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Groups > comp.lang.c > #105665

Re: lambda functions in C

From BartC <bc@freeuk.com>
Newsgroups comp.lang.c
Subject Re: lambda functions in C
Date 2017-03-09 14:20 +0000
Organization A noiseless patient Spider
Message-ID <o9ro6m$lpr$1@dont-email.me> (permalink)
References <da2ac707-2a39-41c2-9ac4-20c4811318e8@googlegroups.com> <0ce4976f-49e7-4275-9371-dadbe4388539@googlegroups.com> <87pohrz687.fsf@bsb.me.uk> <19420eaf-1737-4ef0-915e-07ba9ce59160@googlegroups.com>

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On 09/03/2017 13:03, Malcolm McLean wrote:
> On Wednesday, March 8, 2017 at 11:41:51 PM UTC, Ben Bacarisse wrote:
>> Malcolm McLean <malcolm.mclean5@btinternet.com> writes:
>>
>>> The rule is to always pass back a context pointer to the callback.
>>
>> That's usually implemented as a standard, named function whereas a
>> lambda is an anonymous function.
>>
>> A closure is a function value that carries with it some lexical
>> environment, usually the one it was defined or created in.  A named C
>> function with a void * parameter is often used in an attempt to model
>> the behaviour of a closure but it does not come very close as the
>> argument that gets passed is chosen by the caller and has almost nothing
>> to do with the names in scope where the function is defined.
>>
>> It's even further from being a lambda since it lacks the key property of
>> being anonymous.
>>
> No, the key property is assignability.
>
> If we bind a function by name, so the symbol sqrt() means "take the square root using
> this code", then sqrt is not a lambda. If we add a layer of indirection, we're no longer
> binding by name, we have a lambda. it's anonymous and reassignable, even if the
> pointer to it has a name.

By that definition, all functions in Python are lambdas. Because the 
name of any function is a binding that can easily be reassigned (leaving 
the function inaccessible if you're not careful).

-- 
bartc

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lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-08 10:04 -0800
  Re: lambda functions in C BartC <bc@freeuk.com> - 2017-03-08 18:20 +0000
    Re: lambda functions in C Chad <cdalten@gmail.com> - 2017-03-08 11:12 -0800
      Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-08 11:36 -0800
        Re: lambda functions in C scott@slp53.sl.home (Scott Lurndal) - 2017-03-08 20:43 +0000
        Re: lambda functions in C David Brown <david.brown@hesbynett.no> - 2017-03-08 21:55 +0100
          Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-08 13:18 -0800
            Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-10 12:44 -0800
        Re: lambda functions in C Chad <cdalten@gmail.com> - 2017-03-08 13:03 -0800
    Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-08 11:33 -0800
      Re: lambda functions in C scott@slp53.sl.home (Scott Lurndal) - 2017-03-08 20:46 +0000
        Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-08 13:25 -0800
      Re: lambda functions in C "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-03-10 13:55 -0500
        Re: lambda functions in C supercat@casperkitty.com - 2017-03-10 11:09 -0800
          Re: lambda functions in C "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-03-10 14:51 -0500
        Re: lambda functions in C BartC <bc@freeuk.com> - 2017-03-10 19:19 +0000
          Re: lambda functions in C "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-03-10 14:53 -0500
            Re: lambda functions in C BartC <bc@freeuk.com> - 2017-03-11 14:17 +0000
              Re: lambda functions in C "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-03-11 06:55 -0800
                Re: lambda functions in C "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-03-11 07:05 -0800
  Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-08 13:55 -0800
    Re: lambda functions in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-03-08 23:41 +0000
      Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-09 05:03 -0800
        Re: lambda functions in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-03-09 14:06 +0000
        Re: lambda functions in C BartC <bc@freeuk.com> - 2017-03-09 14:20 +0000
          Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-09 08:07 -0800
            Re: lambda functions in C David Brown <david.brown@hesbynett.no> - 2017-03-09 21:50 +0100
              Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-09 23:38 +0100
                Re: lambda functions in C Ike Naar <ike@iceland.freeshell.org> - 2017-03-09 22:46 +0000
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-10 08:39 +0100
                Re: lambda functions in C Ike Naar <ike@iceland.freeshell.org> - 2017-03-10 08:03 +0000
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-10 09:22 +0100
                Re: lambda functions in C Ike Naar <ike@iceland.freeshell.org> - 2017-03-10 19:24 +0000
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-10 23:23 +0100
                Re: lambda functions in C Ike Naar <ike@iceland.freeshell.org> - 2017-03-11 18:02 +0000
                Re: lambda functions in C Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-09 20:48 -0500
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-10 08:57 +0100
                Re: lambda functions in C Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-10 11:26 -0500
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-10 17:53 +0100
                Re: lambda functions in C Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-10 13:17 -0500
                Re: lambda functions in C David Brown <david.brown@hesbynett.no> - 2017-03-11 17:11 +0100
                Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-10 00:38 -0800
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-10 10:23 +0100
                Re: lambda functions in C Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-10 11:37 -0500
                Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-10 09:07 -0800
                Re: lambda functions in C Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-10 13:22 -0500
                Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-10 10:47 -0800
                Re: lambda functions in C Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-10 14:57 -0500
                Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-10 12:26 -0800
                Re: lambda functions in C Chad <cdalten@gmail.com> - 2017-03-10 12:49 -0800
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-10 23:32 +0100
                Re: lambda functions in C Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-11 12:26 -0500
                Re: lambda functions in C David Brown <david.brown@hesbynett.no> - 2017-03-11 17:17 +0100
                Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-11 10:26 -0800
                Re: lambda functions in C David Brown <david.brown@hesbynett.no> - 2017-03-11 19:48 +0100
                Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-11 12:02 -0800
                Re: lambda functions in C Ian Collins <ian-news@hotmail.com> - 2017-03-12 09:14 +1300
                Re: lambda functions in C "James R. Kuyper" <jameskuyper@verizon.net> - 2017-03-11 15:44 -0500
                Re: lambda functions in C Ian Collins <ian-news@hotmail.com> - 2017-03-12 09:51 +1300
                Re: lambda functions in C "James R. Kuyper" <jameskuyper@verizon.net> - 2017-03-11 16:11 -0500
                Re: lambda functions in C jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-11 22:21 +0100
                Re: lambda functions in C jameskuyper@verizon.net - 2017-03-11 13:36 -0800
                Re: lambda functions in C jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-11 23:48 +0100
                Re: lambda functions in C Ian Collins <ian-news@hotmail.com> - 2017-03-12 11:55 +1300
                Re: lambda functions in C "James R. Kuyper" <jameskuyper@verizon.net> - 2017-03-11 18:34 -0500
                Re: lambda functions in C Ian Collins <ian-news@hotmail.com> - 2017-03-12 15:23 +1300
                Re: lambda functions in C BartC <bc@freeuk.com> - 2017-03-12 11:42 +0000
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-12 13:49 +0100
                Re: lambda functions in C "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-03-12 10:56 -0700
                Re: lambda functions in C jameskuyper@verizon.net - 2017-03-11 15:30 -0800
                Re: lambda functions in C jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-12 00:37 +0100
                Re: lambda functions in C Keith Thompson <kst-u@mib.org> - 2017-03-11 17:23 -0800
                Re: lambda functions in C David Brown <david.brown@hesbynett.no> - 2017-03-12 14:32 +0100
                Re: lambda functions in C Gareth Owen <gwowen@gmail.com> - 2017-03-12 07:22 +0000
                Re: lambda functions in C Ian Collins <ian-news@hotmail.com> - 2017-03-12 11:10 +1300
                Re: lambda functions in C Ian Collins <ian-news@hotmail.com> - 2017-03-12 11:08 +1300
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-12 00:17 +0100
                Re: lambda functions in C David Brown <david.brown@hesbynett.no> - 2017-03-12 14:14 +0100
                Re: lambda functions in C Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-12 09:54 -0400
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-12 15:10 +0100
                Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-12 08:08 -0700
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-12 16:49 +0100
                Re: lambda functions in C Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-12 14:28 -0400
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-13 00:03 +0100
                Re: lambda functions in C Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-12 19:15 -0400
                Re: lambda functions in C David Brown <david.brown@hesbynett.no> - 2017-03-12 18:18 +0100
                Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-12 10:42 -0700
                Re: lambda functions in C David Brown <david.brown@hesbynett.no> - 2017-03-12 20:53 +0100
                Re: lambda functions in C supercat@casperkitty.com - 2017-03-10 07:09 -0800
                Re: lambda functions in C supercat@casperkitty.com - 2017-03-10 08:56 -0800
                Re: lambda functions in C GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-10 08:49 +0100
    Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-09 04:12 -0800
  Re: lambda functions in C Alain Ketterlin <alain@universite-de-strasbourg.fr.invalid> - 2017-03-09 10:38 +0100
  Re: lambda functions in C Siri Cruise <chine.bleu@yahoo.com> - 2017-03-09 08:48 -0800
    Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-09 09:45 -0800
      Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-09 09:51 -0800
    Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-09 09:50 -0800
      Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-09 11:08 -0800
        Re: lambda functions in C Ian Collins <ian-news@hotmail.com> - 2017-03-10 08:22 +1300
          Re: lambda functions in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-09 12:12 -0800
        Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-09 11:29 -0800
      Re: lambda functions in C Siri Cruise <chine.bleu@yahoo.com> - 2017-03-09 13:33 -0800
        Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-09 13:42 -0800
          Re: lambda functions in C Ian Collins <ian-news@hotmail.com> - 2017-03-10 11:02 +1300
          Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-09 14:30 -0800
          Re: lambda functions in C Siri Cruise <chine.bleu@yahoo.com> - 2017-03-09 15:07 -0800
  Re: lambda functions in C jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-11 21:45 +0100
    Re: lambda functions in C Thiago Adams <thiago.adams@gmail.com> - 2017-03-13 06:13 -0700

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