Re: [boost] boost::any operations

From: Jorge Lodos (lodos_at_[hidden])
Date: 2006-04-24 18:31:14

Alexander Nasonov wrote:
> 
> Jorge Lodos wrote:
> > Hi
> > The following is a  partial solution for boost::any operations, 
> > including operator==.
> > [ skiped ]
> > This is different from any_cast in that it returns a reference, 
> > instead of a copy. Note also that this will never be used 
> implicitely, 
> > you have to call operator ValueType&() explicitely.
> 
> any_cast already supports reference types.
> 
Sure, but it returns a copy of the holded object. The described operator
returns a reference to the holded object. 

> There is another way of doing this:
> 
> typedef mpl::vector< less<typeof(_1 == _2)>
>                    , plus<typeof(_1 +  _2)>
>                    > ops;
> any<ops> a = 0;
> any<ops> b = a + a;
> 
> assert( b == a );
> 
> I have a partial solution but I want better multimethods.
> 
Nice, thanks for sharing. 

Cheers
Jorge