The step clause of this for-loop is not of the expected form

for(auto Itr = PropVal.value.int32Values.begin();Itr != PropVal.value.int32Values.end();Itr++)

The step clause of this for-loop is not of the expected form. It must be an expression whose only persistent side effect is to modify the loop counter. The loop counter has been identified as <cs.ast [cc:variable] Itr>.

what is the alternative way?