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Groups > comp.lang.c > #148341
| Newsgroups | comp.lang.c |
|---|---|
| Date | 2019-12-02 03:31 -0800 |
| References | (9 earlier) <h2ojbdF4cl5U4@mid.individual.net> <86imn38qov.fsf@linuxsc.com> <qrr04v$kp9$1@dont-email.me> <60ad13cb-77eb-4ab1-be74-e730bbdbe6b3@googlegroups.com> <e28d302a-5fb7-4a9e-9686-637394f75dfa@googlegroups.com> |
| Message-ID | <cd80da64-d663-4525-8dfa-1cb48eeb1f65@googlegroups.com> (permalink) |
| Subject | Re: Is this kosher wrt Generic? |
| From | Thiago Adams <thiago.adams@gmail.com> |
On Saturday, November 30, 2019 at 6:16:42 PM UTC-3, Öö Tiib wrote:
> On Friday, 29 November 2019 14:09:10 UTC+2, Thiago Adams wrote:
> > On Friday, November 29, 2019 at 8:41:29 AM UTC-3, David Brown wrote:
> > ...
> > > Thus you can make classes, use RAII for resource control, have
> > > unique_ptr's for memory handling, store data in std::vectors, work with
> > > std::string - all without ever writing or seeing the word "template", or
> > > understanding rvalue references, or getting your head around
> > > "enable_if". Many of C++'s more complex features exist primarily so
> > > that the standard library (and other libraries) can be written, so that
> > > application code writers can get efficient code without having to
> > > understand these complexities.
> >
> > Recently, a beginner colleague of mine call me saying:
> >
> > "Please look at this error..."
> >
> > The error was really big.
> >
> > I don't remember the details, but we had an object used included
> > in some container.
> >
> > Like this:
> >
> > class X {
> > int i;
> > };
> >
> >
> > int main() {
> > std::vector<X> v;
> > X x;
> > v.push_back(x);
> > }
> >
> > and he was adding a new member at X.
> >
> > class Y {int i;};
> >
> > class X {
> > unique_ptr<Y> sp; // <- Like this
> > int i;
> > };
> >
> > Then the program stop to compile.
>
> Makes sense, std::unique_ptr is not copyable (but is movable)
> and so a struct containing it can't be copied (but can be
> moved) into vector.
> Demo: <http://coliru.stacked-crooked.com/a/14ad05993d274ead>
> Other option is to add a copy constructor but then also rest
> of The Five (plus default constructor for X x;) need to be
> added manually to X.
>
> > If you put this example online (which is much smaller than the real
> > case) we have these errors:
>
> True. What you suggest how these errors should be laid out?
>
> I would prefer:
> Who said that you can push_back non-copyable stuff into
> std::vector by value, you morons, like that "v.push_back(x);"?
When push_back was written the copy ctor was ok. The programmer wasn't
a moron.
When a new feature was required, the code needed some changes.
The programmer that is making the change is also correct
because in this case, unique_ptr was a good choice of use.
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Is this kosher wrt Generic? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-11-04 22:55 -0800
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-05 08:12 +0100
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-05 03:52 -0800
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-05 13:12 +0100
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-05 04:24 -0800
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-05 13:33 +0100
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-05 04:57 -0800
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-05 14:08 +0100
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-05 05:21 -0800
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-05 14:27 +0100
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-05 05:42 -0800
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-05 14:51 +0100
Re: Is this kosher wrt Generic? Bart <bc@freeuk.com> - 2019-11-05 14:49 +0000
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-05 15:53 +0100
Re: Is this kosher wrt Generic? Bart <bc@freeuk.com> - 2019-11-05 15:59 +0000
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-05 17:11 +0100
Re: Is this kosher wrt Generic? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-11-05 09:19 -0800
Re: Is this kosher wrt Generic? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-11-05 07:00 -0800
Re: Is this kosher wrt Generic? David Brown <david.brown@hesbynett.no> - 2019-11-05 16:30 +0100
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-05 15:31 +0100
Re: Is this kosher wrt Generic? Ian Collins <ian-news@hotmail.com> - 2019-11-06 10:34 +1300
Re: Is this kosher wrt Generic? Bart <bc@freeuk.com> - 2019-11-05 22:16 +0000
Re: Is this kosher wrt Generic? Ian Collins <ian-news@hotmail.com> - 2019-11-06 11:34 +1300
Re: Is this kosher wrt Generic? Bart <bc@freeuk.com> - 2019-11-05 23:12 +0000
Re: Is this kosher wrt Generic? Ian Collins <ian-news@hotmail.com> - 2019-11-06 12:29 +1300
Re: Is this kosher wrt Generic? David Brown <david.brown@hesbynett.no> - 2019-11-06 10:17 +0100
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-06 10:56 +0100
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-06 10:02 +0100
Re: Is this kosher wrt Generic? Bart <bc@freeuk.com> - 2019-11-06 10:43 +0000
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-06 04:56 -0800
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-06 14:05 +0100
Re: Is this kosher wrt Generic? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-11-08 21:03 -0800
Re: Is this kosher wrt Generic? Ian Collins <ian-news@hotmail.com> - 2019-11-10 08:45 +1300
Re: Is this kosher wrt Generic? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-11-28 16:35 -0800
Re: Is this kosher wrt Generic? David Brown <david.brown@hesbynett.no> - 2019-11-29 12:41 +0100
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-29 04:08 -0800
Re: Is this kosher wrt Generic? Bart <bc@freeuk.com> - 2019-11-29 13:01 +0000
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-29 06:43 -0800
Re: Is this kosher wrt Generic? Bart <bc@freeuk.com> - 2019-11-29 17:31 +0000
Re: Is this kosher wrt Generic? David Brown <david.brown@hesbynett.no> - 2019-11-29 14:31 +0100
Re: Is this kosher wrt Generic? Öö Tiib <ootiib@hot.ee> - 2019-11-30 13:16 -0800
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-12-02 03:31 -0800
Re: Is this kosher wrt Generic? Öö Tiib <ootiib@hot.ee> - 2019-12-02 23:30 -0800
Re: Is this kosher wrt Generic? Ian Collins <ian-news@hotmail.com> - 2019-12-01 12:10 +1300
Re: Is this kosher wrt Generic? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-01-11 09:35 -0800
Re: Is this kosher wrt Generic? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-11-05 22:49 +0000
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-05 05:12 -0800
Re: Is this kosher wrt Generic? Bonita Montero <Bonita.Montero@gmail.com> - 2019-11-05 14:20 +0100
Re: Is this kosher wrt Generic? guinness.tony@gmail.com - 2019-11-05 16:19 -0800
Re: Is this kosher wrt Generic? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-11-06 00:06 -0800
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-05 03:19 -0800
Re: Is this kosher wrt Generic? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-11-05 22:38 -0800
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-06 04:50 -0800
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-06 05:32 -0800
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-06 05:56 -0800
Re: Is this kosher wrt Generic? Bart <bc@freeuk.com> - 2019-11-06 14:26 +0000
Re: Is this kosher wrt Generic? Thiago Adams <thiago.adams@gmail.com> - 2019-11-06 09:04 -0800
Re: Is this kosher wrt Generic? David Brown <david.brown@hesbynett.no> - 2019-11-06 22:45 +0100
Re: Is this kosher wrt Generic? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-11-29 14:35 -0800
Re: Is this kosher wrt Generic? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-11-29 23:23 +0000
Re: Is this kosher wrt Generic? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-11-29 19:08 -0800
Re: Is this kosher wrt Generic? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-11-29 19:12 -0800
Re: Is this kosher wrt Generic? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-11-30 10:44 +0000
Re: Is this kosher wrt Generic? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-11-09 23:21 -0800
Re: Is this kosher wrt Generic? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-11-09 23:22 -0800
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