View source for Linklist.prevlink

== Calling Pattern ==
Call
 local k = sl.linklist()
 -- later
 local r = k.prevlink(a)

Arguments
 a is a number

Results
 r is a number

== Example Usage ==

 local k = sl.linklist()
 local j = k.inserta(0,'one')
 local j0 = j
 j = k.inserta(j,'two')
 j = k.inserta(j,'three')
 print(k.value(k.prev(j)))

 --> two

== Description ==

Calling prevlink returns the pseudo-index of the link preceding the valid link with pseudo-index a. If the list is empty, if a is the head of the list, or if a is otherwise an invalid pseudo-index, prevlink returns 0.  

== See Also ==

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

* [[deque]]

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