Are unused includes harmful in C/C++?

Question

What are the negative consequences of unused includes?

I\'m aware they result in increased binary size (or do they?), anything else?

Answer 1

include means you are adding some more declarations. So when you are writing your own global function, you need to be carefull wheather that function is already declaerd in the header included.

Ex. if you write your own class auto_ptr{} without including "memory", it will work fine. but whenever you will include memory, compiler gives error as it already has been declared in memory header file