Re: [Boost-users] [mpl] SourceClass --> DestClass mapping

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-04-03 14:16:59

AMDG

Igor Rubinov wrote:
> Hello,
>  
> This is kind of newbie question. Any help would be greatly appreciated :).
>  
> I'd like to map (SourceClass_i) list to (DestClass_i) list in the way 
> that for any instance of SourceClass_i passed to the mapping 
> expression, an instance of DestClass_i will be created and the result 
> of the expression would be of type DestClass_i.
>  
> I defined the mapping as follows:
>  
> typedef mpl::map<
>  mpl::pair<SourceClass1, DestClass1>,
>  mpl::pair<SourceClass2, DestClass2> //, etc...
> > source2dest;
>  
> Now I guess I have to take the result of mpl::at<source2dest, 
> SourceClass> and apply kind of:
>  
> template<typename DestClass> struct Creator
> {
>   static DestClass create()
>   {
>     return *new DestClass;
>   }
> };
>
> ...but unfortunately the things don't come together.
>  
> Thank you in advance!

How do you intend to use this.

Creator<mpl::at<source2dest, SourceClass1>::type>::create()?

Can you be more specific about the problem.  What you have
ought to work (Almost.  create should say return DestClass(), otherwise
you have a memory leak)

In Christ,
Steven Watanabe