Re: [boost] boost::function< R (*) (A1, A2) >

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2002-07-19 11:26:57

From: "Douglas Gregor" <gregod_at_[hidden]>

> On Friday 19 July 2002 11:44 am, David Abrahams wrote:
> > > Maybe version the old boost::function code (e.g., stick it in
> > > boost::deprecated and supply an import library), and provide a
completely
> >
> > new
> >
> > > version based on this syntax?
> >
> > If we could find a way to provide a warning for uses of the deprecated
> > syntax as a transition plan, that would be ideal.
>
> I haven't seen any easy way to emit a warning at compile-time, but we
could
> guarantee to annoy the user at run-time if they use the deprecated
syntax,
> like this:
>
> struct deprecated_boost_function_syntax {
>   deprecated_boost_function_syntax()
>   {
>     std::cerr << "Warning: using deprecated Boost.Function syntax"
>               << std::endl;
>     // yada yada yada
>   }
> };

No thanks.

How about inducing an unused variable warning?
It's not reliable, but at least those who care will hear about it.

-Dave