Return the value rather than passing through a pointer paramater

[GoogleCodeExporter]

Writing `node->GetValue(&val)` is less intuitive than writing `val =
node->GetValue()`. It would not be at all difficult to add an overload of
GetValue in both the Base and Attribute classes which provides this
functionality. Could this be done, please?

Original issue reported on code.google.com by celtic.m...@gmail.com on 18 Jun 2009 at 9:41