如何使用删除与由两个指针指向的变量？ [英] How to use delete with a variable pointed to by two pointers?

问题描述

假设我有一个以 new 声明的假设指针：

Let say I have a hypothetical pointer declared with new like so:

int* hypothetical_pointer = new int;

并创建另一个具有相同值的假设指针：

and create another hypothetical pointer, with the same value:

int* another_hypothetical_pointer = hypothetical_pointer;

如果我要删除这些，指针，还是只有一个明确声明为new？或者我可以删除任何一个指针吗？

If I were to go about deleting these, which were declared with new, would I have to delete both pointers, or only the one explicitly declared with new? Or could I delete either pointer?

推荐答案

delete 对象由指针指向。

当你 delete hypothetical_pointer时，就会有一个指针指向这个对象。 ; ，不能使用 hypothetical_pointer 或 another_hypothetical_pointer ，因为它们都不指向有效对象。

After you delete hypothetical_pointer;, you cannot use hypothetical_pointer or another_hypothetical_pointer because neither of them points to a valid object.

如果你需要有多个指针指向同一个对象，你应该使用共享所有权智能指针，例如 shared_ptr ，以确保对象不被过早地销毁，并且它被精确地销毁一次。 C ++中的手动资源管理充满危险，应该避免。

If you need to have multiple pointers pointing to the same object, you should use a shared-ownership smart pointer, like shared_ptr, to ensure that the object is not destroyed prematurely and that it is destroyed exactly once. Manual resource management in C++ is fraught with peril and should be avoided.

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