A Perspective on D from game industry

[Timon Gehr via Digitalmars-d]

On 06/17/2014 03:36 PM, John Colvin wrote:
>>
>
> also, foreach that works outside of function scope would be awesome:
>
> mixin template A(TL ...)
> {
>      foreach(i, T; TL)
>      {
>          mixin("T v" ~ i.to!string);
>      }
> }

Also, identifier mixins might then somewhat clean up a lot of code. The 
cases where a declaration name needs to be generated and this forces the 
whole declaration to be written in awkward string interpolation style 
are just too common, even more so if static foreach is supported (if 
there is any named declaration inside the static foreach body at all and 
the loop loops more than once, mixins will be required to prevent name 
clashes.)

Eg:

mixin template A(T...){
     static foreach(i,S;T){
         S mixin(`v`~i.to!string);
         auto mixin(`fun`~i.to!string)(S s){
             // lots of code potentially using `i' without first
             // converting it to a string only for it to be parsed back.
             // ...
             return s.mixin(`member`~i); // I've wanted this too
         }
     }
}

Also, there may be cases where one really wants to have local 
declarations (eg. enums) inside the static foreach loop.

(I really need to get around to polishing/make formal that static 
foreach DIP!)