Is there a way to access the next line with getline() with c++?

Question

I am trying to access the next line to check if I would like to change a variable or not. Specifically, I want to check if the difference between the current value and the next one is less than a number, if it is not than I would like to assign a different value to a variable, but if it its than I want to retain the value I have now. My question is, is there a way to "look ahead" with getline(), kind of like an equivalent of i+1 in a for loop.

Answer 1

I suggest to defer acting on the first line until the second is parsed.

Then you can decide whether to use a content from the first line or modify it.