2 * Copyright 2017 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/Memory.h>
18 #include <folly/Arena.h>
19 #include <folly/String.h>
20 #include <folly/portability/GTest.h>
22 #include <glog/logging.h>
24 #include <type_traits>
27 using namespace folly;
29 TEST(make_unique, compatible_with_std_make_unique) {
30 // HACK: To enforce that `folly::` is imported here.
31 to_shared_ptr(std::unique_ptr<std::string>());
34 make_unique<string>("hello, world");
37 TEST(to_weak_ptr, example) {
38 auto s = std::make_shared<int>(17);
39 EXPECT_EQ(1, s.use_count());
40 EXPECT_EQ(2, (to_weak_ptr(s).lock(), s.use_count())) << "lvalue";
41 EXPECT_EQ(3, (to_weak_ptr(decltype(s)(s)).lock(), s.use_count())) << "rvalue";
44 TEST(allocate_sys_buffer, compiles) {
45 auto buf = allocate_sys_buffer(256);
46 // Freed at the end of the scope.
49 template <std::size_t> struct T {};
50 template <std::size_t> struct S {};
51 template <std::size_t> struct P {};
53 TEST(as_stl_allocator, sanity_check) {
54 typedef StlAllocator<SysArena, int> stl_arena_alloc;
56 EXPECT_TRUE((std::is_same<
57 as_stl_allocator<int, SysArena>::type,
61 EXPECT_TRUE((std::is_same<
62 as_stl_allocator<int, stl_arena_alloc>::type,
67 TEST(StlAllocator, void_allocator) {
68 typedef StlAllocator<SysArena, void> void_allocator;
70 void_allocator valloc(&arena);
72 typedef void_allocator::rebind<int>::other int_allocator;
73 int_allocator ialloc(valloc);
75 auto i = std::allocate_shared<int>(ialloc, 10);
76 ASSERT_NE(nullptr, i.get());
79 ASSERT_EQ(nullptr, i.get());
82 TEST(rebind_allocator, sanity_check) {
83 std::allocator<long> alloc;
85 auto i = std::allocate_shared<int>(
86 rebind_allocator<int, decltype(alloc)>(alloc), 10
88 ASSERT_NE(nullptr, i.get());
91 ASSERT_EQ(nullptr, i.get());
93 auto d = std::allocate_shared<double>(
94 rebind_allocator<double>(alloc), 5.6
96 ASSERT_NE(nullptr, d.get());
99 ASSERT_EQ(nullptr, d.get());
101 auto s = std::allocate_shared<std::string>(
102 rebind_allocator<std::string>(alloc), "HELLO, WORLD"
104 ASSERT_NE(nullptr, s.get());
105 EXPECT_EQ("HELLO, WORLD", *s);
107 ASSERT_EQ(nullptr, s.get());
110 template <typename C>
111 static void test_enable_shared_from_this(std::shared_ptr<C> sp) {
112 ASSERT_EQ(1l, sp.use_count());
114 // Test shared_from_this().
115 std::shared_ptr<C> sp2 = sp->shared_from_this();
118 // Test weak_from_this().
119 std::weak_ptr<C> wp = sp->weak_from_this();
120 ASSERT_EQ(sp, wp.lock());
123 ASSERT_EQ(nullptr, wp.lock());
125 // Test shared_from_this() and weak_from_this() on object not owned by a
126 // shared_ptr. Undefined in C++14 but well-defined in C++17. Also known to
127 // work with libstdc++ >= 20150123. Feel free to add other standard library
128 // versions where the behavior is known.
129 #if __cplusplus >= 201700L || \
130 __GLIBCXX__ >= 20150123L
132 ASSERT_THROW(stack_resident.shared_from_this(), std::bad_weak_ptr);
133 ASSERT_TRUE(stack_resident.weak_from_this().expired());
137 TEST(enable_shared_from_this, compatible_with_std_enable_shared_from_this) {
138 // Compile-time compatibility.
139 class C_std : public std::enable_shared_from_this<C_std> {};
140 class C_folly : public folly::enable_shared_from_this<C_folly> {};
142 noexcept(std::declval<C_std>().shared_from_this()) ==
143 noexcept(std::declval<C_folly>().shared_from_this()), "");
145 noexcept(std::declval<C_std const>().shared_from_this()) ==
146 noexcept(std::declval<C_folly const>().shared_from_this()), "");
147 static_assert(noexcept(std::declval<C_folly>().weak_from_this()), "");
148 static_assert(noexcept(std::declval<C_folly const>().weak_from_this()), "");
150 // Runtime compatibility.
151 test_enable_shared_from_this(std::make_shared<C_folly>());
152 test_enable_shared_from_this(std::make_shared<C_folly const>());