swift - how to avoid an object being deallocated? -

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static func appendmissingobjtoarray(var oldarray:[anyobject],newarray:[anyobject]){     n in newarray{         var isexist = false         o in oldarray{             if(n.isequal(o)){                 //exist                 isexist = true                 break             }         }         if(!isexist){             oldarray.append(n)         }     } }

the above function append data newarray oldarray. when function done. , getting data oldarray, got bad access error. think due newly added object in oldarray have been deallocated , newarray released.

any thing can avoid this?

i believe need declare oldarray parameter inout. follows:

//... static func appendmissingobjtoarray(inout oldarray:[anyobject],newarray:[anyobject]){ //...

you can e.g (note ampersand & below:

class01.appendmissingobjtoarray(&myoldarray, newarray: mynewarray) println(myoldarray) // contain appended result

done myoldarray (the passed array) mutated. may need pass copy of original if retaining original important.


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