Getting enum from value

[Matthew Remmel via Digitalmars-d-learn]

I feel like I'm missing something, but there has to be an easier 
way to convert a value into an enum than switching over every 
possible value: i.e

enum Capitals {
     Indiana = "Indianapolis",
     Illinois = "Chicago",
     Ohio = "Columbus"
}

Capitals enumFromValue(string s) {
     switch (s) {
         case Capitals.Indiana:
             return Capitals.Indiana;
          case Capitals.Illinois:
             return Capitals.Illinois;
          case Capitals.Ohio:
             return Capitals.Ohio;
          default:
              throw new Exception(format("No Capitals enum member 
with value %s", s));
     }
}

int main() {
     Capitals c = enumFromValue("Chicago"); // works

     // I tried using std.conv, but it matches on the enum member 
name
     c = to!Capitals("Chicago") // fails, no member named Chicago
}

With how redundant the enumFromValue(string) implementation is, I 
would think there would be an easier way to do it. I'm sure you 
could use a mixin, a template, or std.traits. I was hoping there 
was a more 'builtin' way to do it though. Something along the 
simplicity of:

int main() {
     Capitals c = Capitals("Chicago");
}

Any ideas?