Re: Tuples: draft 1

[chris <caj at cs dot york dot ac dot uk>]

>  
>
> > 2) I declare "extern shallow_assign ignore". This needs to be actually 
> > created somewhere..
> >    
>
> Do you mean you need to link against it? What is shallow_assign ignore, exactly?
>  
Probably quickest to give the whole definition :)

Given in the specification is the following;

struct swallow_assign
{
 template <class T>
 swallow_assign&
 operator=(const T&)
   {return *this;}
};
extern swallow_assign ignore;

The idea is that when using "tie" to join together a number of variables 
then this "ignore" can be used in places where we don't care about the 
variable. The standard states that a variable of type "swallow_assign" 
called ignore will be provided. However this will of course have to be 
actually defined somewhere once :)

Chris