Webb这个 weak_ptr 在第一次创建 shared_ptr 的时候会被初始化,指向 this。 似乎继承了 std::enable_shared_from_this 的类都被强制必须通过 shared_ptr 进行管理。 auto b = new Bar; auto sptr = b->shared_from_this (); 在我的环境下(gcc 7.5.0)上面的代码执行的时候会直接 coredump,而不是返回指向 nullptr 的 shared_ptr: terminate called after … Webb3 maj 2024 · The aliasing constructor: constructs a shared_ptr which shares ownership information with the initial value of r, but holds an unrelated and unmanaged pointer ptr. …
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Webb2 okt. 2024 · The bug is that you're using shared_from_this () on an object which has no shared_ptr pointing to it. This violates a precondition of shared_from_this (), namely that at least one shared_ptr must already have been created (and still exist) pointing to this. However, his advice seems completely beside the point and dangerous in Asio code. Webb18 okt. 2014 · what(): tr1::bad_weak_ptr Aborted 失败原因分析: 在主函数main中,D的实例是在栈上构造,没有使用boost::shared_ptr 的构造方式, 所 … io link workshop
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Webb21 nov. 2011 · The way the weak_ptr is initialized is in the shared_ptr constructor, by using a clever trick to statically determines if the object being wrapped inherits from enable_shared_from_this. The problem with this is that it assumes that there is only one weak_ptr to initialize. Webbför 2 dagar sedan · An amazing testimony on a spell caster who brought my wife back to me!! I'm happily married to a lovely and caring wife,with two kids, A very big problem occurred in my family seven months ago,between … Webb在 shared_from_this () 期间调用,程序崩溃并显示 bad_weak_ptr 异常 (exception)。 研究 根据我的研究,导致此错误的最常见原因是: 何时 shared_from_this () 在构造函数 (或由构造函数调用的函数)中调用 当不存在 std::shared_ptr 时指向对象。 在我的程序中: 调用构造函数和 get_available_connection () 是分开的,并且通过终端中的输出行,似乎 … ons world holidays