Re: [Boost-users] [fusion] runtime unsigned to a template argument compile-time unsigned

Subject: Re: [Boost-users] [fusion] runtime unsigned to a template argument compile-time unsigned
From: Larry Evans (cppljevans_at_[hidden])
Date: 2010-02-22 11:17:10

On 02/22/10 10:02, Larry Evans wrote:
> On 02/21/10 05:27, Hicham Mouline wrote:
> [snip]
>>>
>> 3.       Can I generate an array of function pointers to the various 
>> at<>() functions and call the right one at runtime?
> 
> The 2 attached files show how this can be done.
> 
> Obviously, instead of:
> 
>         typedef
>       void(*
>     method_type
>     )(void)
>     ;
> 
> you'd have:
> 
>         typedef
>       double(*
>     method_type
>     )(void)
>     ;
> 
This could even be done for heterogeneous return types; however,
in that case, a tagged variant.  The tag for this variant would
be the field index.  In the attached code, this would be something
like the super_numerals.