1 | /* |
2 | * Copyright 2016-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/futures/Future.h> |
18 | #include <folly/portability/GTest.h> |
19 | |
20 | using namespace folly; |
21 | |
22 | TEST(NonCopyableLambda, basic) { |
23 | Promise<int> promise; |
24 | Future<int> future = promise.getFuture(); |
25 | |
26 | Future<Unit>().thenValue(std::bind( |
27 | [](Promise<int>& p2, folly::Unit) mutable { p2.setValue(123); }, |
28 | std::move(promise), |
29 | std::placeholders::_1)); |
30 | |
31 | // The previous statement can be simplified in C++14: |
32 | // Future<Unit>().thenValue([promise = std::move(promise)](auto&&) mutable { |
33 | // promise.setValue(123); |
34 | // }); |
35 | |
36 | EXPECT_TRUE(future.isReady()); |
37 | EXPECT_EQ(std::move(future).get(), 123); |
38 | } |
39 | |
40 | TEST(NonCopyableLambda, unique_ptr) { |
41 | Promise<Unit> promise; |
42 | auto int_ptr = std::make_unique<int>(1); |
43 | |
44 | EXPECT_EQ(*int_ptr, 1); |
45 | |
46 | auto future = promise.getFuture().thenValue(std::bind( |
47 | [](std::unique_ptr<int>& p, folly::Unit) mutable { |
48 | ++*p; |
49 | return std::move(p); |
50 | }, |
51 | std::move(int_ptr), |
52 | std::placeholders::_1)); |
53 | |
54 | // The previous statement can be simplified in C++14: |
55 | // auto future = |
56 | // promise.getFuture().thenValue([int_ptr = std::move(int_ptr)]( |
57 | // auto&&) mutable { |
58 | // ++*int_ptr; |
59 | // return std::move(int_ptr); |
60 | // }); |
61 | |
62 | EXPECT_FALSE(future.isReady()); |
63 | promise.setValue(); |
64 | EXPECT_TRUE(future.isReady()); |
65 | EXPECT_EQ(*std::move(future).get(), 2); |
66 | } |
67 | |
68 | TEST(NonCopyableLambda, Function) { |
69 | Promise<int> promise; |
70 | |
71 | Function<int(int)> callback = [](int x) { return x + 1; }; |
72 | |
73 | auto future = promise.getFuture().thenValue(std::move(callback)); |
74 | EXPECT_THROW(callback(0), std::bad_function_call); |
75 | |
76 | EXPECT_FALSE(future.isReady()); |
77 | promise.setValue(100); |
78 | EXPECT_TRUE(future.isReady()); |
79 | EXPECT_EQ(std::move(future).get(), 101); |
80 | } |
81 | |
82 | TEST(NonCopyableLambda, FunctionConst) { |
83 | Promise<int> promise; |
84 | |
85 | Function<int(int) const> callback = [](int x) { return x + 1; }; |
86 | |
87 | auto future = promise.getFuture().thenValue(std::move(callback)); |
88 | EXPECT_THROW(callback(0), std::bad_function_call); |
89 | |
90 | EXPECT_FALSE(future.isReady()); |
91 | promise.setValue(100); |
92 | EXPECT_TRUE(future.isReady()); |
93 | EXPECT_EQ(std::move(future).get(), 101); |
94 | } |
95 | |