use Collection.Generic;

lambdas Func {
  Double : (FloatHolder) ~ FloatHolder
}

class FirstClass {
  function : Main(args : String[]) ~ Nil {
    vector := Vector->New()<Func2Holder <FloatHolder, FloatHolder> >;
    # store functions in collections
    vector->AddBack(Func2Holder->New(\Func->Double : (v)
      =>  v * v)<FloatHolder, FloatHolder>);
    # new function from preexisting function at run-time
    vector->AddBack(Func2Holder->New(\Func->Double : (v)
      => Float->SquareRoot(v->Get()))<FloatHolder, FloatHolder>);
    # process collection
    each(i : vector) {
      # return value of other functions and pass argument to other function
      Show(vector->Get(i)<Func2Holder>->Get()<FloatHolder, FloatHolder>);
    };
  }

  function : Show(func : (FloatHolder) ~ FloatHolder) ~ Nil {
    func(13.5)->Get()->PrintLine();
  }
}