Erase/Remove contents from the map (or any other STL container) while iterating it

Question

Allegedly you cannot just erase/remove an element in a container while iterating as iterator becomes invalid. What are the (safe) ways to remove the elements that meet a cer

Answer 1

1.For std::vector<> :

std::vector  vec;
vec.erase(std::remove(vec.begin(),vec.end(), elem_to_remove), vec.end());

2.For std::map<> always use std::map::erase()

std::map myMap;
myMap.emplace(std::make_pair(1, "Hello"));
myMap.emplace(std::make_pair(2, "Hi"));
myMap.emplace(std::make_pair(3, "How"));
myMap.erase( 1);//Erase with key
myMap.erase(myMap.begin(), ++myMap.begin() );//Erase with range
for( auto &ele: myMap)
{
    if(ele.first ==1)
    {
        myMap.erase(ele.first);//erase by key 
        break; //You can't use ele again properly 
               //wthin this iteration, so break.
    }
}

3. For std::list use std::list::erase()