People, and their irrational fear of string mixins

[Simen kjaeraas]

On Mon, 07 Dec 2009 16:55:43 +0100, downs <default_357-line at yahoo.de>  
wrote:

> Nick Sabalausky wrote:
>> I just noticed in D1 that the values for the cases in a switch must be  
>> known
>> at compile-time (btw, the docs don't seem somewhat vague on that). Is  
>> this
>> also true in D2? If so, I don't suppose we could get that changed  
>> before the
>> book? It's a real PITA for dynamic code.
>>
>>
>
> I wish they'd get over it.
>
> import tools.base;
>
> ...
>
> mixin(
>   ReplaceConcat!(2, "if (x == #) { ! } else",
>     "#", "!",
>     "A", "handleTheACase; ",
>     "B", "handleTheBCase; ",
>     "C", "handleTheCCase; "
>   )
>   ~ " assert(false); "
> );

Now if only D templates handled variadic alias parameters, and my idea of  
mixin templates, we could instead have this syntax:

int n;
SwitchCase!( n,
   A, handleA(),
   B, handleB(),
   C, handleC(),
   assert( false )
);

-- 
Simen