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 <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");
35 Widget& operator=(Widget&& /* other */) {
36 throw std::logic_error("unexpected move assignment");
40 TEST(Then, tryConstructor) {
41 auto t = Try<Widget>(23);
42 EXPECT_EQ(t.value().v_, 23);
43 EXPECT_EQ(t.value().copied_, 0);
44 EXPECT_EQ(t.value().moved_, 1);
47 TEST(Then, makeFuture) {
48 auto future = makeFuture<Widget>(23);
49 EXPECT_EQ(future.value().v_, 23);
50 EXPECT_EQ(future.value().copied_, 0);
51 EXPECT_EQ(future.value().moved_, 2);
54 TEST(Then, tryConstRValueReference) {
55 auto future = makeFuture<Widget>(23).then(
56 [](const Try<Widget>&& t) {
57 EXPECT_EQ(t.value().copied_, 0);
58 EXPECT_EQ(t.value().moved_, 2);
61 EXPECT_EQ(future.value(), 23);
64 TEST(Then, tryRValueReference) {
65 auto future = makeFuture<Widget>(23).then(
67 EXPECT_EQ(t.value().copied_, 0);
68 EXPECT_EQ(t.value().moved_, 2);
71 EXPECT_EQ(future.value(), 23);
74 TEST(Then, tryLValueReference) {
75 auto future = makeFuture<Widget>(23).then(
77 EXPECT_EQ(t.value().copied_, 0);
78 EXPECT_EQ(t.value().moved_, 2);
81 EXPECT_EQ(future.value(), 23);
84 TEST(Then, tryConstLValueReference) {
85 auto future = makeFuture<Widget>(23).then(
86 [](const Try<Widget>& t) {
87 EXPECT_EQ(t.value().copied_, 0);
88 EXPECT_EQ(t.value().moved_, 2);
91 EXPECT_EQ(future.value(), 23);
94 TEST(Then, tryValue) {
95 auto future = makeFuture<Widget>(23).then(
97 EXPECT_EQ(t.value().copied_, 0);
98 EXPECT_EQ(t.value().moved_, 3);
101 EXPECT_EQ(future.value(), 23);
104 TEST(Then, tryConstValue) {
105 auto future = makeFuture<Widget>(23).then(
106 [](const Try<Widget> t) {
107 EXPECT_EQ(t.value().copied_, 0);
108 EXPECT_EQ(t.value().moved_, 3);
111 EXPECT_EQ(future.value(), 23);
114 TEST(Then, constRValueReference) {
115 auto future = makeFuture<Widget>(23).then(
116 [](const Widget&& w) {
117 EXPECT_EQ(w.copied_, 0);
118 EXPECT_EQ(w.moved_, 2);
121 EXPECT_EQ(future.value(), 23);
124 TEST(Then, rValueReference) {
125 auto future = makeFuture<Widget>(23).then(
127 EXPECT_EQ(w.copied_, 0);
128 EXPECT_EQ(w.moved_, 2);
131 EXPECT_EQ(future.value(), 23);
134 TEST(Then, lValueReference) {
135 auto future = makeFuture<Widget>(23).then(
137 EXPECT_EQ(w.copied_, 0);
138 EXPECT_EQ(w.moved_, 2);
141 EXPECT_EQ(future.value(), 23);
144 TEST(Then, constLValueReference) {
145 auto future = makeFuture<Widget>(23).then(
146 [](const Widget& w) {
147 EXPECT_EQ(w.copied_, 0);
148 EXPECT_EQ(w.moved_, 2);
151 EXPECT_EQ(future.value(), 23);
155 auto future = makeFuture<Widget>(23).then(
157 EXPECT_EQ(w.copied_, 0);
158 EXPECT_EQ(w.moved_, 3);
161 EXPECT_EQ(future.value(), 23);
164 TEST(Then, constValue) {
165 auto future = makeFuture<Widget>(23).then(
167 EXPECT_EQ(w.copied_, 0);
168 EXPECT_EQ(w.moved_, 3);
171 EXPECT_EQ(future.value(), 23);
174 TEST(Then, voidThenShouldPropagateExceptions) {
175 EXPECT_FALSE(makeFuture(42).then().hasException());
176 EXPECT_TRUE(makeFuture<int>(std::runtime_error("err"))
177 .then().hasException());