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 happens, except loop terminates once reaches constend. logically makes sense, if constend didn't point past end of container, cut off , not output 4.