\r
implementation\r
\r
+uses sysutils;\r
+\r
procedure linklistadd(var baseptr:tlinklist;newptr:tlinklist);\r
var\r
p:tlinklist;\r
begin\r
+ if (newptr=baseptr) or assigned(newptr.prev) then raise exception.create('linklist double insertion detected');\r
p := baseptr;\r
baseptr := newptr;\r
baseptr.prev := nil;\r
if item = baseptr then baseptr := item.next;\r
if item.prev <> nil then item.prev.next := item.next;\r
if item.next <> nil then item.next.prev := item.prev;\r
+ item.prev := nil;\r
+ item.next := nil;\r
end;\r
\r
procedure linklist2add(var baseptr,newptr:tlinklist2);\r
var\r
p:tlinklist2;\r
begin\r
+ if (newptr=baseptr) or assigned(newptr.prev2) then raise exception.create('linklist2 double insertion detected');\r
p := baseptr;\r
baseptr := newptr;\r
baseptr.prev2 := nil;\r
if item = baseptr then baseptr := item.next2;\r
if item.prev2 <> nil then item.prev2.next2 := item.next2;\r
if item.next2 <> nil then item.next2.prev2 := item.prev2;\r
+ item.prev2 := nil;\r
+ item.next2 := nil;\r
end;\r
\r
constructor tlinklist.create;\r