Namespace aliasing

Pretty simple question. For example i have few namespaces in my project, for example, like this:

namespace A{
  namespace B{
  }
}

and a buch of code\classes\functions in this namespace.

Also i have namespace C where i want to use classes\functions from B like this:

namespace C{
  AB::some_function()
}

To do this i want to make an alias to functions\classes inside B like this

namespace AB = A::B;

Q: Is a simple header file written like this

ab_typedefs.h

namespace A{
  namespace B{
  }
}
namespace AB = A::B;

is a good solution?