What does a “friend” do in obj c?

Question

I am working on a project in which I created a class called Friend, and only noticed that Xcode colors it as a keyword or modifier. Can I use it, as in my code, or has a different purpose?

Updated: It seems that this has already been answered:

Why does the xcode IDE think that `friend` is a reserved word

But thanks for helping the guys!

Answer 1

++ friend, . , ( ) . , class:

aClass;

, , - , . , , , .

Answer 2

friend - , C++ .
Objective C C, ++, .

: ++