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 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 //-----------------------------------------------------------------------------

 var BUGNUMBER     = "(none)";

 var summary = "Fibonacci generator by matrix multiplication";

 var actual, expect;

 printBugNumber(BUGNUMBER);

 printStatus(summary);

 /**************

  * BEGIN TEST *

  **************/

 function fib()

 {

   var init = [1, 0];

   var mx = [[1, 1], [1, 0]];

   while (true)

   {

     yield init[1];

     var tmp = [,];

     tmp[0] =

       mx[0][0]*init[0] + mx[0][1]*init[1];

     tmp[1] =

       mx[1][0]*init[0] + mx[1][1]*init[1];

     init = tmp;

   }

 }

 var failed = false;

 var it = fib();

 try

 {

   if (it.next() != 0)

     throw "F_0 failed";

   if (it.next() != 1)

     throw "F_1 failed";

   if (it.next() != 1)

     throw "F_2 failed";

   if (it.next() != 2)

     throw "F_3 failed";

   if (it.next() != 3)

     throw "F_4 failed";

   if (it.next() != 5)

     throw "F_5 failed";

   if (it.next() != 8)

     throw "F_6 failed";

 }

 catch (e)

 {

   failed = e;

 }

 expect = false;

 actual = failed;

 reportCompare(expect, actual, summary);