[boost] Koenig lookup swap.

Would anyone be interested in me adding an koenig lookup swap function to boost? (I would say it belongs in boost.utility). It would be a swap function that uses Koenig lookup to find the 'best' swap funciton, falling back on std::swap like this: template <class T> void koenig_swap(T& left, T& right) { using std::swap; swap(left,right); } Several boost libraries (multi array, compressed pair, graph, optional, spirit) already use this technique, each time explicitly with 'using std::swap' instead of abstracting it out.