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- /*
- * Copyright 2017-present Facebook, Inc.
- *
- * 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 <folly/Optional.h>
- #include <folly/Portability.h>
- #include <folly/ScopeGuard.h>
- #include <folly/portability/GTest.h>
- #if FOLLY_HAS_COROUTINES
- using folly::Optional;
- Optional<int> f1() {
- return 7;
- }
- Optional<double> f2(int x) {
- return 2.0 * x;
- }
- // move-only type
- Optional<std::unique_ptr<int>> f3(int x, double y) {
- return std::make_unique<int>((int)(x + y));
- }
- TEST(Optional, CoroutineSuccess) {
- auto r0 = []() -> Optional<int> {
- auto x = co_await f1();
- EXPECT_EQ(7, x);
- auto y = co_await f2(x);
- EXPECT_EQ(2.0 * 7, y);
- auto z = co_await f3(x, y);
- EXPECT_EQ((int)(2.0 * 7 + 7), *z);
- co_return* z;
- }();
- EXPECT_TRUE(r0.hasValue());
- EXPECT_EQ(21, *r0);
- }
- Optional<int> f4(int, double) {
- return folly::none;
- }
- TEST(Optional, CoroutineFailure) {
- auto r1 = []() -> Optional<int> {
- auto x = co_await f1();
- auto y = co_await f2(x);
- auto z = co_await f4(x, y);
- ADD_FAILURE();
- co_return z;
- }();
- EXPECT_TRUE(!r1.hasValue());
- }
- Optional<int> throws() {
- throw 42;
- }
- TEST(Optional, CoroutineException) {
- try {
- auto r2 = []() -> Optional<int> {
- auto x = co_await throws();
- ADD_FAILURE();
- co_return x;
- }();
- (void)r2;
- ADD_FAILURE();
- } catch (/* nolint */ int i) {
- EXPECT_EQ(42, i);
- } catch (...) {
- ADD_FAILURE();
- }
- }
- // this test makes sure that the coroutine is destroyed properly
- TEST(Optional, CoroutineCleanedUp) {
- int count_dest = 0;
- auto r = [&]() -> Optional<int> {
- SCOPE_EXIT {
- ++count_dest;
- };
- auto x = co_await folly::Optional<int>();
- ADD_FAILURE() << "Should not be resuming";
- co_return x;
- }();
- EXPECT_FALSE(r.hasValue());
- EXPECT_EQ(1, count_dest);
- }
- #endif
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