RE: Iterating through all nodes and attributes of a wxXmlDocument

I wonder if a range adapter might make situations like this easier to 
code? One might have something like this:

for (auto child : node->GetChildrenAsRange()) doSomethingWithNode(child);

for (auto attr : node->GetAttributesAsRange()) 
doSomethingWithAttribute(attr);

The adapter classes returned by the new APIs could be very simple child 
classes of wxNode, defining a constructor, begin(), end(), the 
preincrement operator, and the dereference operator.

The constructor could take an optional filter predicate that skips nodes 
that don't match the predicate.



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