Re: [OT] fortran lib which provide python like data type

From	Marko Rauhamaa <marko@pacujo.net>
Newsgroups	comp.lang.python
Subject	Re: [OT] fortran lib which provide python like data type
Date	2015-02-01 09:58 +0200
Organization	A noiseless patient Spider
Message-ID	<8761bmf4gn.fsf@elektro.pacujo.net> (permalink)
References	(6 earlier) <0b8db0f6-75c5-4a8f-a9a5-51fa936b306e@googlegroups.com> <mailman.18316.1422641719.18130.python-list@python.org> <cj2g77Fpbv8U1@mid.individual.net> <87zj8zf8bv.fsf@elektro.pacujo.net> <871tma406m.fsf@jester.gateway.sonic.net>

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Paul Rubin <no.email@nospam.invalid>:

> Marko Rauhamaa <marko@pacujo.net> writes:
>> Stroustrup apparently has never had to deal with callbacks; his thick
>> books never made a mention of them last time I checked.
>
> C++ has function pointers just like C,

Et tu, Brute!

C's callbacks always use a void pointer for the "self reference." In C,
I can use void pointers and type casts idiomatically. In C++, type casts
are apostasy.

Qt gave up on C++ when it comes to callbacks ("signals") and went for an
apocryphal metacompiler.

> but more idiomatically you'd pass a class instance and the library
> would invoke some method on it.

Yes, that's what I ended up doing, defining a class for each callback
type:

   struct ButtonPushListener {
       virtual void buttonPush(int x, int y) = 0;
   };

(Yes, "struct" and not "class"! Why?)

Typing all of that in was quite a chore. All because Stroustrup didn't
think of delegates (Delphi, C#, Python). C++'s method pointers are
ridiculous and useless, they should have been defined as delegates.

> There is also Boost::Coroutine which can get rid of the need for
> callbacks in some situations.

Boost is the world's biggest fig leaf.

Marko

Thread

[OT] fortran lib which provide python like data type 1989lzhh <1989lzhh@gmail.com> - 2015-01-29 21:39 +0800
  Re: [OT] fortran lib which provide python like data type beliavsky@aol.com - 2015-01-29 14:39 -0800
    Re: [OT] fortran lib which provide python like data type Rustom Mody <rustompmody@gmail.com> - 2015-01-29 17:40 -0800
      Re: [OT] fortran lib which provide python like data type Christian Gollwitzer <auriocus@gmx.de> - 2015-01-30 08:32 +0100
        Re: [OT] fortran lib which provide python like data type Rustom Mody <rustompmody@gmail.com> - 2015-01-30 08:27 -0800
          Re: [OT] fortran lib which provide python like data type Michael Torrie <torriem@gmail.com> - 2015-01-30 10:08 -0700
            Re: [OT] fortran lib which provide python like data type Rustom Mody <rustompmody@gmail.com> - 2015-01-30 09:31 -0800
              RAII vs gc (was fortran lib which provide python like data type) Rustom Mody <rustompmody@gmail.com> - 2015-01-30 10:02 -0800
                Re: RAII vs gc (was fortran lib which provide python like data type) Sturla Molden <sturla.molden@gmail.com> - 2015-01-30 21:28 +0000
                Re: RAII vs gc (was fortran lib which provide python like data type) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-01 14:00 +1100
                Re: RAII vs gc (was fortran lib which provide python like data type) Chris Angelico <rosuav@gmail.com> - 2015-02-01 14:21 +1100
                Re: RAII vs gc (was fortran lib which provide python like data type) Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-01-31 19:27 -0800
              Re: [OT] fortran lib which provide python like data type Michael Torrie <torriem@gmail.com> - 2015-01-30 11:15 -0700
                Re: [OT] fortran lib which provide python like data type Paul Rubin <no.email@nospam.invalid> - 2015-01-30 10:23 -0800
                Re: [OT] fortran lib which provide python like data type Christian Gollwitzer <auriocus@gmx.de> - 2015-01-31 09:27 +0100
                Re: [OT] fortran lib which provide python like data type Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-01-31 11:51 +1300
                Re: [OT] fortran lib which provide python like data type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-31 10:49 +1100
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-01-31 14:22 +0200
                Re: [OT] fortran lib which provide python like data type Rustom Mody <rustompmody@gmail.com> - 2015-01-31 07:50 -0800
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-01-31 19:43 +0200
                Re: [OT] fortran lib which provide python like data type Rustom Mody <rustompmody@gmail.com> - 2015-01-31 18:30 -0800
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-02-01 09:38 +0200
                Re: [OT] fortran lib which provide python like data type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-02 03:49 +1100
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-02-01 20:57 +0200
                Re: [OT] fortran lib which provide python like data type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-02 12:59 +1100
                Re: [OT] fortran lib which provide python like data type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-02 13:05 +1100
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-02-02 10:51 +0200
                Re: [OT] fortran lib which provide python like data type Chris Angelico <rosuav@gmail.com> - 2015-02-02 13:04 +1100
                Re: [OT] fortran lib which provide python like data type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-02 18:01 +1100
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-02-02 10:52 +0200
                Re: [OT] fortran lib which provide python like data type Paul Rudin <paul.nospam@rudin.co.uk> - 2015-02-02 12:56 +0000
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-02-02 15:27 +0200
                Re: [OT] fortran lib which provide python like data type Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-02 16:08 +0000
                Re: [OT] fortran lib which provide python like data type Rustom Mody <rustompmody@gmail.com> - 2015-02-02 08:21 -0800
                Re: [OT] fortran lib which provide python like data type Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-02 16:52 +0000
                Re: [OT] fortran lib which provide python like data type Chris Angelico <rosuav@gmail.com> - 2015-02-03 04:25 +1100
                Re: [OT] fortran lib which provide python like data type Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-02 18:34 +0000
                Re: [OT] fortran lib which provide python like data type Chris Angelico <rosuav@gmail.com> - 2015-02-03 10:15 +1100
                Re: [OT] fortran lib which provide python like data type Matthew Barnett <auxlang@mrabarnett.plus.com> - 2015-02-02 02:35 +0000
                Re: [OT] fortran lib which provide python like data type Chris Angelico <rosuav@gmail.com> - 2015-02-02 13:45 +1100
                Re: [OT] fortran lib which provide python like data type Roy Smith <roy@panix.com> - 2015-02-01 23:12 -0500
                Re: [OT] fortran lib which provide python like data type Roy Smith <roy@panix.com> - 2015-02-01 23:14 -0500
                Re: [OT] fortran lib which provide python like data type Chris Angelico <rosuav@gmail.com> - 2015-02-02 15:47 +1100
                Re: [OT] fortran lib which provide python like data type Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-02 16:06 +0000
                Re: [OT] fortran lib which provide python like data type Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-31 17:59 +0000
                Re: [OT] fortran lib which provide python like data type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-01 13:27 +1100
                Re: [OT] fortran lib which provide python like data type Paul Rubin <no.email@nospam.invalid> - 2015-01-31 22:26 -0800
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-02-01 09:58 +0200
                Re: [OT] fortran lib which provide python like data type Christian Gollwitzer <auriocus@gmx.de> - 2015-02-01 09:14 +0100
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-02-01 21:12 +0200
                Re: [OT] fortran lib which provide python like data type Michael Torrie <torriem@gmail.com> - 2015-02-01 17:50 -0700
                Re: [OT] fortran lib which provide python like data type Michael Torrie <torriem@gmail.com> - 2015-02-01 18:02 -0700
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-02-02 09:39 +0200
                Re: [OT] fortran lib which provide python like data type Michael Torrie <torriem@gmail.com> - 2015-02-02 09:25 -0700
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-02-02 19:57 +0200
                Re: [OT] fortran lib which provide python like data type Michael Torrie <torriem@gmail.com> - 2015-02-02 11:23 -0700
                Re: [OT] fortran lib which provide python like data type Marko Rauhamaa <marko@pacujo.net> - 2015-02-02 20:54 +0200
                Re: [OT] fortran lib which provide python like data type Michael Torrie <torriem@gmail.com> - 2015-02-01 18:02 -0700
                Re: [OT] fortran lib which provide python like data type beliavsky@aol.com - 2015-02-02 05:30 -0800
                Re: [OT] fortran lib which provide python like data type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-31 10:50 +1100
                Re: [OT] fortran lib which provide python like data type Michael Torrie <torriem@gmail.com> - 2015-01-30 20:49 -0700
                Re: [OT] fortran lib which provide python like data type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-31 22:04 +1100
                Re: [OT] fortran lib which provide python like data type Rustom Mody <rustompmody@gmail.com> - 2015-01-31 08:18 -0800
          Re: [OT] fortran lib which provide python like data type Sturla Molden <sturla.molden@gmail.com> - 2015-01-30 23:12 +0000
          Re: [OT] fortran lib which provide python like data type Michael Torrie <torriem@gmail.com> - 2015-01-30 20:35 -0700

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