What are the functions of the getline function in C++?

In C++, the getline function can achieve the following:

1. Read a line of string from the input stream.
2. Save the read string into a specified string variable.
3. Stop reading when encountering a line break or end-of-file character.
4. Specify a delimiter to stop reading when it is encountered.
5. Specify the maximum number of characters to read to prevent overflow.
6. This can be used together with input stream objects, such as cin, to read a line of string from the standard input.

Overall, the getline function is used to read a line of string from the input stream and store it into the specified string variable, being one of the commonly used input functions in C++.