Hi Kalaky, #1. Please do not cross post to GCC-help and GCC lists. #2. GCC@xxxxxxxxxxx is not an appropriate forum for your question. #3. GCC-Help@xxxxxxxxxxx is not an appropriate forum for your question. #4. Your question is a general C++ question, not a GCC question. > Given that removing/inserting elements from a map/slist/whatever does > not invalidate iterators to list elements, it is safe to use the > element that the iterator "points" to ? The rules for iterator invalidation are tightly dependent on the container involved. I recommend reading the ISO 14882 standard very carefully about what STL containers guarantee about their iterators. (I always have to look them up myself -- I tend to pessimistically over-assume that my iterators are invalidated more often then they really are in actuality.) I'm pretty sure that removing an element from a container will cause any iterator pointing to that element to become invalidated, for all containers. How do you have an iterator to an element in a container, when that element hasn't been inserted into the container yet? *AFTER* an element is inserted into a container, and then you acquire an iterator to that element, I presume that iterator properly refers to that element. I recommend you use a "Safe STL" for your development. It will help you discover problematic STL usage in your code. Here are some "safe STL" implementations: http://www.horstmann.com/safestl.html http://www.stlport.org/ http://gcc.gnu.org/onlinedocs/libstdc++/debug.html Good luck! --Eljay
