Namespaces

Scopes: global, class, function, local, statement

Namespaces help distinguish between identical variable names from different contexts.

Using

using declaration:

• using std::string — “when I write string, I mean std::string”
• specific to one function/class

using directive:

• using namespace std — “when you can’t find a name in this scope, look in std”
• can be dangerous, you might not get what you’re looking for