What are the functions of the assign method in C++?

In C++, the assign function is used to assign the value of one string to another string, and overwrite the original value. Its specific functionality includes:

1. Assigning the value of one string to another.
2. Replace the existing values in the target string.
3. You can specify the starting position and length of the assignment.
4. When assigning a value at a specified position, if the length of the source string is not enough to complete the assignment, part of the string will be truncated for the assignment.
5. Return type is void, no value needs to be returned.

In general, the main purpose of the assign function is for assigning operations between strings.