weak_ptr指向shared_ptr的资源,但是并不拥有资源。 具体地。weak_ptr是一种弱引用的智能指针,它可以指向一个由shared_ptr管理的对象,但不会增加该对象的引用计数。当最后一个shared_ptr超出范围时,weak_ptr将自动失效。 当weak_ptr销毁时,并不会销毁资源。而且weak_ptr不会阻止shared_ptr释放资源。 weak_ptr的构...
标签: weak-ptr 有一个weak_ptr的向量,想要返回一个shared_ptr的向量 我目前正在开展一个大项目,我需要使用weak_ptr而不是shared_ptr.这是我的问题.我有一个名为House的类,其属性为:vector<boost::shared_ptr<People>> my_people.我想修改这个数据成员vector<boost::weak_ptr<People>> my_people....
unique_ptr weak_ptr auto_ptr(被 C++11 弃用)Class shared_ptr 实现共享式拥有(shared ownership)概念。多个智能指针指向相同对象,该对象和其相关资源会在 “最后一个 reference 被销毁” 时被释放。为了在结构较复杂的情景中执行上述工作,标准库提供 weak_ptr、bad_weak_ptr 和 enable_shared_from_this 等辅助...
libc++abi.dylib:以未捕获的 std::__1::bad_weak_ptr 类型异常终止:bad_weak_ptr template <typename M> 21 class Http: public std::enable_shared_from_this<Http<M>> 22 { 23 M* message_; 24 bool isSubscribe_; 25 boost::asio::io_context io_; 26 boost::asio::ip::tcp::resolver resol...
In file included from vendor/boost/shared_ptr.hpp:17: In file included from vendor/boost/smart_ptr/shared_ptr.hpp:17: In file included from vendor/boost/smart_ptr/detail/shared_count.hpp:25: In file included from vendor/boost/smart_ptr/bad_weak_ptr.hpp:20: In file included from vendor...
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Create associated pointer (PTR) record:请勾选该选项,以确保DNS可以生成正向和反向的解析记录。 配置完成后,可以在客户端通过nslookup CLIENT_112_70命令检查配置是否生效。 客户端开启NFS安全认证开关。 CLIENT_112_70:~ # systemctl enable nfs-client.target CLIENT_112_70:~ # systemctl start nfs-client....
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R.24: 使用std::weak_ptr打破share_ptrs造成的循环 Reason(原因) shared_ptr's rely on use counting and the use count for a cyclic structure never goes to zero, so we need a mechanism to be able to destroy a cyclic structure. shared_ptr依靠使用计数动作,而循环构造(例如相互持有shared_ptr,译...
where l is one of any, basic, weak, layout, strict, std, or strong. See TABLE A-7 for a detailed explanation of the different levels of disambiguation. If you do not specify -Xalias_level, the default of the flag is -Xalias_level=any. This means that there is no type-based ...