c++ - Iterating over a QList backwards -
if execute following code: qlist<int> l; qlist<int>::const_iterator li; l.append(1); l.append(2); l.append(3); l.append(4); li = l.constend(); while(li != l.constbegin()) { std::cout << *li << std::endl; --li; } i output: 17 4 3 2 i solved using qlistiterator<int> , don't why isn't working! thanks in advance ... try li = l.constend() - 1; i'm not sure if solves problem, far know, end iterators point 1 past end of container. i wanted address concern in comments. when this: li = l.constend(); while(li != l.constbegin()) { std::cout << *li << std::endl; --li; } you start off end of container, , loop never reaches constbegin . that's because when decrement, li becomes constbegin , while loop doesn't execute. (that's why 1 never outputted.) but if do: li = l.constbegin(); while(li != l.constend()) { std::cout << *li << std::endl; ++li; } the same thing happe...
