Simple (bad) Practice question

I remember (do not ask from where) reading that:

#using namespace std

is bad coding practice. Is it true?
Depends. If it's under global scope (which most people who use this do) then yea. It can lead to naming conflicts on larger projects. If used correctly and smartly then no it's not a problem. Though I think it's much easier to avoid the potential issues altogether by just using std::whatever
thank you :)
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