TextIter and forward_search

[rob page <page rob gmail com>]

How can I properly construct a null TextIter for use with forward_search

"limit: 	Bound for the search, or 0 for the end of the buffer."

from:
http://www.gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGtk_1_1TextIter.html#a98

Currently I'm constructing it from the c object but this really isn't ideal.

also, from the same function is there any way to set no flags, i've
tried setting this as 0 to no avail.

Thanks.
Rob