[boost] Re: [optional] new assignmet semantic and references

"Joao Abecasis" <jpabecasis@zmail.pt> escribió en el mensaje news:42249F77.7080402@zmail.pt...

Fernando Cacciola wrote:

...

If I change the code now to use T's operator=(), assignment of optional<T&> will have a _radically_ different semantics. A correct one, that's for sure, but end user code might be fundamentally impacted.

Maybe boost::reference_wrapper can be used internally to wrap reference types and solve this issue.

How? We're not talking about an implementation problem here; this is about the "correct" behaviour and whether is ok to change to it given the potential impact on user programs. Fernando Cacciola