Detailed resolution of the erase usage and return values for the STL container set map vector

Summarize my experience and lessons in work.

When using a list, set, or map to iterate over removing certain elements:

Use method 1 correctly

      std::list< int> List;
      std::list< int>::iterator itList;
      for( itList = List.begin(); itList != List.end(); )
      {
            if( WillDelete( *itList) )
            {
               itList = List.erase( itList);
            }
            else
               itList++;
      }

Use method 2 correctly  

    std::list< int> List;
      std::list< int>::iterator itList;
      for( itList = List.begin(); itList != List.end(); )
      {
            if( WillDelete( *itList) )
            {
               List.erase(itList++);
            }
            else
               itList++;
      }

Use method 3 correctly

      std::list< int> List;
      std::list< int>::iterator it, next;
      for( it = List.begin(), next = it, next ++; it != List.end(); it = next, ++next)
      {
            if( WillDelete( *it) )
            {
               List.erase(it);
            }
      }

Note: method 3 is more subtle, but note that method 3 is to determine whether the container is empty or not before using it, otherwise the iterator will fail.

I tested that set.erase does not return the iterator and list returns.
The vector   Delete operation

std::vector <PACK_PRINT>::iterator It ; 
for(It=printItems.begin();It!=printItems.end();) 
{ 
  //I mean, how do you know that pack_print.bh =0 in printItems
  if( It.bh ==0) //Is that right?
  {//delete
       It=printItems.erase(It); 
  } 
  else 
  {// Don't delete
       ++It; 
  } 
}

std::vector <PACK_PRINT> printItems;
int i = 0;
while(i < printItems.size())
{

          if(printItems[i].bh == 0)  //So let's say I want to delete pack_print.bh =0 in the printItems. Is there anything wrong with deleting this way?
          {//delete
                printItems.erase(printItems.begin() + i);
          }
          else
          {// Don't delete
                ++i;
          }
}