string mixin and alias

[Jesse Phillips via Digitalmars-d-learn]

On Friday, 29 July 2016 at 18:34:56 UTC, Jesse Phillips wrote:
> Here the generateCode() is mixed in to the context of foo(), 
> which is fine if your code is performing actions but is no good 
> if you're creating declarations that you want to use in the 
> context of main().

Here is a fully functioning example:

-----------
     string generateCode(string s){return s;}

     void main()
     {
         int a, b;
         enum s = "a = 2 + 3; b = 4 + a;";
         foo!(s)(a, b);
         assert(a == 5);
         assert(b == 9);
     }

     void foo(alias s)(ref int a, ref int b) {
         mixin(generateCode(s));
     }
-----------