Why is "using namespace std" considered bad practice?
user444 Published in March 18, 2018, 1:54 am
I've been told by others that writing using namespace std in code is wrong, and that I should use std::cout and std::cin directly instead.
Why is using namespace std considered a bad practice? Is it inefficient or does it risk declaring ambiguous variables (variables that share the same name as a function in std namespace)? Does it impact performance?