C++ How to loop through set in map? -

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i stuck on 1 problem in school project: need set of numbers mapped key number. zz class big integers ntl library, that's not important. program fails on inner loop message it_set2 can't iterable.

std::map<zz, std::set<zz>> mapa;   std::map<zz, std::set<zz>>::iterator it_map;   std::set<zz>::iterator it_set1, it_set2;      (it_map = mapa.begin(); it_map != mapa.end(); ++it_map) {            (it_set1 = it_map->second.begin(); it_set1 != it_map->second.end(); ++it_set1) {         (it_set2 = ++it_set1; it_set2 != it_map->second.end(); ++it_set2) {             /*             function uses *it_set1, *it_set2             */         }     } }

thanks help.

i suppose problem in inner loop. if want it_set2 point next element it_set1 pointing (but not incrementing it_set1) should change third loop following: for(it_set2 = it_set1; ++it_set2 != it_map->second.end(); ).

this make sure you're not going out of bounds , not incrementing it_set1 when not necessary.


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