Do you prefer explicit namespaces or 'using' in C++?

Question

When using C++ namespaces, do you prefer to explicitly name them, like this:

std::cout << \"Hello, world!\\n\";

Or do you prefer

Answer 1

I use always explicit ones. Writing std does not hurt me and I clearly see where is it from. It's useful when you have some legacy project to take care of with it's own "strings", "vectors" etc to maintain. The more information the code carries with it, the better.