Re: [boost] [optional] rebinding references

From: Eric Niebler (eric_at_[hidden])
Date: 2005-10-14 18:27:24

AlisdairM wrote:
> 
> int a = 13;
> int &b = a;
> int c = 42;
> 
> optional< int & > d = b;
> d = c;
> 
<snip>
> 
> For the curious, the current answer is option 3 - d rebinds a reference
> to c.

Huh. IANAOU* but this seems surprising to me. I would expect this not to 
rebind the reference. Had I wanted that behavior, I would have used an 
int*, or else I would have done something like:

   optional< tr1::reference_wrapper<int> > d = b;

or some such. Has interoperability with tr1::reference_wrapper<> been 
pursued as a means to give boost::optional<> reference rebinding 
semantics which are ... optional? ;-)

* IANAOU == I am not an optional user

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com