c++11 - Using iterator for removing items from map in c++ -

map<int, int> m_map; // ... map::iterator =  m_map.begin(); while (it != m_map.end()) {   m_map.erase(it++); } 

when ++ action take place? before or after erase? when safe so?

i don't think it's specified whether ++ happens before or after call erase. still, if guaranteed peformed before call, fact had asks shows code bad. there better, 100% safe alternative:

while (it != m_map.end()) {   = m_map.erase(it); } 

erase returns iterator element past erased one.