2 * Copyright 2015 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include <gtest/gtest.h>
19 #include <folly/futures/Future.h>
23 using namespace folly;
26 int v_, copied_, moved_;
27 /* implicit */ Widget(int v) : v_(v), copied_(0), moved_(0) {}
28 Widget(const Widget& other)
29 : v_(other.v_), copied_(other.copied_ + 1), moved_(other.moved_) {}
30 Widget(Widget&& other) noexcept
31 : v_(other.v_), copied_(other.copied_), moved_(other.moved_ + 1) {}
32 Widget& operator=(const Widget& other)
33 { throw std::logic_error("unexpected copy assignment"); }
34 Widget& operator=(Widget&& other)
35 { throw std::logic_error("unexpected move assignment"); }
38 TEST(Then, tryConstructor) {
39 auto t = Try<Widget>(23);
40 EXPECT_EQ(t.value().v_, 23);
41 EXPECT_EQ(t.value().copied_, 0);
42 EXPECT_EQ(t.value().moved_, 1);
45 TEST(Then, makeFuture) {
46 auto future = makeFuture<Widget>(23);
47 EXPECT_EQ(future.value().v_, 23);
48 EXPECT_EQ(future.value().copied_, 0);
49 EXPECT_EQ(future.value().moved_, 2);
52 TEST(Then, tryConstRValueReference) {
53 auto future = makeFuture<Widget>(23).then(
54 [](const Try<Widget>&& t) {
55 EXPECT_EQ(t.value().copied_, 0);
56 EXPECT_EQ(t.value().moved_, 2);
59 EXPECT_EQ(future.value(), 23);
62 TEST(Then, tryRValueReference) {
63 auto future = makeFuture<Widget>(23).then(
65 EXPECT_EQ(t.value().copied_, 0);
66 EXPECT_EQ(t.value().moved_, 2);
69 EXPECT_EQ(future.value(), 23);
72 TEST(Then, tryLValueReference) {
73 auto future = makeFuture<Widget>(23).then(
75 EXPECT_EQ(t.value().copied_, 0);
76 EXPECT_EQ(t.value().moved_, 2);
79 EXPECT_EQ(future.value(), 23);
82 TEST(Then, tryConstLValueReference) {
83 auto future = makeFuture<Widget>(23).then(
84 [](const Try<Widget>& t) {
85 EXPECT_EQ(t.value().copied_, 0);
86 EXPECT_EQ(t.value().moved_, 2);
89 EXPECT_EQ(future.value(), 23);
92 TEST(Then, tryValue) {
93 auto future = makeFuture<Widget>(23).then(
95 EXPECT_EQ(t.value().copied_, 0);
96 EXPECT_EQ(t.value().moved_, 3);
99 EXPECT_EQ(future.value(), 23);
102 TEST(Then, tryConstValue) {
103 auto future = makeFuture<Widget>(23).then(
104 [](const Try<Widget> t) {
105 EXPECT_EQ(t.value().copied_, 0);
106 EXPECT_EQ(t.value().moved_, 3);
109 EXPECT_EQ(future.value(), 23);
112 TEST(Then, constRValueReference) {
113 auto future = makeFuture<Widget>(23).then(
114 [](const Widget&& w) {
115 EXPECT_EQ(w.copied_, 0);
116 EXPECT_EQ(w.moved_, 2);
119 EXPECT_EQ(future.value(), 23);
122 TEST(Then, rValueReference) {
123 auto future = makeFuture<Widget>(23).then(
125 EXPECT_EQ(w.copied_, 0);
126 EXPECT_EQ(w.moved_, 2);
129 EXPECT_EQ(future.value(), 23);
132 TEST(Then, lValueReference) {
133 auto future = makeFuture<Widget>(23).then(
135 EXPECT_EQ(w.copied_, 0);
136 EXPECT_EQ(w.moved_, 2);
139 EXPECT_EQ(future.value(), 23);
142 TEST(Then, constLValueReference) {
143 auto future = makeFuture<Widget>(23).then(
144 [](const Widget& w) {
145 EXPECT_EQ(w.copied_, 0);
146 EXPECT_EQ(w.moved_, 2);
149 EXPECT_EQ(future.value(), 23);
153 auto future = makeFuture<Widget>(23).then(
155 EXPECT_EQ(w.copied_, 0);
156 EXPECT_EQ(w.moved_, 3);
159 EXPECT_EQ(future.value(), 23);
162 TEST(Then, constValue) {
163 auto future = makeFuture<Widget>(23).then(
165 EXPECT_EQ(w.copied_, 0);
166 EXPECT_EQ(w.moved_, 3);
169 EXPECT_EQ(future.value(), 23);
172 TEST(Future, voidThenShouldPropagateExceptions) {
173 EXPECT_FALSE(makeFuture(42).then().hasException());
174 EXPECT_TRUE(makeFuture<int>(std::runtime_error("err"))
175 .then().hasException());