Re: [boost] [optional] problems with swap()

Hi Andrey,

Your behavior can be implemented in a non-intrusive way something like that:

template< typename T > void force_koenig_swap(optional< T >& left, optional< T >& right) { bool left_empty = !left; if (left_empty) left = in_place(); bool right_empty = !right; if (right_empty) right = in_place();

using std::swap; swap(left.get(), right.get());

if (left_empty) right = none; if (right_empty) left = none; }

But isn't that, syntax aside, *exactly* the same Thorsten proposed?? I can't tell the difference... Best -- Fernando Cacciola SciSoft http://fcacciola.50webs.com http://groups.google.com/group/cppba