解释代码:std::shared_ptr<common::IpcReceiver> reader;
时间: 2023-11-09 14:56:45 浏览: 46
这行代码声明了一个名为reader的共享指针变量,它指向类型为common::IpcReceiver的对象。
std::shared_ptr是C++标准库中提供的智能指针类型,它可以自动管理动态分配的内存。在这种情况下,std::shared_ptr被用来管理common::IpcReceiver类型对象的内存。
在声明时,未指定初始值,因此reader的值为nullptr,表示它当前不指向任何对象。在后续的代码中,可以通过将其赋值为其他共享指针或通过调用std::make_shared来创建新的共享指针对象并将其赋值给reader来改变其指向的对象。
相关问题
std::atomic<std::shared_ptr<T>>
std::atomic is a C++ class template that provides atomic operations on its template parameter. In this case, the template parameter is std::shared_ptr<T>, which is a type of smart pointer that manages a reference-counted object.
The std::atomic<std::shared_ptr<T>> class template ensures that operations on the shared_ptr object are atomic, meaning that they are indivisible and cannot be interrupted by other threads. This prevents race conditions and ensures that the shared_ptr object is always in a consistent state.
The atomic operations provided by std::atomic<std::shared_ptr<T>> include load, store, and exchange. These operations allow multiple threads to access and modify the shared_ptr object without causing data races or other synchronization issues.
Overall, std::atomic<std::shared_ptr<T>> is a powerful tool for managing shared resources in a multithreaded environment, providing a safe and efficient way to share data between threads.
std::map<std::shared_ptr<EventBase>, std::shared_ptr<MESSAGE_MAP>> mEventBuilders;
这是一个使用`std::map`容器的数据成员`mEventBuilders`,它的键类型为`std::shared_ptr<EventBase>`,值类型为`std::shared_ptr<MESSAGE_MAP>`。这意味着`mEventBuilders`是一个将`std::shared_ptr<EventBase>`映射到`std::shared_ptr<MESSAGE_MAP>`的映射表。