Re: [boost] [optional] rebinding references

From: Hamish Mackenzie (hamish_at_[hidden])
Date: 2005-10-18 19:33:56

On Tue, 2005-10-18 at 14:52 -0300, Fernando Cacciola wrote:
> // (1) Current case:
> o = rb ; // rebind or not??
> 
> // (2) Antonty's proposal:
> o.reset(rb); // still some room for doubts?
> 
> // (3) Sam's proposal:
> o = make_optional(rb); // Clearly rebinds, doesn't it?
> 
> // I just introduced make_optional() here to get rid of the template 
> argument
> 

I am kind of diving in here having not read much of the option< T & >
stuff in this thread, but how about..

  o = make_optional( &rb );

To balance the indirection of *o and o->

Also, could be compatible with pointers

  int * p = make_optional( &rb );
  o = make_optional( p );
  p = make_optional( o );

See my earlier post for an example (I used "opt" instead of
"make_optional").

Hamish

PS. I know, I was the one arguing against pointer interfaces a few hours
ago and now I want more :-) (but not safe_bool, "!o" or "o != 0")