How to use the smart pointer weak_ptr of Central11

The main content of this article is to explain how to use the smart pointer weak_ptr of Clear11. Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use the smart pointer weak_ptr of Central11.

Weak pointer

Weak_ptr looks more like an adjunct to shared_ptr, derived from shared_ptr, but does not control the lifecycle of the object it points to. This is where the weakness of weak_ptr lies.

Construction

There are three forms, all very simple, looking directly at the code.

Execution result:

Although two weak_ptr are constructed from shared_ptr, the reference count is still 1.

Assignment

It's just as simple.

Output result:

Although two weak_ptr are assigned according to shared_pt, the reference count is still 1.

Use

Instead of providing direct access to the object through weak_ptr, the standard library called the lock method of weak_ptr to generate a shared_ptr, and then access the object through shared_ptr.

Output result:

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