mellow-arc-8120

readme.md

mellow-arc-8120

Created with <3 with dartpad.dev.

main.dart

class Getter<T> {}

T get<T>(Getter<T> getter) {
  if (T == int) {
    return 42 as T;
  } else if (T == String) {
    return "the answer to life, the universe, and everything" as T;
  }
  throw "Unexpected type: ${T.toString()}";
}

void main() {
  var intGetter = Getter<int>();
  var strGetter = Getter<String>();

  // This works:
  var intVal = get(intGetter);
  print(intVal);
  var strVal = get(strGetter);
  print(strVal);

  // This doesn't work, T is resolved to Object? (the argument
  // type of print()).
  //
  // But that is confusing because we are passing a Getter<int>,
  // not a Getter<Object?>.
  print(get(intGetter));
}