It is not used as a parameter, you cannot use global variables, and you cannot use it as a return value. How to use this

珈蓝易拉罐

Oh, no, this cannot be copied. There is a pointer inside.

But no matter what method you use (global variables or other), as long as it is passed to it, it will always be modified.
Unless you do n’t pass it on, but how do you use it if you do n’t pass it on?

Or you just pass the file name and let him open a new one by himself.

jinyuyi

This problem has troubled me for a few days
I want to encapsulate a file system

珈蓝易拉罐

Whether it is global or local, as long as it finally lets it know which variable, it is no different from passing parameters.

jinyuyi

Thank you very much for the prompt of珈蓝易拉罐! It seems that some ideas can be achieved

珈蓝易拉罐

Unless you do n’t tell it and let it guess for yourself, but now the program needs to run down again, what if it ca n’t guess?

jinyuyi

Thank you珈蓝易拉罐for your tips! I try to do it. Thank you

baguai

There is a problem with the landlord's language. The topic was read for a long time, but I didn't understand it.

jinyuyi

It may be that I have expressed too well, and I want to express too much meaning, sorry, trouble everyone, sorry, the problem has been solved! thank you all!