View source for Linklist.insertbefore

== Calling Pattern ==
Call
 local k = sl.linklist()
 -- later
 local n = k.insertbefore(a,b)

Arguments
 a is a number
 b is any value

Results
 n is a number

== Example Usage ==

 local k = sl.linklist()
 local j = k.insertb(0,'one')
 local j0 = j
 j = k.insertb(j,'two')
 j = k.insertb(j,'three')
 print(k.getpos(j0))
 print(k.getpos(j))

 --> 3
     1 

== Description ==

Calling insertbefore creates a new link with value b and inserts it before the link with psuedo-index a.  If the list is empty, a can be any number and the new link is also the head and tail of the list.  If the list is non-empty and a is not a valid pseudo-index, then insertbefore fails and returns 0.

== See Also ==

* [http://www.easyuo.com/openeuo/wiki/index.php/Simplelib simplelib]

* [[deque]]

* [[linklist]]
* [[linklist.head]]
* [[linklist.insertafter]]
* [[linklist.length]]
* [[linklist.nextlink]]
* [[linklist.prevlink]]
* [[linklist.removelink]]
* [[linklist.returntable]]
* [[linklist.setvalue]]
* [[linklist.swap]]
* [[linklist.tail]]
* [[linklist.value]]