How can I detect the last iteration in a loop over std::map?

Question

I\'m trying to figure out the best way to determine whether I\'m in the last iteration of a loop over a map in order to do something like the following:

for          


        

Answer 1

The following code would be optimized by a compiler so that to be the best solution for this task by performance as well as by OOP rules:

if (&*it == &*someMap.rbegin()) {
    //the last iteration
}

This is the best code by OOP rules because std::map has got a special member function rbegin for the code like:

final_iter = someMap.end();
--final_iter;