dmd 2.029 release
Masahiro Nakagawa
repeatedly at gmail.com
Wed Apr 22 20:41:02 PDT 2009
Changed sender name from screen name to real name.
On Thu, 23 Apr 2009 02:55:37 +0900, Steven Schveighoffer
<schveiguy at yahoo.com> wrote:
>
> On Wed, 22 Apr 2009 13:49:18 -0400, Andrei Alexandrescu
> <SeeWebsiteForEmail at erdani.org> wrote:
>
>> tama wrote:
>>> On Mon, 20 Apr 2009 16:09:09 +0900, Walter Bright
>>> <newshound1 at digitalmars.com> wrote:
>>>
>>>>
>>>> This is a major revision to Phobos, including Andrei's revolutionary
>>>> new range support.
>>>>
>>>> http://www.digitalmars.com/d/2.0/changelog.html
>>>> http://ftp.digitalmars.com/dmd.2.029.zip
>>>
>>> Range is so cool!
>>>
>>> Though...
>>> I tried following code:
>>>
>>> void main()
>>> {
>>> writeln("Case1");
>>> {
>>> Mt19937 gen = Mt19937(0);
>>> writeln(gen.front);
>>> gen.popFront;
>>> writeln(gen.front);
>>> }
>>> writeln("---");
>>> {
>>> Mt19937 gen = Mt19937(0);
>>> advance(gen, 1); // skip 1 element
>>> writeln(gen.front);
>>> gen.popFront;
>>> writeln(gen.front);
>>> }
>>> writeln("\nCase2");
>>> {
>>> Mt19937 gen;
>>> writeln(gen.front);
>>> gen.popFront;
>>> writeln(gen.front);
>>> }
>>> writeln("---");
>>> {
>>> Mt19937 gen;
>>> advance(gen, 1); // skip 1 element
>>> writeln(gen.front);
>>> gen.popFront;
>>> writeln(gen.front);
>>> }
>>> }
>>>
>>> Result:
>>>
>>> Case1
>>> 2357136044 (1)
>>> 2546248239 (2)
>>> ---
>>> 2546248239 (2)
>>> 3071714933 (3)
>>>
>>> Case2
>>> 581869302 (1)
>>> 3890346734 (2)
>>> ---
>>> 581869302 (1)?
>>> 3890346734 (2)?
>>>
>>> I think 'Case1' is correct, but 'Case2' is wrong.
>>> Mt19937's bug?
>>>
>>
>> If you initialize the Mersenne twister with no seed it will start with
>> seed 5489u.
>
> I think his point is in the second part of Case2, he skipped one
> element, but it appears that it didn't skip anything.
Thanks for your comment.
Lack of talk about this problem:|
--
tama <repeatedly at gmail.com>
http://profile.livedoor.com/repeatedly/
More information about the Digitalmars-d-announce
mailing list