Question RE. STL's <set>

[Metro_Mystery]

set<DWORD> someSet;
pair< set<DWORD>::Iterator, bool > prInsertNumN;

someSet.Insert(SomeValue1);
someSet.Insert(SomeValue2);
...
prNInsert = someSet.Insert(SomeValueN);
someSet.Insert(SomeValueN+1);
someSet.Insert(SomeValueN+2);
...

//prNInsert.first has become invalid...

Basically- I'd like the someSet iterator prNInsert to stay pointing to the SomeValueN element, even though things are being inserted/removed in the set to which it belongs before and after it.

Is this even possible- and ny ideas how I may do this?

Thanks heaps