2 * Copyright 2016 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 <folly/futures/Future.h>
18 #include <folly/portability/GTest.h>
22 using namespace folly;
25 int v_, copied_, moved_;
26 /* implicit */ Widget(int v) : v_(v), copied_(0), moved_(0) {}
27 Widget(const Widget& other)
28 : v_(other.v_), copied_(other.copied_ + 1), moved_(other.moved_) {}
29 Widget(Widget&& other) noexcept
30 : v_(other.v_), copied_(other.copied_), moved_(other.moved_ + 1) {}
31 Widget& operator=(const Widget& /* other */) {
32 throw std::logic_error("unexpected copy assignment");
34 Widget& operator=(Widget&& /* other */) {
35 throw std::logic_error("unexpected move assignment");
39 TEST(Then, tryConstructor) {
40 auto t = Try<Widget>(23);
41 EXPECT_EQ(t.value().v_, 23);
42 EXPECT_EQ(t.value().copied_, 0);
43 EXPECT_EQ(t.value().moved_, 1);
46 TEST(Then, makeFuture) {
47 auto future = makeFuture<Widget>(23);
48 EXPECT_EQ(future.value().v_, 23);
49 EXPECT_EQ(future.value().copied_, 0);
50 EXPECT_EQ(future.value().moved_, 2);
53 TEST(Then, tryConstRValueReference) {
54 auto future = makeFuture<Widget>(23).then(
55 [](const Try<Widget>&& t) {
56 EXPECT_EQ(t.value().copied_, 0);
57 EXPECT_EQ(t.value().moved_, 2);
60 EXPECT_EQ(future.value(), 23);
63 TEST(Then, tryRValueReference) {
64 auto future = makeFuture<Widget>(23).then(
66 EXPECT_EQ(t.value().copied_, 0);
67 EXPECT_EQ(t.value().moved_, 2);
70 EXPECT_EQ(future.value(), 23);
73 TEST(Then, tryLValueReference) {
74 auto future = makeFuture<Widget>(23).then(
76 EXPECT_EQ(t.value().copied_, 0);
77 EXPECT_EQ(t.value().moved_, 2);
80 EXPECT_EQ(future.value(), 23);
83 TEST(Then, tryConstLValueReference) {
84 auto future = makeFuture<Widget>(23).then(
85 [](const Try<Widget>& t) {
86 EXPECT_EQ(t.value().copied_, 0);
87 EXPECT_EQ(t.value().moved_, 2);
90 EXPECT_EQ(future.value(), 23);
93 TEST(Then, tryValue) {
94 auto future = makeFuture<Widget>(23).then(
96 EXPECT_EQ(t.value().copied_, 0);
97 EXPECT_EQ(t.value().moved_, 3);
100 EXPECT_EQ(future.value(), 23);
103 TEST(Then, tryConstValue) {
104 auto future = makeFuture<Widget>(23).then(
105 [](const Try<Widget> t) {
106 EXPECT_EQ(t.value().copied_, 0);
107 EXPECT_EQ(t.value().moved_, 3);
110 EXPECT_EQ(future.value(), 23);
113 TEST(Then, constRValueReference) {
114 auto future = makeFuture<Widget>(23).then(
115 [](const Widget&& w) {
116 EXPECT_EQ(w.copied_, 0);
117 EXPECT_EQ(w.moved_, 2);
120 EXPECT_EQ(future.value(), 23);
123 TEST(Then, rValueReference) {
124 auto future = makeFuture<Widget>(23).then(
126 EXPECT_EQ(w.copied_, 0);
127 EXPECT_EQ(w.moved_, 2);
130 EXPECT_EQ(future.value(), 23);
133 TEST(Then, lValueReference) {
134 auto future = makeFuture<Widget>(23).then(
136 EXPECT_EQ(w.copied_, 0);
137 EXPECT_EQ(w.moved_, 2);
140 EXPECT_EQ(future.value(), 23);
143 TEST(Then, constLValueReference) {
144 auto future = makeFuture<Widget>(23).then(
145 [](const Widget& w) {
146 EXPECT_EQ(w.copied_, 0);
147 EXPECT_EQ(w.moved_, 2);
150 EXPECT_EQ(future.value(), 23);
154 auto future = makeFuture<Widget>(23).then(
156 EXPECT_EQ(w.copied_, 0);
157 EXPECT_EQ(w.moved_, 3);
160 EXPECT_EQ(future.value(), 23);
163 TEST(Then, constValue) {
164 auto future = makeFuture<Widget>(23).then(
166 EXPECT_EQ(w.copied_, 0);
167 EXPECT_EQ(w.moved_, 3);
170 EXPECT_EQ(future.value(), 23);
173 TEST(Then, voidThenShouldPropagateExceptions) {
174 EXPECT_FALSE(makeFuture(42).then().hasException());
175 EXPECT_TRUE(makeFuture<int>(std::runtime_error("err"))
176 .then().hasException());