Re: [boost] Index_set observations

From: JOAQUIN LOPEZ MU?Z (joaquin_at_[hidden])
Date: 2004-03-29 16:15:54

----- Mensaje original -----
De: Shannon Stewman <stew_at_[hidden]>
Fecha: Lunes, Marzo 29, 2004 10:33 pm
Asunto: Re: [boost] Index_set observations

> On Mon, Mar 29, 2004 at 08:14:09AM +0200, Joaqu?n M? L?pez Mu?oz 
> wrote:
> > If the insertion violates some constraint, then it does
> > not take place. insert operations return a
> > pair<iterator,bool>: the bool indicates whether insertion
> > succeeded or not.
> 
> Forgive me if this has already been asked, but why don't you 
> return a
> boost::optional<> object?
> 

It has not been asked before. The only reason is
that this is how STL containers (like std::set) do
it. But this raises an interesting possibility.
Maybe optional<T> can be augmented with a ctor
accepting an std::pair<T,bool>. I'll post this
in a separate thread.

Thanks,

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo