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Groups > comp.lang.c++ > #80153
| From | "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: A way around _HAS_ITERATOR_DEBUGGING |
| Date | 2021-06-04 13:30 -0700 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <s9e2gp$5bb$1@gioia.aioe.org> (permalink) |
| References | (4 earlier) <s9ar5t$hik$1@dont-email.me> <s9b2se$jrs$1@dont-email.me> <s9de0b$1oe$1@dont-email.me> <s9dkat$j40$1@dont-email.me> <s9dmf9$39b$1@dont-email.me> |
On 6/4/2021 10:04 AM, James Kuyper wrote:
> On 6/4/21 12:28 PM, Paavo Helde wrote:
>> 04.06.2021 17:40 James Kuyper kirjutas:
>>> On 6/3/21 1:18 PM, Paavo Helde wrote:
>>> ...
>>>> So in C++ one just cannot "cancel" &* as the result would be of a wrong
>>>> type.
>>>
>>> It could be the right type if the return type of the relevant
>>> operator&() overload is the same as the iterator type.
>>
>> In general, it cannot be. Imagine:
>>
>> class A {
>> std::vector<A>::iterator operator&() {
>> // magic here???
>> }
>> };
>>
>> An object in C++ does not know if and in which vector it might reside
>> (unless specifically told so, resulting in some pretty convoluted
>> design), and so it cannot construct a correct iterator to itself.
>>
>> Even if it were the "right type" this would not solve the OP's problem
>> as she specifically wanted to get a pointer, not an iterator.
>
> I've never attempted implementing any of the standard containers (not
> because I couldn't, but just to avoid reinventing the wheel), so I might
> be missing some important detail (possibly one introduced by recent
> updates - I'm sill more somewhat shaky in my understanding of some of
> the features introduced after C++ 2003).
I always thought that implementing standard containers in a C++ course
would be fun. The teacher says something like: We are going to implement
several std containers under the namespace std_course. Imvvho, it would
be an interesting and worth while exercise.
> However, it seems to me that it
> should be possible to implement std::vector<T> with the iterator type
> being T*, in which case that wouldn't be a problem. If that's not
> feasible, could you explain what's problematic about it?
>
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A way around _HAS_ITERATOR_DEBUGGING Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-02 14:49 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-06-02 15:07 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-02 15:12 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-06-02 20:27 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING red floyd <myob@its.invalid> - 2021-06-02 14:24 -0700
Re: A way around _HAS_ITERATOR_DEBUGGING Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-03 00:54 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Öö Tiib <ootiib@hot.ee> - 2021-06-02 17:30 -0700
Re: A way around _HAS_ITERATOR_DEBUGGING Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-02 16:46 +0300
Re: A way around _HAS_ITERATOR_DEBUGGING Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-02 16:23 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-02 19:43 +0300
Re: A way around _HAS_ITERATOR_DEBUGGING Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-02 18:57 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-02 21:13 +0300
Re: A way around _HAS_ITERATOR_DEBUGGING James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-06-02 17:23 -0400
Re: A way around _HAS_ITERATOR_DEBUGGING Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-03 00:53 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-03 00:52 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-02 18:59 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Juha Nieminen <nospam@thanks.invalid> - 2021-06-03 09:21 +0000
Re: A way around _HAS_ITERATOR_DEBUGGING Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-03 11:33 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Bo Persson <bo@bo-persson.se> - 2021-06-03 12:17 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-03 12:25 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Juha Nieminen <nospam@thanks.invalid> - 2021-06-03 17:49 +0000
Re: A way around _HAS_ITERATOR_DEBUGGING MrSpook_ujp@3p26kggzpvpn2h.gov.uk - 2021-06-04 07:43 +0000
Re: A way around _HAS_ITERATOR_DEBUGGING James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-06-03 11:06 -0400
Re: A way around _HAS_ITERATOR_DEBUGGING David Brown <david.brown@hesbynett.no> - 2021-06-03 19:07 +0200
Re: A way around _HAS_ITERATOR_DEBUGGING Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-03 20:18 +0300
Re: A way around _HAS_ITERATOR_DEBUGGING Chris Vine <chris@cvine--nospam--.freeserve.co.uk> - 2021-06-04 10:22 +0100
Re: A way around _HAS_ITERATOR_DEBUGGING Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-04 14:19 +0300
Re: A way around _HAS_ITERATOR_DEBUGGING Chris Vine <chris@cvine--nospam--.freeserve.co.uk> - 2021-06-04 13:07 +0100
Re: A way around _HAS_ITERATOR_DEBUGGING James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-06-04 10:40 -0400
Re: A way around _HAS_ITERATOR_DEBUGGING Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-04 19:28 +0300
Re: A way around _HAS_ITERATOR_DEBUGGING James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-06-04 13:04 -0400
Re: A way around _HAS_ITERATOR_DEBUGGING "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-04 13:30 -0700
Re: A way around _HAS_ITERATOR_DEBUGGING MrSpook_6qpp@dggw8.org - 2021-06-05 09:28 +0000
Re: A way around _HAS_ITERATOR_DEBUGGING Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-04 23:45 +0300
Re: A way around _HAS_ITERATOR_DEBUGGING Juha Nieminen <nospam@thanks.invalid> - 2021-06-03 17:52 +0000
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