unordered_set non const iterator

Question

For testing purposes I created a little unordered_set and tried to iterate over the set. The set holds an own class:

class Student {
private:
    int matrNr;
         


        

Answer 1

unordered_set is a kind of data structure where you cant modify an item without changing its location.

Non-const iterator is const here 'cause STL does protect you from such an obvious mistake.

If you want to modify an unordered_set's item you have to remove it and add it again.