c++ Remove iterator in loop (map of maps)

Question

I have a map of maps and during the iteration i need to delete the iterator like i show in the follow code. What is the best way to do this?

 for (Map1_t::iterator itOutMap = map1.begin(); itOutMap != map1.end(); ++ itOutMap)
  {
    for (Map2_t::iterator itInMap = itOutMap->second.begin(); itInMap != itOutMap->second.end(); ++itInMap)
    {
      if (itInMap->first ==  USER_REQ_TYPE)
      {
        // need to delete the current itInMap
      }
    }
  }

IlBeldus · Accepted Answer · 2017-07-24 14:48:09Z

1

You can use std::map::erase() http://en.cppreference.com/w/cpp/container/map/erase the example in that page does exactly what you are asking

for (Map1_t::iterator itOutMap = map1.begin(); itOutMap != map1.end(); ++ itOutMap)
  {
    for (Map2_t::iterator itInMap = itOutMap->second.begin(); itInMap != itOutMap->second.end(); )
    {
      if (itInMap->first ==  USER_REQ_TYPE)
      {
        itInMap=itOutMap->second.erase(itInMap);
      }
      else ++itInMap;
    }

  }

edited Jul 24, 2017 at 14:48

answered Jul 24, 2017 at 14:26

IlBeldus

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