1/*
2 * Copyright 2017-present Facebook, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <folly/executors/Async.h>
18#include <folly/executors/ManualExecutor.h>
19#include <folly/portability/GTest.h>
20
21#include <memory>
22
23using namespace folly;
24
25TEST(AsyncFunc, manual_executor) {
26 auto x = std::make_shared<ManualExecutor>();
27 auto oldX = getCPUExecutor();
28 setCPUExecutor(x);
29 auto f = async([] { return 42; });
30 EXPECT_FALSE(f.isReady());
31 x->run();
32 EXPECT_EQ(42, f.value());
33 setCPUExecutor(oldX);
34}
35
36TEST(AsyncFunc, value_lambda) {
37 auto lambda = [] { return 42; };
38 auto future = async(lambda);
39 EXPECT_EQ(42, std::move(future).get());
40}
41
42TEST(AsyncFunc, void_lambda) {
43 auto lambda = [] { /*do something*/ return; };
44 auto future = async(lambda);
45 // Futures with a void returning function, return Unit type
46 EXPECT_EQ(typeid(Unit), typeid(std::move(future).get()));
47}
48
49TEST(AsyncFunc, moveonly_lambda) {
50 auto lambda = [] { return std::make_unique<int>(42); };
51 auto future = async(lambda);
52 EXPECT_EQ(42, *std::move(future).get());
53}
54