Re: An enhancement

From	Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.c
Subject	Re: An enhancement
Date	2018-10-15 15:39 +0100
Organization	A noiseless patient Spider
Message-ID	<87r2grl1f2.fsf@bsb.me.uk> (permalink)
References	(5 earlier) <g2j7shFohs9U1@mid.individual.net> <84bad126-f01d-4c07-82a8-b9b48d8400c3@googlegroups.com> <pq1s6q$63c$2@dont-email.me> <kF_wD.38858$eN2.10948@fx07.am4> <415bef9c-4cf3-477a-820b-2472b7cda243@googlegroups.com>

Show all headers | View raw

Thiago Adams <thiago.adams@gmail.com> writes:
<snip>
> When you have an empty capture [], them the C++ lambda
> can be used as function pointer.
>
> When the capture is not empty the C++ implementation
> corresponds to an object with the operator () 
> and cannot be used as function pointer. It is an anonymous
> object.

Actually the result of a lambda expression is *always* a closure object
(of a unique, unnamed type), but when the capture is empty, the object
has an implicit conversion to a function pointer.

(The std::function class in <functional> allows you to unify the two
kinds of callable value so that algorithms don't need to know if they
are being given a function pointer or a function object.)

-- 
Ben.

Thread

An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-08 15:44 -0700
  Re: An enhancement Ian Collins <ian-news@hotmail.com> - 2018-10-09 11:48 +1300
    Re: An enhancement Spiros Bousbouras <spibou@gmail.com> - 2018-10-08 23:16 +0000
  Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-09 00:30 +0100
    Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-08 17:24 -0700
      Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-09 02:12 +0100
        Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-08 22:42 -0700
          Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-09 14:41 +0100
        Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-09 11:15 +0200
          Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-09 16:09 +0100
            GCC nested functions: deprecated? (Was: An enhancement) gazelle@shell.xmission.com (Kenny McCormack) - 2018-10-09 15:36 +0000
            Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-09 21:01 +0200
        Re: An enhancement Bart <bc@freeuk.com> - 2018-10-09 11:43 +0100
          Re: An enhancement already5chosen@yahoo.com - 2018-10-09 04:08 -0700
            Re: An enhancement Bart <bc@freeuk.com> - 2018-10-09 12:29 +0100
  Re: An enhancement Spiros Bousbouras <spibou@gmail.com> - 2018-10-08 23:37 +0000
    Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-08 17:22 -0700
      Re: An enhancement Ian Collins <ian-news@hotmail.com> - 2018-10-09 13:30 +1300
      Re: An enhancement Spiros Bousbouras <spibou@gmail.com> - 2018-10-09 05:23 +0000
        Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-08 22:50 -0700
        Re: An enhancement Richard Damon <Richard@Damon-Family.org> - 2018-10-09 08:28 -0400
      Re: An enhancement Wouter Verhelst <w@uter.be> - 2018-10-09 14:05 +0200
        C is often used as an "implementation language" for other languages.  (Was: An enhancement) gazelle@shell.xmission.com (Kenny McCormack) - 2018-10-09 13:13 +0000
          Re: C is often used as an "implementation language" for other languages.  (Was: An enhancement) David Brown <david.brown@hesbynett.no> - 2018-10-09 16:51 +0200
        Re: An enhancement Bart <bc@freeuk.com> - 2018-10-09 14:17 +0100
      Re: An enhancement Thiago Adams <thiago.adams@gmail.com> - 2018-10-09 05:20 -0700
        Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-09 11:33 -0700
          Re: An enhancement Thiago Adams <thiago.adams@gmail.com> - 2018-10-09 13:41 -0700
    Re: An enhancement Bart <bc@freeuk.com> - 2018-10-09 12:35 +0100
  Re: An enhancement Wouter Verhelst <w@uter.be> - 2018-10-09 14:04 +0200
    Re: An enhancement Spiros Bousbouras <spibou@gmail.com> - 2018-10-09 12:29 +0000
      Re: An enhancement Wouter Verhelst <w@uter.be> - 2018-10-09 19:50 +0200
      Re: An enhancement queequeg@trust.no1 (Queequeg) - 2018-10-15 09:19 +0000
        Re: An enhancement already5chosen@yahoo.com - 2018-10-15 03:07 -0700
          Re: An enhancement Ian Collins <ian-news@hotmail.com> - 2018-10-15 23:18 +1300
            Re: An enhancement already5chosen@yahoo.com - 2018-10-15 03:39 -0700
              Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-15 13:03 +0200
                Re: An enhancement Bart <bc@freeuk.com> - 2018-10-15 12:15 +0100
                Re: An enhancement Thiago Adams <thiago.adams@gmail.com> - 2018-10-15 05:20 -0700
                Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-15 15:39 +0100
                Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-15 14:36 +0200
                Re: An enhancement Thiago Adams <thiago.adams@gmail.com> - 2018-10-15 05:59 -0700
                Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-15 15:08 +0200
                Re: An enhancement Thiago Adams <thiago.adams@gmail.com> - 2018-10-15 07:25 -0700
                Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-15 15:44 +0100
                Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-15 19:02 -0700
                Re: An enhancement Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-10-16 05:55 +0000
                Re: An enhancement jameskuyper@alumni.caltech.edu - 2018-10-16 05:37 -0700
                Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-16 15:11 +0100
                Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-16 13:33 -0700
                Re: An enhancement David Kleinecke <dkleinecke@gmail.com> - 2018-10-16 21:27 -0700
                Re: An enhancement Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-10-16 14:57 +0100
                Re: An enhancement scott@slp53.sl.home (Scott Lurndal) - 2018-10-16 14:24 +0000
                Re: An enhancement mark.bluemel@gmail.com - 2018-10-16 07:28 -0700
                Re: An enhancement Bart <bc@freeuk.com> - 2018-10-16 15:25 +0100
            Re: An enhancement Bart <bc@freeuk.com> - 2018-10-15 11:44 +0100
              Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-15 13:08 +0200
          Re: An enhancement Bart <bc@freeuk.com> - 2018-10-15 11:22 +0100
            Re: An enhancement David Brown <david.brown@hesbynett.no> - 2018-10-15 13:01 +0200
              Re: An enhancement Nick Bowler <nbowler@draconx.ca> - 2018-10-15 14:43 +0000

csiph-web