for (std::map < int, int >::iterator It = myMap.begin(); It != myMap.end(); It++)

#include <map>

int main()
{
   std::map < int, int > myMap;    
    for (int i = 0; i < 10; i ++)   
    {   
     myMap[i] = i;   
    }

   std::map < int, int >::iterator beg = myMap.begin();
   for (std::map < int, int >::iterator It = myMap.begin(); It != myMap.end(); ++ It)   
   {   
    if (It->first == 5)   
    {
     It = myMap.begin();   
     if(beg == It) break;
    }
   }
}

for(std::map <int, int>::iterator It = myMap.begin(); It != myMap.end();)
{
   if(It->first == 5)
   {
     It = myMap.begin();
   }
   else
     It++;
}