Method traverse

UnitTests/TestApp/pugixml.cpp:5143–5189

	}

	PUGI__FN bool xml_node::traverse(xml_tree_walker& walker)
	{
		walker._depth = -1;

		xml_node arg_begin = *this;
		if (!walker.begin(arg_begin))
			return false;

		xml_node cur = first_child();

		if (cur)
		{
			++walker._depth;

			do
			{
				xml_node arg_for_each = cur;
				if (!walker.for_each(arg_for_each))
					return false;

				if (cur.first_child())
				{
					++walker._depth;
					cur = cur.first_child();
				}
				else if (cur.next_sibling())
					cur = cur.next_sibling();
				else
				{
					// Borland C++ workaround
					while (!cur.next_sibling() && cur != *this && !cur.parent().empty())
					{
						--walker._depth;
						cur = cur.parent();
					}

					if (cur != *this)
						cur = cur.next_sibling();
				}
			} while (cur && cur != *this);
		}

		assert(walker._depth == -1);

		xml_node arg_end = *this;
		return walker.end(arg_end);
	}

	PUGI__FN size_t xml_node::hash_value() const
	{