Language/12_Expressions/18_Assignment_A08_t01.dart

/*
 * Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 * for details. All rights reserved. Use of this source code is governed by a
 * BSD-style license that can be found in the LICENSE file.
 */
/**
 * @assertion Evaluation of an assignment of the form e1[e2] = e3 is equivalent to the
 * evaluation of the expression (a, i, e){a.[]=(i, e); return e;} (e1, e2, e3).
 * The static type of the expression e1 [e2 ] = e3 is the static type of e3.
 * @description Checks that an assignment of the form e1[e2] = e3 is evaluated correctly.
 * @author rodionov
 * @reviewer kaigorodov
 */
import "../../Utils/expect.dart";

class C {
  var v, i;

  operator[](idx) {
    return v;
  }

  operator[]=(idx, val) {
    v = val;
    i = idx;
  }
}

main() {
  C c = new C();
  var res=(c[-10] = 1);
  Expect.equals(1, res);
  Expect.equals(1, c.v);
  Expect.equals(-10, c.i);

  Expect.equals(2, c[true] = 2);
  Expect.equals(2, c.v);
  Expect.equals(true, c.i);

  c["foo"] = 1;
  Expect.equals(1, c.v);
  Expect.equals("foo", c.i);

  c[-1.1] = 2 * 6;
  Expect.equals(12, c.v);
}