wish to add another xml_node::traverse function meber

[baixuefeng]

at present, the xml_node::traverse function:
...
if (!walker.for_each(arg_for_each))
return false;
...

But, sometimes, I want to use it like this:
...
if (walker.for_each(arg_for_each) && cur.first_child())
{
// traverse it's child tree
}
else
...

[zeux]

I don't understand the use case. Why can't you check this condition inside your for_each implementation?

[baixuefeng]

Case 1: When the function "for_each" return false , all traverse ended;
Case 2: When the function "for_each" return false, it mean that it only will not traverse it's child tree, but will continue to traverse it's sibling.

[zeux]

Ah, right. Yeah, this makes sense. Unfortunately, I can't easily change the existing interface because of binary compatibility issues. The interface has some other problems as well (e.g. https://code.google.com/p/pugixml/issues/detail?id=219) that warrant changing it though, so maybe it's necessary to introduce a new interface at this point and deprecate the old one.

[baixuefeng]

Haha, I think so too.

[zeux]

Closing in favor of #103, which has several different options and thoughts on the matter.