT_EQ(Test3::State::COPY_ASSIGNED_FROM_OPTIONAL_TEST1, b->state);
}
{
Optional<Test1> a(in_place);
Optional<Test3> b;
b = std::move(a);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(Test1::State::MOVED, a->state);
EXPECT_EQ(Test3::State::MOVE_CONSTRUCTED_FROM_OPTIONAL_TEST1, b->state);
}
{
Optional<Test1> a(in_place);
Optional<Test3> b(in_place);
b = std::move(a);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_EQ(Test1::State::MOVED, a->state);
EXPECT_EQ(Test3::State::MOVE_ASSIGNED_FROM_OPTIONAL_TEST1, b->state);
}
}
TEST(OptionalTest, OperatorStar) {
{
Optional<float> a(0.1f);
EXPECT_EQ(a.value(), *a);
}
{
Optional<std::string> a("foo");
EXPECT_EQ(a.value(), *a);
}
{
Optional<TestObject> a(TestObject(3, 0.1));
EXPECT_EQ(a.value(), *a);
}
}
TEST(OptionalTest, OperatorStar_rvalue) {
EXPECT_EQ(0.1f, *Optional<float>(0.1f));
EXPECT_EQ(std::string("foo"), *Optional<std::string>("foo"));
EXPECT_TRUE(TestObject(3, 0.1) == *Optional<TestObject>(TestObject(3, 0.1)));
}
TEST(OptionalTest, OperatorArrow) {
Optional<TestObject> a(TestObject(3, 0.1));
EXPECT_EQ(a->foo(), 3);
}
TEST(OptionalTest, Value_rvalue) {
EXPECT_EQ(0.1f, Optional<float>(0.1f).value());
EXPECT_EQ(std::string("foo"), Optional<std::string>("foo").value());
EXPECT_TRUE(TestObject(3, 0.1) ==
Optional<TestObject>(TestObject(3, 0.1)).value());
}
TEST(OptionalTest, ValueOr) {
{
Optional<float> a;
EXPECT_EQ(0.0f, a.value_or(0.0f));
a = 0.1f;
EXPECT_EQ(0.1f, a.value_or(0.0f));
a = base::nullopt;
EXPECT_EQ(0.0f, a.value_or(0.0f));
}
// value_or() can be constexpr.
{
constexpr Optional<int> a(in_place, 1);
constexpr int value = a.value_or(10);
EXPECT_EQ(1, value);
}
{
constexpr Optional<int> a;
constexpr int value = a.value_or(10);
EXPECT_EQ(10, value);
}
{
Optional<std::string> a;
EXPECT_EQ("bar", a.value_or("bar"));
a = std::string("foo");
EXPECT_EQ(std::string("foo"), a.value_or("bar"));
a = base::nullopt;
EXPECT_EQ(std::string("bar"), a.value_or("bar"));
}
{
Optional<TestObject> a;
EXPECT_TRUE(a.value_or(TestObject(1, 0.3)) == TestObject(1, 0.3));
a = TestObject(3, 0.1);
EXPECT_TRUE(a.value_or(TestObject(1, 0.3)) == TestObject(3, 0.1));
a = base::nullopt;
EXPECT_TRUE(a.value_or(TestObject(1, 0.3)) == TestObject(1, 0.3));
}
}
TEST(OptionalTest, Swap_bothNoValue) {
Optional<TestObject> a, b;
a.swap(b);
EXPECT_FALSE(a);
EXPECT_FALSE(b);
EXPECT_TRUE(TestObject(42, 0.42) == a.value_or(TestObject(42, 0.42)));
EXPECT_TRUE(TestObject(42, 0.42) == b.value_or(TestObject(42, 0.42)));
}
TEST(OptionalTest, Swap_inHasValue) {
Optional<TestObject> a(TestObject(1, 0.3));
Optional<TestObject> b;
a.swap(b);
EXPECT_FALSE(a);
EXPECT_TRUE(!!b);
EXPECT_TRUE(TestObject(42, 0.42) == a.value_or(TestObject(42, 0.42)));
EXPECT_TRUE(TestObject(1, 0.3) == b.value_or(TestObject(42, 0.42)));
}
TEST(OptionalTest, Swap_outHasValue) {
Optional<TestObject> a;
Optional<TestObject> b(TestObject(1, 0.3));
a.swap(b);
EXPECT_TRUE(!!a);
EXPECT_FALSE(!!b);
EXPECT_TRUE(TestObject(1, 0.3) == a.value_or(TestObject(42, 0.42)));
EXPECT_TRUE(TestObject(42, 0.42) == b.value_or(TestObject(42, 0.42)));
}
TEST(OptionalTest, Swap_bothValue) {
Optional<TestObject> a(TestObject(0, 0.1));
Optional<TestObject> b(TestObject(1, 0.3));
a.swap(b);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_TRUE(TestObject(1, 0.3) == a.value_or(TestObject(42, 0.42)));
EXPECT_TRUE(TestObject(0, 0.1) == b.value_or(TestObject(42, 0.42)));
EXPECT_EQ(TestObject::State::SWAPPED, a->state());
EXPECT_EQ(TestObject::State::SWAPPED, b->state());
}
TEST(OptionalTest, Emplace) {
{
Optional<float> a(0.1f);
EXPECT_EQ(0.3f, a.emplace(0.3f));
EXPECT_TRUE(a);
EXPECT_EQ(0.3f, a.value());
}
{
Optional<std::string> a("foo");
EXPECT_EQ("bar", a.emplace("bar"));
EXPECT_TRUE(a);
EXPECT_EQ("bar", a.value());
}
{
Optional<TestObject> a(TestObject(0, 0.1));
EXPECT_EQ(TestObject(1, 0.2), a.emplace(TestObject(1, 0.2)));
EXPECT_TRUE(!!a);
EXPECT_TRUE(TestObject(1, 0.2) == a.value());
}
{
Optional<std::vector<int>> a;
auto& ref = a.emplace({2, 3});
static_assert(std::is_same<std::vector<int>&, decltype(ref)>::value, "");
EXPECT_TRUE(a);
EXPECT_THAT(*a, ElementsAre(2, 3));
EXPECT_EQ(&ref, &*a);
}
{
Optional<std::vector<int>> a;
auto& ref = a.emplace({4, 5}, std::allocator<int>());
static_assert(std::is_same<std::vector<int>&, decltype(ref)>::value, "");
EXPECT_TRUE(a);
EXPECT_THAT(*a, ElementsAre(4, 5));
EXPECT_EQ(&ref, &*a);
}
}
TEST(OptionalTest, Equals_TwoEmpty) {
Optional<int> a;
Optional<int> b;
EXPECT_TRUE(a == b);
}
TEST(OptionalTest, Equals_TwoEquals) {
Optional<int> a(1);
Optional<int> b(1);
EXPECT_TRUE(a == b);
}
TEST(OptionalTest, Equals_OneEmpty) {
Optional<int> a;
Optional<int> b(1);
EXPECT_FALSE(a == b);
}
TEST(OptionalTest, Equals_TwoDifferent) {
Optional<int> a(0);
Optional<int> b(1);
EXPECT_FALSE(a == b);
}
TEST(OptionalTest, Equals_DifferentType) {
Optional<int> a(0);
Optional<double> b(0);
EXPECT_TRUE(a == b);
}
TEST(OptionalTest, NotEquals_TwoEmpty) {
Optional<int> a;
Optional<int> b;
EXPECT_FALSE(a != b);
}
TEST(OptionalTest, NotEquals_TwoEquals) {
Optional<int> a(1);
Optional<int> b(1);
EXPECT_FALSE(a != b);
}
TEST(OptionalTest, NotEquals_OneEmpty) {
Optional<int> a;
Optional<int> b(1);
EXPECT_TRUE(a != b);
}
TEST(OptionalTest, NotEquals_TwoDifferent) {
Optional<int> a(0);
Optional<int> b(1);
EXPECT_TRUE(a != b);
}
TEST(OptionalTest, NotEquals_DifferentType) {
Optional<int> a(0);
Optional<double> b(0.0);
EXPECT_FALSE(a != b);
}
TEST(OptionalTest, Less_LeftEmpty) {
Optional<int> l;
Optional<int> r(1);
EXPECT_TRUE(l < r);
}
TEST(OptionalTest, Less_RightEmpty) {
Optional<int> l(1);
Optional<int> r;
EXPECT_FALSE(l < r);
}
TEST(OptionalTest, Less_BothEmpty) {
Optional<int> l;
Optional<int> r;
EXPECT_FALSE(l < r);
}
TEST(OptionalTest, Less_BothValues) {
{
Optional<int> l(1);
Optional<int> r(2);
EXPECT_TRUE(l < r);
}
{
Optional<int> l(2);
Optional<int> r(1);
EXPECT_FALSE(l < r);
}
{
Optional<int> l(1);
Optional<int> r(1);
EXPECT_FALSE(l < r);
}
}
TEST(OptionalTest, Less_DifferentType) {
Optional<int> l(1);
Optional<double> r(2.0);
EXPECT_TRUE(l < r);
}
TEST(OptionalTest, LessEq_LeftEmpty) {
Optional<int> l;
Optional<int> r(1);
EXPECT_TRUE(l <= r);
}
TEST(OptionalTest, LessEq_RightEmpty) {
Optional<int> l(1);
Optional<int> r;
EXPECT_FALSE(l <= r);
}
TEST(OptionalTest, LessEq_BothEmpty) {
Optional<int> l;
Optional<int> r;
EXPECT_TRUE(l <= r);
}
TEST(OptionalTest, LessEq_BothValues) {
{
Optional<int> l(1);
Optional<int> r(2);
EXPECT_TRUE(l <= r);
}
{
Optional<int> l(2);
Optional<int> r(1);
EXPECT_FALSE(l <= r);
}
{
Optional<int> l(1);
Optional<int> r(1);
EXPECT_TRUE(l <= r);
}
}
TEST(OptionalTest, LessEq_DifferentType) {
Optional<int> l(1);
Optional<double> r(2.0);
EXPECT_TRUE(l <= r);
}
TEST(OptionalTest, Greater_BothEmpty) {
Optional<int> l;
Optional<int> r;
EXPECT_FALSE(l > r);
}
TEST(OptionalTest, Greater_LeftEmpty) {
Optional<int> l;
Optional<int> r(1);
EXPECT_FALSE(l > r);
}
TEST(OptionalTest, Greater_RightEmpty) {
Optional<int> l(1);
Optional<int> r;
EXPECT_TRUE(l > r);
}
TEST(OptionalTest, Greater_BothValue) {
{
Optional<int> l(1);
Optional<int> r(2);
EXPECT_FALSE(l > r);
}
{
Optional<int> l(2);
Optional<int> r(1);
EXPECT_TRUE(l > r);
}
{
Optional<int> l(1);
Optional<int> r(1);
EXPECT_FALSE(l > r);
}
}
TEST(OptionalTest, Greater_DifferentType) {
Optional<int> l(1);
Optional<double> r(2.0);
EXPECT_FALSE(l > r);
}
TEST(OptionalTest, GreaterEq_BothEmpty) {
Optional<int> l;
Optional<int> r;
EXPECT_TRUE(l >= r);
}
TEST(OptionalTest, GreaterEq_LeftEmpty) {
Optional<int> l;
Optional<int> r(1);
EXPECT_FALSE(l >= r);
}
TEST(OptionalTest, GreaterEq_RightEmpty) {
Optional<int> l(1);
Optional<int> r;
EXPECT_TRUE(l >= r);
}
TEST(OptionalTest, GreaterEq_BothValue) {
{
Optional<int> l(1);
Optional<int> r(2);
EXPECT_FALSE(l >= r);
}
{
Optional<int> l(2);
Optional<int> r(1);
EXPECT_TRUE(l >= r);
}
{
Optional<int> l(1);
Optional<int> r(1);
EXPECT_TRUE(l >= r);
}
}
TEST(OptionalTest, GreaterEq_DifferentType) {
Optional<int> l(1);
Optional<double> r(2.0);
EXPECT_FALSE(l >= r);
}
TEST(OptionalTest, OptNullEq) {
{
Optional<int> opt;
EXPECT_TRUE(opt == base::nullopt);
}
{
Optional<int> opt(1);
EXPECT_FALSE(opt == base::nullopt);
}
}
TEST(OptionalTest, NullOptEq) {
{
Optional<int> opt;
EXPECT_TRUE(base::nullopt == opt);
}
{
Optional<int> opt(1);
EXPECT_FALSE(base::nullopt == opt);
}
}
TEST(OptionalTest, OptNullNotEq) {
{
Optional<int> opt;
EXPECT_FALSE(opt != base::nullopt);
}
{
Optional<int> opt(1);
EXPECT_TRUE(opt != base::nullopt);
}
}
TEST(OptionalTest, NullOptNotEq) {
{
Optional<int> opt;
EXPECT_FALSE(base::nullopt != opt);
}
{
Optional<int> opt(1);
EXPECT_TRUE(base::nullopt != opt);
}
}
TEST(OptionalTest, OptNullLower) {
{
Optional<int> opt;
EXPECT_FALSE(opt < base::nullopt);
}
{
Optional<int> opt(1);
EXPECT_FALSE(opt < base::nullopt);
}
}
TEST(OptionalTest, NullOptLower) {
{
Optional<int> opt;
EXPECT_FALSE(base::nullopt < opt);
}
{
Optional<int> opt(1);
EXPECT_TRUE(base::nullopt < opt);
}
}
TEST(OptionalTest, OptNullLowerEq) {
{
Optional<int> opt;
EXPECT_TRUE(opt <= base::nullopt);
}
{
Optional<int> opt(1);
EXPECT_FALSE(opt <= base::nullopt);
}
}
TEST(OptionalTest, NullOptLowerEq) {
{
Optional<int> opt;
EXPECT_TRUE(base::nullopt <= opt);
}
{
Optional<int> opt(1);
EXPECT_TRUE(base::nullopt <= opt);
}
}
TEST(OptionalTest, OptNullGreater) {
{
Optional<int> opt;
EXPECT_FALSE(opt > base::nullopt);
}
{
Optional<int> opt(1);
EXPECT_TRUE(opt > base::nullopt);
}
}
TEST(OptionalTest, NullOptGreater) {
{
Optional<int> opt;
EXPECT_FALSE(base::nullopt > opt);
}
{
Optional<int> opt(1);
EXPECT_FALSE(base::nullopt > opt);
}
}
TEST(OptionalTest, OptNullGreaterEq) {
{
Optional<int> opt;
EXPECT_TRUE(opt >= base::nullopt);
}
{
Optional<int> opt(1);
EXPECT_TRUE(opt >= base::nullopt);
}
}
TEST(OptionalTest, NullOptGreaterEq) {
{
Optional<int> opt;
EXPECT_TRUE(base::nullopt >= opt);
}
{
Optional<int> opt(1);
EXPECT_FALSE(base::nullopt >= opt);
}
}
TEST(OptionalTest, ValueEq_Empty) {
Optional<int> opt;
EXPECT_FALSE(opt == 1);
}
TEST(OptionalTest, ValueEq_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_FALSE(opt == 1);
}
{
Optional<int> opt(1);
EXPECT_TRUE(opt == 1);
}
}
TEST(OptionalTest, ValueEq_DifferentType) {
Optional<int> opt(0);
EXPECT_TRUE(opt == 0.0);
}
TEST(OptionalTest, EqValue_Empty) {
Optional<int> opt;
EXPECT_FALSE(1 == opt);
}
TEST(OptionalTest, EqValue_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_FALSE(1 == opt);
}
{
Optional<int> opt(1);
EXPECT_TRUE(1 == opt);
}
}
TEST(OptionalTest, EqValue_DifferentType) {
Optional<int> opt(0);
EXPECT_TRUE(0.0 == opt);
}
TEST(OptionalTest, ValueNotEq_Empty) {
Optional<int> opt;
EXPECT_TRUE(opt != 1);
}
TEST(OptionalTest, ValueNotEq_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_TRUE(opt != 1);
}
{
Optional<int> opt(1);
EXPECT_FALSE(opt != 1);
}
}
TEST(OPtionalTest, ValueNotEq_DifferentType) {
Optional<int> opt(0);
EXPECT_FALSE(opt != 0.0);
}
TEST(OptionalTest, NotEqValue_Empty) {
Optional<int> opt;
EXPECT_TRUE(1 != opt);
}
TEST(OptionalTest, NotEqValue_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_TRUE(1 != opt);
}
{
Optional<int> opt(1);
EXPECT_FALSE(1 != opt);
}
}
TEST(OptionalTest, NotEqValue_DifferentType) {
Optional<int> opt(0);
EXPECT_FALSE(0.0 != opt);
}
TEST(OptionalTest, ValueLess_Empty) {
Optional<int> opt;
EXPECT_TRUE(opt < 1);
}
TEST(OptionalTest, ValueLess_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_TRUE(opt < 1);
}
{
Optional<int> opt(1);
EXPECT_FALSE(opt < 1);
}
{
Optional<int> opt(2);
EXPECT_FALSE(opt < 1);
}
}
TEST(OPtionalTest, ValueLess_DifferentType) {
Optional<int> opt(0);
EXPECT_TRUE(opt < 1.0);
}
TEST(OptionalTest, LessValue_Empty) {
Optional<int> opt;
EXPECT_FALSE(1 < opt);
}
TEST(OptionalTest, LessValue_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_FALSE(1 < opt);
}
{
Optional<int> opt(1);
EXPECT_FALSE(1 < opt);
}
{
Optional<int> opt(2);
EXPECT_TRUE(1 < opt);
}
}
TEST(OptionalTest, LessValue_DifferentType) {
Optional<int> opt(0);
EXPECT_FALSE(0.0 < opt);
}
TEST(OptionalTest, ValueLessEq_Empty) {
Optional<int> opt;
EXPECT_TRUE(opt <= 1);
}
TEST(OptionalTest, ValueLessEq_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_TRUE(opt <= 1);
}
{
Optional<int> opt(1);
EXPECT_TRUE(opt <= 1);
}
{
Optional<int> opt(2);
EXPECT_FALSE(opt <= 1);
}
}
TEST(OptionalTest, ValueLessEq_DifferentType) {
Optional<int> opt(0);
EXPECT_TRUE(opt <= 0.0);
}
TEST(OptionalTest, LessEqValue_Empty) {
Optional<int> opt;
EXPECT_FALSE(1 <= opt);
}
TEST(OptionalTest, LessEqValue_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_FALSE(1 <= opt);
}
{
Optional<int> opt(1);
EXPECT_TRUE(1 <= opt);
}
{
Optional<int> opt(2);
EXPECT_TRUE(1 <= opt);
}
}
TEST(OptionalTest, LessEqValue_DifferentType) {
Optional<int> opt(0);
EXPECT_TRUE(0.0 <= opt);
}
TEST(OptionalTest, ValueGreater_Empty) {
Optional<int> opt;
EXPECT_FALSE(opt > 1);
}
TEST(OptionalTest, ValueGreater_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_FALSE(opt > 1);
}
{
Optional<int> opt(1);
EXPECT_FALSE(opt > 1);
}
{
Optional<int> opt(2);
EXPECT_TRUE(opt > 1);
}
}
TEST(OptionalTest, ValueGreater_DifferentType) {
Optional<int> opt(0);
EXPECT_FALSE(opt > 0.0);
}
TEST(OptionalTest, GreaterValue_Empty) {
Optional<int> opt;
EXPECT_TRUE(1 > opt);
}
TEST(OptionalTest, GreaterValue_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_TRUE(1 > opt);
}
{
Optional<int> opt(1);
EXPECT_FALSE(1 > opt);
}
{
Optional<int> opt(2);
EXPECT_FALSE(1 > opt);
}
}
TEST(OptionalTest, GreaterValue_DifferentType) {
Optional<int> opt(0);
EXPECT_FALSE(0.0 > opt);
}
TEST(OptionalTest, ValueGreaterEq_Empty) {
Optional<int> opt;
EXPECT_FALSE(opt >= 1);
}
TEST(OptionalTest, ValueGreaterEq_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_FALSE(opt >= 1);
}
{
Optional<int> opt(1);
EXPECT_TRUE(opt >= 1);
}
{
Optional<int> opt(2);
EXPECT_TRUE(opt >= 1);
}
}
TEST(OptionalTest, ValueGreaterEq_DifferentType) {
Optional<int> opt(0);
EXPECT_TRUE(opt <= 0.0);
}
TEST(OptionalTest, GreaterEqValue_Empty) {
Optional<int> opt;
EXPECT_TRUE(1 >= opt);
}
TEST(OptionalTest, GreaterEqValue_NotEmpty) {
{
Optional<int> opt(0);
EXPECT_TRUE(1 >= opt);
}
{
Optional<int> opt(1);
EXPECT_TRUE(1 >= opt);
}
{
Optional<int> opt(2);
EXPECT_FALSE(1 >= opt);
}
}
TEST(OptionalTest, GreaterEqValue_DifferentType) {
Optional<int> opt(0);
EXPECT_TRUE(0.0 >= opt);
}
TEST(OptionalTest, NotEquals) {
{
Optional<float> a(0.1f);
Optional<float> b(0.2f);
EXPECT_NE(a, b);
}
{
Optional<std::string> a("foo");
Optional<std::string> b("bar");
EXPECT_NE(a, b);
}
{
Optional<int> a(1);
Optional<double> b(2);
EXPECT_NE(a, b);
}
{
Optional<TestObject> a(TestObject(3, 0.1));
Optional<TestObject> b(TestObject(4, 1.0));
EXPECT_TRUE(a != b);
}
}
TEST(OptionalTest, NotEqualsNull) {
{
Optional<float> a(0.1f);
Optional<float> b(0.1f);
b = base::nullopt;
EXPECT_NE(a, b);
}
{
Optional<std::string> a("foo");
Optional<std::string> b("foo");
b = base::nullopt;
EXPECT_NE(a, b);
}
{
Optional<TestObject> a(TestObject(3, 0.1));
Optional<TestObject> b(TestObject(3, 0.1));
b = base::nullopt;
EXPECT_TRUE(a != b);
}
}
TEST(OptionalTest, MakeOptional) {
{
Optional<float> o = make_optional(32.f);
EXPECT_TRUE(o);
EXPECT_EQ(32.f, *o);
float value = 3.f;
o = make_optional(std::move(value));
EXPECT_TRUE(o);
EXPECT_EQ(3.f, *o);
}
{
Optional<std::string> o = make_optional(std::string("foo"));
EXPECT_TRUE(o);
EXPECT_EQ("foo", *o);
std::string value = "bar";
o = make_optional(std::move(value));
EXPECT_TRUE(o);
EXPECT_EQ(std::string("bar"), *o);
}
{
Optional<TestObject> o = make_optional(TestObject(3, 0.1));
EXPECT_TRUE(!!o);
EXPECT_TRUE(TestObject(3, 0.1) == *o);
TestObject value = TestObject(0, 0.42);
o = make_optional(std::move(value));
EXPECT_TRUE(!!o);
EXPECT_TRUE(TestObject(0, 0.42) == *o);
EXPECT_EQ(TestObject::State::MOVED_FROM, value.state());
EXPECT_EQ(TestObject::State::MOVE_ASSIGNED, o->state());
EXPECT_EQ(TestObject::State::MOVE_CONSTRUCTED,
base::make_optional(std::move(value))->state());
}
{
struct Test {
Test(int a, double b, bool c) : a(a), b(b), c(c) {}
int a;
double b;
bool c;
};
Optional<Test> o = make_optional<Test>(1, 2.0, true);
EXPECT_TRUE(!!o);
EXPECT_EQ(1, o->a);
EXPECT_EQ(2.0, o->b);
EXPECT_TRUE(o->c);
}
{
auto str1 = make_optional<std::string>({'1', '2', '3'});
EXPECT_EQ("123", *str1);
auto str2 =
make_optional<std::string>({'a', 'b', 'c'}, std::allocator<char>());
EXPECT_EQ("abc", *str2);
}
}
TEST(OptionalTest, NonMemberSwap_bothNoValue) {
Optional<TestObject> a, b;
base::swap(a, b);
EXPECT_FALSE(!!a);
EXPECT_FALSE(!!b);
EXPECT_TRUE(TestObject(42, 0.42) == a.value_or(TestObject(42, 0.42)));
EXPECT_TRUE(TestObject(42, 0.42) == b.value_or(TestObject(42, 0.42)));
}
TEST(OptionalTest, NonMemberSwap_inHasValue) {
Optional<TestObject> a(TestObject(1, 0.3));
Optional<TestObject> b;
base::swap(a, b);
EXPECT_FALSE(!!a);
EXPECT_TRUE(!!b);
EXPECT_TRUE(TestObject(42, 0.42) == a.value_or(TestObject(42, 0.42)));
EXPECT_TRUE(TestObject(1, 0.3) == b.value_or(TestObject(42, 0.42)));
}
TEST(OptionalTest, NonMemberSwap_outHasValue) {
Optional<TestObject> a;
Optional<TestObject> b(TestObject(1, 0.3));
base::swap(a, b);
EXPECT_TRUE(!!a);
EXPECT_FALSE(!!b);
EXPECT_TRUE(TestObject(1, 0.3) == a.value_or(TestObject(42, 0.42)));
EXPECT_TRUE(TestObject(42, 0.42) == b.value_or(TestObject(42, 0.42)));
}
TEST(OptionalTest, NonMemberSwap_bothValue) {
Optional<TestObject> a(TestObject(0, 0.1));
Optional<TestObject> b(TestObject(1, 0.3));
base::swap(a, b);
EXPECT_TRUE(!!a);
EXPECT_TRUE(!!b);
EXPECT_TRUE(TestObject(1, 0.3) == a.value_or(TestObject(42, 0.42)));
EXPECT_TRUE(TestObject(0, 0.1) == b.value_or(TestObject(42, 0.42)));
EXPECT_EQ(TestObject::State::SWAPPED, a->state());
EXPECT_EQ(TestObject::State::SWAPPED, b->state());
}
TEST(OptionalTest, Hash_OptionalReflectsInternal) {
{
std::hash<int> int_hash;
std::hash<Optional<int>> opt_int_hash;
EXPECT_EQ(int_hash(1), opt_int_hash(Optional<int>(1)));
}
{
std::hash<std::string> str_hash;
std::hash<Optional<std::string>> opt_str_hash;
EXPECT_EQ(str_hash(std::string("foobar")),
opt_str_hash(Optional<std::string>(std::string("foobar"))));
}
}
TEST(OptionalTest, Hash_NullOptEqualsNullOpt) {
std::hash<Optional<int>> opt_int_hash;
std::hash<Optional<std::string>> opt_str_hash;
EXPECT_EQ(opt_str_hash(Optional<std::string>()),
opt_int_hash(Optional<int>()));
}
TEST(OptionalTest, Hash_UseInSet) {
std::set<Optional<int>> setOptInt;
EXPECT_EQ(setOptInt.end(), setOptInt.find(42));
setOptInt.insert(Optional<int>(3));
EXPECT_EQ(setOptInt.end(), setOptInt.find(42));
EXPECT_NE(setOptInt.end(), setOptInt.find(3));
}
TEST(OptionalTest, HasValue) {
Optional<int> a;
EXPECT_FALSE(a.has_value());
a = 42;
EXPECT_TRUE(a.has_value());
a = nullopt;
EXPECT_FALSE(a.has_value());
a = 0;
EXPECT_TRUE(a.has_value());
a = Optional<int>();
EXPECT_FALSE(a.has_value());
}
TEST(OptionalTest, Reset_int) {
Optional<int> a(0);
EXPECT_TRUE(a.has_value());
EXPECT_EQ(0, a.value());
a.reset();
EXPECT_FALSE(a.has_value());
EXPECT_EQ(-1, a.value_or(-1));
}
TEST(OptionalTest, Reset_Object) {
Optional<TestObject> a(TestObject(0, 0.1));
EXPECT_TRUE(a.has_value());
EXPECT_EQ(TestObject(0, 0.1), a.value());
a.reset();
EXPECT_FALSE(a.has_value());
EXPECT_EQ(TestObject(42, 0.0), a.value_or(TestObject(42, 0.0)));
}
TEST(OptionalTest, Reset_NoOp) {
Optional<int> a;
EXPECT_FALSE(a.has_value());
a.reset();
EXPECT_FALSE(a.has_value());
}
TEST(OptionalTest, AssignFromRValue) {
Optional<TestObject> a;
EXPECT_FALSE(a.has_value());
TestObject obj;
a = std::move(obj);
EXPECT_TRUE(a.has_value());
EXPECT_EQ(1, a->move_ctors_count());
}
TEST(OptionalTest, DontCallDefaultCtor) {
Optional<DeletedDefaultConstructor> a;
EXPECT_FALSE(a.has_value());
a = base::make_optional<DeletedDefaultConstructor>(42);
EXPECT_TRUE(a.has_value());
EXPECT_EQ(42, a->foo());
}
TEST(OptionalTest, DontCallNewMemberFunction) {
Optional<DeleteNewOperators> a;
EXPECT_FALSE(a.has_value());
a = DeleteNewOperators();
EXPECT_TRUE(a.has_value());
}
TEST(OptionalTest, Noexcept) {
// Trivial copy ctor, non-trivial move ctor, nothrow move assign.
struct Test1 {
Test1(const Test1&) = default;
Test1(Test1&&) {}
Test1& operator=(Test1&&) = default;
};
// Non-trivial copy ctor, trivial move ctor, throw move assign.
struct Test2 {
Test2(const Test2&) {}
Test2(Test2&&) = default;
Test2& operator=(Test2&&) { return *this; }
};
// Trivial copy ctor, non-trivial nothrow move ctor.
struct Test3 {
Test3(const Test3&) = default;
Test3(Test3&&) noexcept {}
};
// Non-trivial copy ctor, non-trivial nothrow move ctor.
struct Test4 {
Test4(const Test4&) {}
Test4(Test4&&) noexcept {}
};
// Non-trivial copy ctor, non-trivial move ctor.
struct Test5 {
Test5(const Test5&) {}
Test5(Test5&&) {}
};
static_assert(
noexcept(Optional<int>(std::declval<Optional<int>>())),
"move constructor for noexcept move-constructible T must be noexcept "
"(trivial copy, trivial move)");
static_assert(
!noexcept(Optional<Test1>(std::declval<Optional<Test1>>())),
"move constructor for non-noexcept move-constructible T must not be "
"noexcept (trivial copy)");
static_assert(
noexcept(Optional<Test2>(std::declval<Optional<Test2>>())),
"move constructor for noexcept move-constructible T must be noexcept "
"(non-trivial copy, trivial move)");
static_assert(
noexcept(Optional<Test3>(std::declval<Optional<Test3>>())),
"move constructor for noexcept move-constructible T must be noexcept "
"(trivial copy, non-trivial move)");
static_assert(
noexcept(Optional<Test4>(std::declval<Optional<Test4>>())),
"move constructor for noexcept move-constructible T must be noexcept "
"(non-trivial copy, non-trivial move)");
static_assert(
!noexcept(Optional<Test5>(std::declval<Optional<Test5>>())),
"move constructor for non-noexcept move-constructible T must not be "
"noexcept (non-trivial copy)");
static_assert(
noexcept(std::declval<Optional<int>>() = std::declval<Optional<int>>()),
"move assign for noexcept move-constructible/move-assignable T "
"must be noexcept");
static_assert(
!noexcept(std::declval<Optional<Test1>>() =
std::declval<Optional<Test1>>()),
"move assign for non-noexcept move-constructible T must not be noexcept");
static_assert(
!noexcept(std::declval<Optional<Test2>>() =
std::declval<Optional<Test2>>()),
"move assign for non-noexcept move-assignable T must not be noexcept");
}
} // namespace base