namelookup with Unqualified name : C++0x draft n3290

A point from the ISO C++ Draft n3290 : 3.4.0 2nd point

A name “looked up in the context of an expression” is looked up as an unqualified name in the 开发者_运维技巧scope where the expression is found.

Would someone please explain this statement with an example?

---

It says that the scope which contains the expression will be searched for the name. i.e.

namespace foo { 
  struct bar {
    void foobar() {
      do_something();
    }
  };
}

if you have this code the name do_something will be searched in the scope of foobar, bar, foo and in the global scope (and not in other namespaces, structs or function scopes)