Yesterday in the Chrome codebase I stumbled upon this pattern:

namespace fishtaco {
namespace {
  int foo = 5;
}
}

If that namespace doesn’t have a name, how does anything refer to it?

Turns out this is the accepted way of including static members in a C++ namespace. Applying the static keyword means that only one of this will ever exist, no matter how many times the class is instantiated. You’d use static in the context of a namespace to keep it private to that namespace.