[phobos] Tango and the new time lib

[Lars Tandle Kyllingstad]

Having looked at Boost.Date_Time some more, I see that it's a quite big
library, and a lot more than we need.  Still, it is a (safe) place to
look so we don't reinvent the wheel.

Here's a very brief overview of the basic design concepts:
http://www.boost.org/doc/libs/1_42_0/doc/html/date_time.html#date_time.domain_concepts

Possible D translation, here represented by an unnecessarily verbose
example:

        TimePoint t1 = Clock.now;
        ...  // Perform some operation.
        TimePoint t2 = Clock.now;
        
        TimeInterval t12 = t1 - t2;
        TimeDuration deltaT = t12.duration;
        
        writeln("Operation started at %s and ended at %s.",
                GregorianCalendar.format(t1, "yyyy-mm-dd"),
                GregorianCalendar.format(t2, "yyyy-mm-dd"));
        writeln("Operation took %s milliseconds to complete.",
                deltaT.milliseconds);

-Lars


On Thu, 2010-04-29 at 10:10 +0200, Lars Tandle Kyllingstad wrote:
> The Boost.Date_Time library seems like a good starting point.
> 
> We could port all or parts of it to D without having to worry about
> licence issues, and it seems to contain all we need and more.  Does
> anyone have any experience using it?
> 
> -Lars
> 
> 
> On Wed, 2010-04-28 at 22:59 -0500, Andrei Alexandrescu wrote:
> > Now I'm glad I never looked at Tango. I suggest you post this to the 
> > newsgroup and we give up on Shoo's code. I don't empathize with the 
> > Tango fellows keeping their precious locked because it's very difficult 
> > to frame that action as having D's community interest at heart. To be 
> > frank their whole motivation looks petty and political to the extreme, 
> > particularly because it's not a rocket science library, it's a God damn 
> > date and time routines we're talking about.
> > 
> > To me there's only way out of this: define artifacts that are so much 
> > better than Tango's, it would be impossible to them to claim we stole 
> > from them.
> > 
> > 
> > Andrei
> > 
> > On 04/28/2010 09:38 PM, Walter Bright wrote:
> > > One of the Tango developers called me today. There are 5 developers of
> > > the Tango time library, and they feel that the Phobos time lib
> > > submission is close enough to theirs to be considered an infringement on
> > > their license. The Tango license is the BSD license, which does not
> > > permit others changing the license, such as to Boost which is the Phobos
> > > license.
> > >
> > > I am not qualified to compare the two source code bases and make a legal
> > > determination if there is infringement or not. And quite frankly, I
> > > don't want to split legal hairs about it against the Tango developers'
> > > wishes. I've invited the Tango devs to subscribe to this mailing list,
> > > and I hope we can come to a resolution:
> > >
> > > 1. I think the best solution would be for Tango to relicense the time
> > > module under the Boost license, which would require the agreement of the
> > > five time module developers. Then, the Phobos version would include them
> > > as authors and they'd share in the copyright.
> > >
> > > 2. Next would be if the Tango developers who do agree to the Boost
> > > license would identify their contributions, those would get authorship &
> > > copyright credit, etc. Tango developers who do not agree would identify
> > > code they consider infringing, and that code would be removed from the
> > > Phobos version, and possibly reimplemented by someone who has not looked
> > > at the Tango version.
> > >
> > >
> > > The bottom line is the Tango devs should get the final say on what is
> > > infringing and what isn't, and we won't relicense infringing code into
> > > Phobos without their explicit permission.
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> 
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