Re: static switch/pattern matching

[Lodovico Giaretta via Digitalmars-d-learn]

On Saturday, 25 June 2016 at 12:30:22 UTC, Lodovico Giaretta 
wrote:
If you want this to work, you need your lambdas to take the 
casted value as a parameter:

   void test(T)(T value) {
     int i;
     string s;
     match!(value,
       int, (val) => i = val,
       string, (val) => s = val
     );
   }
And of course you need to modify match! for this to work.

Something like this:

   void match(alias t, cases...)() {
     static if (cases.length == 1) cases[0]();
     else static if (cases.length > 2) {
       static if (is(typeof(cases[0]) == bool)) {
         static if (cases[0]) cases[1](t);
         else match!(t, cases[2 .. $]);
       }
       else static if (is(typeof(t) == cases[0])) cases[1](t);
       else match!(t, cases[2 .. $]);
     }
   }

   void test(T)(T value) {
     int i;
     string s;
     match!(value,
       int, (val) => i = val,
       string, (val) => s = val
     );
   }

   void main()
   {
     test(1);
     test("A string");
   }