ios:: Explanation

[xantavis]

Hi, I am learning cpp with the help of a book. But suddenly, in the book they use ios:: . But they didn't explain it. They used it while explaining some functions that are possible with #include iomanip.

Can someone explain it for me?

Thx for your help!

[coder777]

ios is used for streams (for files and other):

http://www.cplusplus.com/reference/iostream/ios/