C++ STL: Which method of iteration over a STL container is better?

Question

This may seem frivolous to some of you, but which of the following 2 methods of iteration over a STL container is better? Why?

Answer 1

If you don't mind a (very?) small loss of efficiency, i'd recommend using Boost.Foreach

BOOST_FOREACH( Elem& e, elemVec )
{
    // Your code
}