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This article introduces the knowledge of "how C++ uses nullptr to show null pointers". In the operation of practical cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Instead of ES.47: use nullptr to represent null pointers instead of 0 or NULL

Reason (reason)

Readability. Minimize accident. Nullptr is not confused with integers. At the same time, nullptr has well-defined (very strict) types, and in many cases using NULL or 0 will lead to type inference errors, but using nullptr will not.

Example (sample)

Consider:

Consider the following code:

Void f (int)

Void f (char*)

F (0); / / call f (int)

F (nullptr); / / call f (char*) Enforcement (implementation recommendation)

Flag uses of 0 and NULL for pointers. The transformation may be helped by simple program transformation.

The tag uses 0 or NULL to represent the pointer. This transformation can or can be done through a simple program.

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