Fix to build SharedMutexTest on aarch64

[folly.git] / folly / test / MemoryTest.cpp

diff --git a/folly/test/MemoryTest.cpp b/folly/test/MemoryTest.cpp
index d7660476a085f2be7dbb0525c533b92c21bc6806..f3e6f8d383b4b8ae6af147df0df1256695366d8f 100644 (file)
--- a/folly/test/MemoryTest.cpp
+++ b/folly/test/MemoryTest.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,13 +15,15 @@
  */
 
 #include <folly/Memory.h>
-#include <folly/Arena.h>
-#include <folly/String.h>
-#include <folly/portability/GTest.h>
+
+#include <type_traits>
+#include <utility>
 
 #include <glog/logging.h>
 
-#include <type_traits>
+#include <folly/String.h>
+#include <folly/memory/Arena.h>
+#include <folly/portability/GTest.h>
 
 using namespace folly;
 
@@ -33,6 +35,13 @@ TEST(make_unique, compatible_with_std_make_unique) {
   make_unique<string>("hello, world");
 }
 
+TEST(to_weak_ptr, example) {
+  auto s = std::make_shared<int>(17);
+  EXPECT_EQ(1, s.use_count());
+  EXPECT_EQ(2, (to_weak_ptr(s).lock(), s.use_count())) << "lvalue";
+  EXPECT_EQ(3, (to_weak_ptr(decltype(s)(s)).lock(), s.use_count())) << "rvalue";
+}
+
 TEST(allocate_sys_buffer, compiles) {
   auto buf = allocate_sys_buffer(256);
   //  Freed at the end of the scope.
@@ -98,3 +107,48 @@ TEST(rebind_allocator, sanity_check) {
   s.reset();
   ASSERT_EQ(nullptr, s.get());
 }
+
+template <typename C>
+static void test_enable_shared_from_this(std::shared_ptr<C> sp) {
+  ASSERT_EQ(1l, sp.use_count());
+
+  // Test shared_from_this().
+  std::shared_ptr<C> sp2 = sp->shared_from_this();
+  ASSERT_EQ(sp, sp2);
+
+  // Test weak_from_this().
+  std::weak_ptr<C> wp = sp->weak_from_this();
+  ASSERT_EQ(sp, wp.lock());
+  sp.reset();
+  sp2.reset();
+  ASSERT_EQ(nullptr, wp.lock());
+
+  // Test shared_from_this() and weak_from_this() on object not owned by a
+  // shared_ptr. Undefined in C++14 but well-defined in C++17. Also known to
+  // work with libstdc++ >= 20150123. Feel free to add other standard library
+  // versions where the behavior is known.
+#if __cplusplus >= 201700L || \
+    __GLIBCXX__ >= 20150123L
+  C stack_resident;
+  ASSERT_THROW(stack_resident.shared_from_this(), std::bad_weak_ptr);
+  ASSERT_TRUE(stack_resident.weak_from_this().expired());
+#endif
+}
+
+TEST(enable_shared_from_this, compatible_with_std_enable_shared_from_this) {
+  // Compile-time compatibility.
+  class C_std : public std::enable_shared_from_this<C_std> {};
+  class C_folly : public folly::enable_shared_from_this<C_folly> {};
+  static_assert(
+    noexcept(std::declval<C_std>().shared_from_this()) ==
+    noexcept(std::declval<C_folly>().shared_from_this()), "");
+  static_assert(
+    noexcept(std::declval<C_std const>().shared_from_this()) ==
+    noexcept(std::declval<C_folly const>().shared_from_this()), "");
+  static_assert(noexcept(std::declval<C_folly>().weak_from_this()), "");
+  static_assert(noexcept(std::declval<C_folly const>().weak_from_this()), "");
+
+  // Runtime compatibility.
+  test_enable_shared_from_this(std::make_shared<C_folly>());
+  test_enable_shared_from_this(std::make_shared<C_folly const>());
+}