Shulou(Shulou.com)06/01 Report--

This article mainly explains "Why do not return pointers or references to local objects in C++". The explanation in this article is simple and clear and easy to learn and understand. let's study and learn "Why don't return pointers or references to local objects in C++?"

Never return a pointer or reference to a local object, directly or indirectly.

Reason (reason)

To avoid the crashes and data corruption that can result from the use of such a dangling pointer.

To avoid crashes and data corruption caused by the use of this dangling pointer.

Example, bad (negative example)

After the return from a function its local objects no longer exist:

When the program exits from the function, the local variables in the function no longer exist.

Int* f () {int fx = 9; return & fx; / / BAD}

Void g (int* p) / / looks innocent enough {int gx; cout

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