[nemetroid]

While I agree with the general point of using best practices in code samples, the Cpp Core Guidelines actually encourage[0] using

  using namespace std;

for std specifically, giving the reasoning that:

> sometimes a namespace is so fundamental and prevalent in a code base, that consistent qualification would be verbose and distracting.

I also work mainly in C++, and personally I prefer using it, together with -Wshadow to catch possible issues.

0: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppC...

[jhasse]

Problems arise when you upgrade your compiler and a new symbol was added to std::