google-cloud-cpp/google/cloud/optional_test.cc at master · corn2/google-cloud-cpp · GitHub

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// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include "google/cloud/optional.h"

#include "google/cloud/testing_util/testing_types.h"

#include <gmock/gmock.h>

namespace google {

namespace cloud {

inline namespace GOOGLE_CLOUD_CPP_NS {

/// Helper types to test `google::cloud::optional<T>`

namespace {

using testing_util::Observable;

using OptionalObservable = optional<Observable>;

TEST(OptionalTest, Simple) {

optional<int> actual;

EXPECT_FALSE(actual.has_value());

EXPECT_FALSE(static_cast<bool>(actual));

EXPECT_EQ(42, actual.value_or(42));

#if GOOGLE_CLOUD_CPP_HAVE_EXCEPTIONS

EXPECT_THROW(actual.value(), std::exception);

#else

EXPECT_DEATH_IF_SUPPORTED(actual.value(), "exceptions are disabled");

#endif // GOOGLE_CLOUD_CPP_HAVE_EXCEPTIONS

actual.emplace(24);

EXPECT_TRUE(actual.has_value());

EXPECT_TRUE(static_cast<bool>(actual));

EXPECT_EQ(24, actual.value_or(42));

EXPECT_EQ(24, actual.value());

}

TEST(OptionalTest, NoDefaultConstruction) {

Observable::reset_counters();

OptionalObservable other;

EXPECT_EQ(0, Observable::default_constructor());

EXPECT_FALSE(other.has_value());

}

TEST(OptionalTest, Copy) {

Observable::reset_counters();

OptionalObservable other(Observable("foo"));

EXPECT_EQ("foo", other.value().str());

EXPECT_EQ(1, Observable::move_constructor());

Observable::reset_counters();

OptionalObservable copy(other);

EXPECT_EQ(1, Observable::copy_constructor());

EXPECT_TRUE(copy.has_value());

EXPECT_TRUE(other.has_value());

EXPECT_EQ("foo", copy->str());

}

TEST(OptionalTest, MoveCopy) {

Observable::reset_counters();

OptionalObservable other(Observable("foo"));

EXPECT_EQ("foo", other.value().str());

EXPECT_EQ(1, Observable::move_constructor());

Observable::reset_counters();

OptionalObservable copy(std::move(other));

EXPECT_EQ(1, Observable::move_constructor());

EXPECT_TRUE(copy.has_value());

EXPECT_EQ("foo", copy->str());

// The spec requires moved-from optionals to have a value, but the value

// is whatever is left after moving out from the 'T' parameter:

EXPECT_TRUE(other.has_value()); // NOLINT(bugprone-use-after-move)

EXPECT_EQ("moved-out", other->str());

}

TEST(OptionalTest, MoveAssignmentNoValueNoValue) {

OptionalObservable other;

OptionalObservable assigned;

EXPECT_FALSE(other.has_value());

EXPECT_FALSE(assigned.has_value());

Observable::reset_counters();

assigned = std::move(other);

EXPECT_FALSE(other.has_value()); // NOLINT(bugprone-use-after-move)

EXPECT_FALSE(assigned.has_value());

EXPECT_EQ(0, Observable::destructor());

EXPECT_EQ(0, Observable::move_assignment());

EXPECT_EQ(0, Observable::copy_assignment());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(0, Observable::copy_constructor());

}

TEST(OptionalTest, MoveAssignmentNoValueValue) {

OptionalObservable other(Observable("foo"));

OptionalObservable assigned;

EXPECT_TRUE(other.has_value());

EXPECT_FALSE(assigned.has_value());

Observable::reset_counters();

assigned = std::move(other);

EXPECT_TRUE(other.has_value()); // NOLINT(bugprone-use-after-move)

EXPECT_TRUE(assigned.has_value());

EXPECT_EQ("foo", assigned->str());

EXPECT_EQ("moved-out", other->str());

EXPECT_EQ(0, Observable::destructor());

EXPECT_EQ(0, Observable::move_assignment());

EXPECT_EQ(0, Observable::copy_assignment());

EXPECT_EQ(1, Observable::move_constructor());

EXPECT_EQ(0, Observable::copy_constructor());

}

TEST(OptionalTest, MoveAssignmentNoValueT) {

Observable other("foo");

OptionalObservable assigned;

EXPECT_FALSE(assigned.has_value());

Observable::reset_counters();

assigned = std::move(other);

EXPECT_TRUE(assigned.has_value());

EXPECT_EQ("foo", assigned->str());

EXPECT_EQ("moved-out", other.str()); // NOLINT(bugprone-use-after-move)

EXPECT_EQ(0, Observable::destructor());

EXPECT_EQ(0, Observable::move_assignment());

EXPECT_EQ(0, Observable::copy_assignment());

EXPECT_EQ(1, Observable::move_constructor());

EXPECT_EQ(0, Observable::copy_constructor());

}

TEST(OptionalTest, MoveAssignmentValueNoValue) {

OptionalObservable other;

OptionalObservable assigned(Observable("bar"));

EXPECT_FALSE(other.has_value());

EXPECT_TRUE(assigned.has_value());

Observable::reset_counters();

assigned = std::move(other);

EXPECT_FALSE(other.has_value()); // NOLINT(bugprone-use-after-move)

EXPECT_FALSE(assigned.has_value());

EXPECT_EQ(1, Observable::destructor());

EXPECT_EQ(0, Observable::move_assignment());

EXPECT_EQ(0, Observable::copy_assignment());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(0, Observable::copy_constructor());

}

TEST(OptionalTest, MoveAssignmentValueValue) {

OptionalObservable other(Observable("foo"));

OptionalObservable assigned(Observable("bar"));

EXPECT_TRUE(other.has_value());

EXPECT_TRUE(assigned.has_value());

Observable::reset_counters();

assigned = std::move(other);

EXPECT_TRUE(other.has_value()); // NOLINT(bugprone-use-after-move)

EXPECT_TRUE(assigned.has_value());

EXPECT_EQ(0, Observable::destructor());

EXPECT_EQ(1, Observable::move_assignment());

EXPECT_EQ(0, Observable::copy_assignment());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(0, Observable::copy_constructor());

EXPECT_EQ("foo", assigned->str());

EXPECT_EQ("moved-out", other->str());

}

TEST(OptionalTest, MoveAssignmentValueT) {

Observable other("foo");

OptionalObservable assigned(Observable("bar"));

EXPECT_TRUE(assigned.has_value());

Observable::reset_counters();

assigned = std::move(other);

EXPECT_TRUE(assigned.has_value());

EXPECT_EQ(0, Observable::destructor());

EXPECT_EQ(1, Observable::move_assignment());

EXPECT_EQ(0, Observable::copy_assignment());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(0, Observable::copy_constructor());

EXPECT_EQ("foo", assigned->str());

EXPECT_EQ("moved-out", other.str()); // NOLINT(bugprone-use-after-move)

}

TEST(OptionalTest, CopyAssignLvalue) {

Observable::reset_counters();

Observable original("foo");

OptionalObservable other(original);

EXPECT_EQ("foo", original.str());

EXPECT_EQ("foo", other->str());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(1, Observable::copy_constructor());

}

TEST(OptionalTest, CopyAssignmentNoValueNoValue) {

OptionalObservable other;

OptionalObservable assigned;

EXPECT_FALSE(other.has_value());

EXPECT_FALSE(assigned.has_value());

Observable::reset_counters();

assigned = other;

EXPECT_FALSE(other.has_value());

EXPECT_FALSE(assigned.has_value());

EXPECT_EQ(0, Observable::destructor());

EXPECT_EQ(0, Observable::move_assignment());

EXPECT_EQ(0, Observable::copy_assignment());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(0, Observable::copy_constructor());

}

TEST(OptionalTest, CopyAssignmentNoValueValue) {

OptionalObservable other(Observable("foo"));

OptionalObservable assigned;

EXPECT_TRUE(other.has_value());

EXPECT_FALSE(assigned.has_value());

Observable::reset_counters();

assigned = other;

EXPECT_TRUE(other.has_value());

EXPECT_TRUE(assigned.has_value());

EXPECT_EQ("foo", assigned->str());

EXPECT_EQ("foo", other->str());

EXPECT_EQ(0, Observable::destructor());

EXPECT_EQ(0, Observable::move_assignment());

EXPECT_EQ(0, Observable::copy_assignment());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(1, Observable::copy_constructor());

}

TEST(OptionalTest, CopyAssignmentNoValueT) {

Observable other("foo");

OptionalObservable assigned;

EXPECT_FALSE(assigned.has_value());

Observable::reset_counters();

assigned = other;

EXPECT_TRUE(assigned.has_value());

EXPECT_EQ("foo", assigned->str());

EXPECT_EQ("foo", other.str());

EXPECT_EQ(0, Observable::destructor());

EXPECT_EQ(0, Observable::move_assignment());

EXPECT_EQ(0, Observable::copy_assignment());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(1, Observable::copy_constructor());

}

TEST(OptionalTest, CopyAssignmentValueNoValue) {

OptionalObservable other;

OptionalObservable assigned(Observable("bar"));

EXPECT_FALSE(other.has_value());

EXPECT_TRUE(assigned.has_value());

Observable::reset_counters();

assigned = other;

EXPECT_FALSE(other.has_value());

EXPECT_FALSE(assigned.has_value());

EXPECT_EQ(1, Observable::destructor());

EXPECT_EQ(0, Observable::move_assignment());

EXPECT_EQ(0, Observable::copy_assignment());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(0, Observable::copy_constructor());

}

TEST(OptionalTest, CopyAssignmentValueValue) {

OptionalObservable other(Observable("foo"));

OptionalObservable assigned(Observable("bar"));

EXPECT_TRUE(other.has_value());

EXPECT_TRUE(assigned.has_value());

Observable::reset_counters();

assigned = other;

EXPECT_TRUE(other.has_value());

EXPECT_TRUE(assigned.has_value());

EXPECT_EQ(0, Observable::destructor());

EXPECT_EQ(0, Observable::move_assignment());

EXPECT_EQ(1, Observable::copy_assignment());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(0, Observable::copy_constructor());

EXPECT_EQ("foo", assigned->str());

EXPECT_EQ("foo", other->str());

}

TEST(OptionalTest, CopyAssignmentValueT) {

Observable other("foo");

OptionalObservable assigned(Observable("bar"));

EXPECT_TRUE(assigned.has_value());

Observable::reset_counters();

assigned = other;

EXPECT_TRUE(assigned.has_value());

EXPECT_EQ(0, Observable::destructor());

EXPECT_EQ(0, Observable::move_assignment());

EXPECT_EQ(1, Observable::copy_assignment());

EXPECT_EQ(0, Observable::move_constructor());

EXPECT_EQ(0, Observable::copy_constructor());

EXPECT_EQ("foo", assigned->str());

EXPECT_EQ("foo", other.str());

}

TEST(OptionalTest, MoveValue) {

OptionalObservable other(Observable("foo"));

EXPECT_EQ("foo", other.value().str());

Observable::reset_counters();

auto observed = std::move(other).value();

EXPECT_EQ("foo", observed.str());

// The optional should still have a value, but its value should have been

// moved out.

EXPECT_TRUE(other.has_value()); // NOLINT(bugprone-use-after-move)

EXPECT_EQ("moved-out", other->str());

}

TEST(OptionalTest, MoveValueOr) {

OptionalObservable other(Observable("foo"));

EXPECT_EQ("foo", other.value().str());

auto observed = std::move(other).value_or(Observable("bar"));

EXPECT_EQ("foo", observed.str());

// The optional should still have a value, but its value should have been

// moved out.

EXPECT_TRUE(other.has_value()); // NOLINT(bugprone-use-after-move)

EXPECT_EQ("moved-out", other->str());

}

TEST(OptionalTest, WithNoDefaultConstructor) {

using TestedOptional = optional<testing_util::NoDefaultConstructor>;

TestedOptional empty;

EXPECT_FALSE(empty.has_value());

TestedOptional actual(testing_util::NoDefaultConstructor(std::string("foo")));

EXPECT_TRUE(actual.has_value());

EXPECT_EQ(actual->str(), "foo");

}

struct ExplicitlyConvertible {

explicit operator std::string() const { return "explicit-conversion"; }

};

struct ImplicitlyConvertible {

// NOLINTNEXTLINE(google-explicit-constructor)

operator std::string() const { return "implicit-conversion"; }

};

TEST(OptionalTest, ValueConstructorWithImplicitConversion) {

optional<double> d = 123;

EXPECT_NEAR(*d, 123.0, 0.01);

optional<std::string> x = "hi";

EXPECT_EQ(*x, "hi");

optional<std::string> implicit_conversion = ImplicitlyConvertible{};

EXPECT_EQ(*implicit_conversion, "implicit-conversion");

// We may want to make a full no-compile test for the following case, but

// those are kinda a PITA.

optional<std::string> explicit_conversion(ExplicitlyConvertible{});

EXPECT_EQ(*explicit_conversion, "explicit-conversion");

}

TEST(OptionalTest, ValueAssignmentWithImplicitConversion) {

optional<std::string> x;

x = "hi";

EXPECT_EQ(*x, "hi");

}

optional<std::string> FunctionReturningOptStringValue() {

return "it-worked"; // If this compiles, it works.

}

TEST(OptionalTest, OptionalReturnWithValue) {

optional<std::string> x = FunctionReturningOptStringValue();

EXPECT_EQ(*x, "it-worked");

}

optional<std::string> FunctionReturningOptWithoutValue() {

return {}; // If this compiles, it works.

}

TEST(OptionalTest, OptionalReturnWithoutValue) {

optional<std::string> x = FunctionReturningOptWithoutValue();

EXPECT_FALSE(x);

EXPECT_FALSE(x.has_value());

}

TEST(OptionalTest, OptionalBoolCopy) {

// This test previously broke on gcc 4.8 because optional's converting

// constructor was being chosen instead of its copy constructor.

optional<bool> opt_b(false);

// NOLINTNEXTLINE(performance-unnecessary-copy-initialization)

optional<bool> copy(opt_b);

EXPECT_EQ(copy, opt_b);

}

} // namespace

} // namespace GOOGLE_CLOUD_CPP_NS

} // namespace cloud

} // namespace google

google-cloud-cpp/google/cloud/optional_test.cc at master · corn2/google-cloud-cpp · GitHub

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