在c++中使用enable_shared_from_this时检查现有的shared_ptr？
除了捕获尝试在原始指针上调用shared_from_this()时抛出的bad_weak_ptr错误之外，是否有方法测试该对象是否正在被引用计数？
我有处理原始指针和共享指针的函数，并且我想确保在使用错误的指针时错误是明显的？我当然可以捕获错误，但我只是想知道是否有一种简单的方法来测试这种特殊情况？
Aside from catching the bad_weak_ptr error thrown when trying to call shared_from_this() on a pointer that is a raw pointer, is there a way of testing whether or not the object is being reference counted?
I have functions that deal with the raw pointer and shared pointer and I want to be sure that the error is obvious when using the wrong one? I can of course just catch the error, but I just wondered if there's an easy way of testing for this particular case?
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对于现有的有效对象或指向它的指针，对 std::enable_shared_from_this::shared_from_this() 的调用永远不会失败。编辑：...如果至少有一个
std::shared_ptr实例，其中YourClass是std::enable_shared_from_this>。这是比第一个更严格的声明，如果被误解，我深表歉意。您可以通过仅创建类的
shared_ptr实例来确保shared_from_this()的有效性。除了捕获异常之外，无法检查YourClass实例是否由shared_ptr管理。A call to
std::enable_shared_from_this<T>::shared_from_this()will never fail for an existing valid object, or pointer to it. EDIT: ... if there is at least one instance ofstd::shared_ptr<YourClass>whereYourClassisstd::enable_shared_from_this<YourClass>. This is a stricter statement than the first one and I apologize if it was misunderstood.You assure the validity of
shared_from_this()by creating onlyshared_ptrinstances of your classes. There is no way to check if aYourClassinstance is managed by ashared_ptr, except of catching the exception.不要混合原始指针和托管指针。
Don't mix raw pointers and managed pointers.