vagetablechicken edited a comment on issue #2697: Using a range for loop and erasing an item may cause mem error URL: https://github.com/apache/incubator-doris/issues/2697#issuecomment-571913539 Based on https://en.cppreference.com/w/cpp/language/range-for, I produce code equivalent to the following: ``` for(auto beg=m.begin(), end=m.end(); beg !=end; ++beg){ auto ita=(*beg).second.find(2); if(ita != (*beg).second.end()) (*beg).second.erase(2); if((*beg).second.empty()){ m.erase((*beg).first); } } ``` The valgrind report is the same like 'range for statement'. So I infer that using a range for loop and erasing an item can't avoid iterator invalidation. Although, I can't confirm how range for statement runs. Maybe the stl sources have the answer.
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