Question

Possible Duplicate:
Erasing an element from a container while inside a range-based for loop

Similar to this, can you delete from an STL list while iterating over it using the new for( auto item : list ) syntax?

Here’s a complete example (that crashes!)

#include <list>
using namespace std ;

int main()
{
  list<int> li;
  li.push_back( 4 ) ;
  li.push_back( 5 ) ;
  li.push_back( 6 ) ;
  for( auto num : li )
  {
    if( num == 5 )
      li.remove( num ) ;
    else
      printf( "%d\n", num ) ;
  }
}

Answer 1

No, you can not. Your example crashes because you use li.remove(num) incorrectly and internal for-loop iterator is invalidated.

li.remove(num) should be used not in loop but as standalone statement. List member function remove iterates through all elements of a list and removes ones equal to value.