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This article mainly introduces "what is the working principle of shared_ptr of Cellular 11". In the daily operation, I believe that many people have doubts about the working principle of shared_ptr of Cellular 11. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the questions of "what is the working principle of shared_ptr of Craft 11"! Next, please follow the editor to study!

Basic principles

Shared_ptr maintains an internal mechanism equivalent to reference counting that allows multiple pointers to point to an object at the same time. After a pointer is destroyed, the reference count is low at the same time, and when all pointers are destroyed, the managed object is automatically released.

Preparatory work

To clearly see the process of getting and releasing objects, we write a simple MyString class.

Whenever an object of this class is created and destroyed, the Constructed and Destructed strings can be output accordingly.

Declare and initialize

Shared_ptr is a template class that must declare the type that points to the object when it is declared:

The above code only defines an empty shared_ptr. If you need to initialize it at the same time, the safest way is to use the make_shared standard library function:

The reason why this method is safe, I think, is that although make_shared also generates a MyString object, it is directly assembled to the shared_ptr and cannot be touched by the side.

Assignment

We can also assign the value of one shared_ptr to another shared_ptr:

Use shared_ptr

You can use shared_ptr like a normal pointer:

Full view of the code

Output result

New and delete are not used in the code, but you can still use shared_ptr like a pointer without worrying about memory leaks.

At this point, the study on "what is the working principle of shared_ptr in Cellular 11" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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