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Groups > comp.lang.c++ > #120349
| From | Michael S <already5chosen@yahoo.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: thread about the pros and cons of lambdas, but more about cons |
| Date | 2024-09-26 11:17 +0300 |
| Organization | A noiseless patient Spider |
| Message-ID | <20240926111705.00004d91@yahoo.com> (permalink) |
| References | <20240925195423.00007ecc@yahoo.com> <vd1poc$3q40f$2@dont-email.me> <20240925233008.000063f7@yahoo.com> <vd1ts5$3r06g$1@dont-email.me> |
On Thu, 26 Sep 2024 00:04:03 +0300
Paavo Helde <eesnimi@osa.pri.ee> wrote:
> On 25.09.2024 23:30, Michael S wrote:
> > On Wed, 25 Sep 2024 22:53:47 +0300
> > Paavo Helde <eesnimi@osa.pri.ee> wrote:
> >
> >>
> >> This is called a strawman argument. You invent an example where the
> >> lambda does not really suit and is slower than an alternative, then
> >> attack it.
> >>
> >> Solution is simple: use lambdas where they fit.
> >>
> >
> > Can you give me one reason why writing recursive lambdas in C++ can
> > not be streight-forward?
> > That's how lambda-base recursive code that is 100% equivalent of
> > above C++ looks in Go. Simpler, isn't it?
> >
> > var ff4 func(x, y uintptr)
> > ff4 = func(x, y uintptr) {
> > if x >= w || y >= h {
> > return
> > }
> > if img[w*y+x] != target {
> > return
> > }
> > img[w*y+x] = dest
> > ff4(x-1, y)
> > ff4(x+1, y)
> > ff4(x, y-1)
> > ff4(x, y+1)
> > }
>
> Looks simpler, but not sure it actually is, given that access to the
> "outer" variables seems to be not encapsulated or controlled in any
> way.
Correct. Go does has no fine access control that is available in C++.
Any lambda in Go has access to all variables at scope of its
declaration/definition.
> Probably this is an equivalent to a C++ free function with
> global or thread-local variables, not to a C++ lambda.
>
That's incorrect.
Lambda in Go is less controlled than in C++, but it is not less
powerful. More like more powerful.
According to my understanding, in Go one can pass lambda to goroutine
(which is more similar to C++ thread than to C++ coroutine) then exit
the calling function and things will still work as naively expected.
I don't believe that you can do it in C++, or, at least you can't do it
if your lambda has captures accessed by reference.
Pay attention, I didn't try it, just skimmed docs, so I could be wrong.
>
> There are many things in C++ which I do not like and many things
> which I'm sure could work better. However, my task as a software
> engineer is to make the best use of the tools which I have got. With
> C++ this means avoiding use or misuse of very many of its features.
>
Of course, I agree with that. Where I disagree is that IMO in case of
lambdas almost every use carries at least a seed of misuse So, on
balance, C++ language would have been better without them.
Back to comp.lang.c++ | Previous | Next — Previous in thread | Next in thread | Find similar
thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-25 19:54 +0300
Re: thread about the pros and cons of lambdas, but more about cons Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-25 19:17 +0200
Re: thread about the pros and cons of lambdas, but more about cons Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-25 19:55 +0200
Re: thread about the pros and cons of lambdas, but more about cons Paavo Helde <eesnimi@osa.pri.ee> - 2024-09-25 22:53 +0300
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-25 23:30 +0300
Re: thread about the pros and cons of lambdas, but more about cons Paavo Helde <eesnimi@osa.pri.ee> - 2024-09-26 00:04 +0300
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-26 11:17 +0300
Re: thread about the pros and cons of lambdas, but more about cons Paavo Helde <eesnimi@osa.pri.ee> - 2024-09-26 11:25 +0300
Re: thread about the pros and cons of lambdas, but more about cons Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-26 10:28 +0200
Re: thread about the pros and cons of lambdas, but more about cons Paavo Helde <eesnimi@osa.pri.ee> - 2024-09-26 11:49 +0300
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-26 11:38 +0300
Re: thread about the pros and cons of lambdas, but more about cons Ben Bacarisse <ben@bsb.me.uk> - 2024-09-25 23:13 +0100
Re: thread about the pros and cons of lambdas, but more about cons Ben Bacarisse <ben@bsb.me.uk> - 2024-09-25 23:28 +0100
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-26 10:41 +0300
Re: thread about the pros and cons of lambdas, but more about cons David Brown <david.brown@hesbynett.no> - 2024-09-26 10:29 +0200
Re: thread about the pros and cons of lambdas, but more about cons Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-26 11:35 +0200
Re: thread about the pros and cons of lambdas, but more about cons David Brown <david.brown@hesbynett.no> - 2024-09-26 13:27 +0200
Re: thread about the pros and cons of lambdas, but more about cons Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-26 13:31 +0200
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-26 15:25 +0300
Re: thread about the pros and cons of lambdas, but more about cons Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-26 14:58 +0200
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-26 16:53 +0300
Re: thread about the pros and cons of lambdas, but more about cons Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-26 15:54 +0200
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-27 16:55 +0300
Re: thread about the pros and cons of lambdas, but more about cons Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-09-26 10:01 -0700
Re: thread about the pros and cons of lambdas, but more about cons Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-26 19:04 +0200
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-26 20:20 +0300
Re: thread about the pros and cons of lambdas, but more about cons Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-09-26 10:38 -0700
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-27 16:27 +0300
Re: thread about the pros and cons of lambdas, but more about cons Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-09-28 04:06 -0700
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-26 10:58 +0300
Re: thread about the pros and cons of lambdas, but more about cons Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-09-26 10:27 -0700
Re: thread about the pros and cons of lambdas, but more about cons Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-26 19:32 +0200
Re: thread about the pros and cons of lambdas, but more about cons Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-09-26 14:09 -0700
Re: thread about the pros and cons of lambdas, but more about cons Michael S <already5chosen@yahoo.com> - 2024-09-27 16:15 +0300
Re: thread about the pros and cons of lambdas, but more about cons Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-09-28 04:25 -0700
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