Effective STL 27 convert a container's con

use distance and advance to convert a container’s const_iterators to iterators. both of which are declared in <iterator>

typedef deque<int> IntDeque; typedef IntDeque::iterator Iter; typedef IntDeque::const_iterator ConstIter; IntDeque d; ConstIter ci; ... Iter i(d.begin()); // figure the distance between i and ci (as const_iterators), // then move i that distance advance(i, distance<ConstIter>(i, ci));