2 * Copyright 2012 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/Optional.h"
25 #include <glog/logging.h>
26 #include <gtest/gtest.h>
27 #include <boost/optional.hpp>
29 using namespace folly;
30 using std::unique_ptr;
31 using std::shared_ptr;
34 NoDefault(int, int) {}
38 static_assert(sizeof(Optional<char>) == 2, "");
39 static_assert(sizeof(Optional<int>) == 8, "");
40 static_assert(sizeof(Optional<NoDefault>) == 4, "");
41 static_assert(sizeof(Optional<char>) == sizeof(boost::optional<char>), "");
42 static_assert(sizeof(Optional<short>) == sizeof(boost::optional<short>), "");
43 static_assert(sizeof(Optional<int>) == sizeof(boost::optional<int>), "");
44 static_assert(sizeof(Optional<double>) == sizeof(boost::optional<double>), "");
46 TEST(Optional, NoDefault) {
47 Optional<NoDefault> x;
55 TEST(Optional, String) {
56 Optional<std::string> maybeString;
57 EXPECT_FALSE(maybeString);
58 maybeString = "hello";
59 EXPECT_TRUE(maybeString);
62 TEST(Optional, Const) {
63 { // default construct
64 Optional<const int> opt;
75 Optional<const int> opt(x);
80 Optional<const int> opt(std::move(x));
83 // no assignment allowed
86 TEST(Optional, Simple) {
98 TEST(Optional, Unique) {
99 Optional<unique_ptr<int>> opt;
104 opt.emplace(new int(5));
110 opt = unique_ptr<int>(new int(6));
113 opt = unique_ptr<int>(new int(7));
116 // move it out by move construct
117 Optional<unique_ptr<int>> moved(std::move(opt));
120 EXPECT_EQ(7, **moved);
123 opt = std::move(moved); // move it back by move assign
129 TEST(Optional, Shared) {
131 Optional<shared_ptr<int>> opt;
134 opt.emplace(new int(5));
137 EXPECT_EQ(ptr.get(), opt->get());
138 EXPECT_EQ(2, ptr.use_count());
140 EXPECT_EQ(1, ptr.use_count());
143 EXPECT_EQ(2, ptr.use_count());
144 EXPECT_EQ(ptr.get(), opt->get());
146 EXPECT_EQ(1, ptr.use_count());
148 opt = std::move(ptr);
149 EXPECT_EQ(1, opt->use_count());
150 EXPECT_EQ(nullptr, ptr.get());
152 Optional<shared_ptr<int>> copied(opt);
153 EXPECT_EQ(2, opt->use_count());
154 Optional<shared_ptr<int>> moved(std::move(opt));
155 EXPECT_EQ(2, moved->use_count());
156 moved.emplace(new int(6));
157 EXPECT_EQ(1, moved->use_count());
159 EXPECT_EQ(2, moved->use_count());
163 TEST(Optional, Order) {
164 std::vector<Optional<int>> vect{
171 std::vector<Optional<int>> expected {
178 std::sort(vect.begin(), vect.end());
179 EXPECT_TRUE(vect == expected);
182 TEST(Optional, Swap) {
183 Optional<std::string> a;
184 Optional<std::string> b;
187 EXPECT_FALSE(a.hasValue());
188 EXPECT_FALSE(b.hasValue());
191 EXPECT_TRUE(a.hasValue());
192 EXPECT_FALSE(b.hasValue());
193 EXPECT_EQ("hello", a.value());
196 EXPECT_FALSE(a.hasValue());
197 EXPECT_TRUE(b.hasValue());
198 EXPECT_EQ("hello", b.value());
201 EXPECT_TRUE(a.hasValue());
202 EXPECT_EQ("bye", a.value());
207 TEST(Optional, Comparisons) {
213 EXPECT_TRUE(o_ <= 1);
214 EXPECT_TRUE(o_ <= o_);
215 EXPECT_TRUE(o_ == o_);
216 EXPECT_TRUE(o_ != 1);
217 EXPECT_TRUE(o_ >= o_);
218 EXPECT_TRUE(1 >= o_);
221 EXPECT_TRUE(o1 < o2);
222 EXPECT_TRUE(o1 <= o2);
223 EXPECT_TRUE(o1 <= o1);
224 EXPECT_TRUE(o1 == o1);
225 EXPECT_TRUE(o1 != o2);
226 EXPECT_TRUE(o1 >= o1);
227 EXPECT_TRUE(o2 >= o1);
228 EXPECT_TRUE(o2 > o1);
230 EXPECT_FALSE(o2 < o1);
231 EXPECT_FALSE(o2 <= o1);
232 EXPECT_FALSE(o2 <= o1);
233 EXPECT_FALSE(o2 == o1);
234 EXPECT_FALSE(o1 != o1);
235 EXPECT_FALSE(o1 >= o2);
236 EXPECT_FALSE(o1 >= o2);
237 EXPECT_FALSE(o1 > o2);
240 EXPECT_TRUE(1 <= o2);
241 EXPECT_TRUE(1 <= o1);
242 EXPECT_TRUE(1 == o1);
243 EXPECT_TRUE(2 != o1);
244 EXPECT_TRUE(1 >= o1);
245 EXPECT_TRUE(2 >= o1);
248 EXPECT_FALSE(o2 < 1);
249 EXPECT_FALSE(o2 <= 1);
250 EXPECT_FALSE(o2 <= 1);
251 EXPECT_FALSE(o2 == 1);
252 EXPECT_FALSE(o2 != 2);
253 EXPECT_FALSE(o1 >= 2);
254 EXPECT_FALSE(o1 >= 2);
255 EXPECT_FALSE(o1 > 2);
258 TEST(Optional, Pointee) {
260 EXPECT_FALSE(get_pointer(x));
262 EXPECT_TRUE(get_pointer(x));
266 EXPECT_FALSE(get_pointer(x));