Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.c++ > #5402
| From | Ian Collins <ian-news@hotmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: Lets put it another way |
| Date | 2011-05-24 22:27 +1200 |
| Message-ID | <941ffpFt2pU22@mid.individual.net> (permalink) |
| References | <bEDCp.16705$Am5.10787@newsfe05.ams2> <940g82Ft2pU20@mid.individual.net> <FLKCp.6980$Ky.4690@newsfe24.ams2> |
On 05/24/11 09:20 PM, Paul wrote:
>
> "Ian Collins"<ian-news@hotmail.com> wrote in message
> news:940g82Ft2pU20@mid.individual.net...
>> On 05/24/11 01:14 PM, Paul wrote:
>>> Ok in connection to my previous post, lets remove the null pointer issue
>>> and
>>> consider this:
>>>
>>> #include<iostream>
>>>
>>> typedef int (*pparr)[3];
>>>
>>> int main(){
>>> pparr p1 = (pparr)new int[3];
>>> pparr p2= p1;
>>> delete[] p1;
>>> std::cout<< *p2<<std::endl;
>>
>> UB yet again.
>>
>>> std::cout<< typeid(*p2).name();
>>> }
>>>
>>>
>>> In the last 2 lines does an array type object exist, even though there is
>>> no
>>> array object?
>>
>> No.
>>
>>> If not what is the object that stores the address and is interpreted as
>>> an
>>> array type by the typeid expression?
>>
>> The typeid and sizeof operators do not evaluate their expression (unless
>> in case of typeid the type is polymorphic). So no object is required.
>>
> You do not seem to understand the question.
You do not appear to understand the answer.
> I said ..if not what is the object that stores the address?
> So what is this object? Do you know?
There isn't an object. The compiler knows the type of *p2. You may as
well have written
#include <iostream>
#include <typeinfo>
typedef int (*pparr)[3];
int main(){
pparr p2;
std::cout << typeid(*p2).name() << std::endl;
}
--
Ian Collins
Back to comp.lang.c++ | Previous | Next — Previous in thread | Next in thread | Find similar
Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-24 02:14 +0100
Re: Lets put it another way Ian Collins <ian-news@hotmail.com> - 2011-05-24 13:33 +1200
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-23 18:39 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-24 10:42 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-24 03:00 -0700
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-24 03:03 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-24 14:54 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-24 13:46 -0700
Re: Lets put it another way Leigh Johnston <leigh@i42.co.uk> - 2011-05-24 21:49 +0100
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-24 23:56 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-24 16:51 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 10:59 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 03:51 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 12:49 +0100
Re: Lets put it another way "Joel C. Salomon" <joelcsalomon@gmail.com> - 2011-05-25 12:32 -0700
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 13:42 -0700
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 13:48 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 21:55 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 13:59 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 22:08 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 14:29 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 22:56 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 15:10 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 23:53 +0100
Re: Lets put it another way "Joel C. Salomon" <joelcsalomon@gmail.com> - 2011-05-25 15:02 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 23:37 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 16:03 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 00:19 +0100
Re: Lets put it another way Leigh Johnston <leigh@i42.co.uk> - 2011-05-26 00:29 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 16:30 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 00:58 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 17:10 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 01:26 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 17:54 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 10:42 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-26 03:06 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 11:25 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-26 03:33 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 12:56 +0100
Re: Lets put it another way Vidar Hasfjord <vattilah-groups@yahoo.co.uk> - 2011-05-25 16:09 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 00:20 +0100
Re: Lets put it another way "Joel C. Salomon" <joelcsalomon@gmail.com> - 2011-05-25 13:56 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 22:18 +0100
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 12:45 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 13:47 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 22:03 +0100
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-24 14:32 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-24 14:16 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 00:00 +0100
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-24 10:20 +0100
Re: Lets put it another way Ian Collins <ian-news@hotmail.com> - 2011-05-24 22:27 +1200
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-24 13:58 +0100
Re: Lets put it another way Ian Collins <ian-news@hotmail.com> - 2011-05-25 07:36 +1200
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-24 21:11 +0100
Re: Lets put it another way Oliver Jackson <chexmofo@hotmail.com> - 2011-05-24 16:04 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 11:27 +0100
Re: Lets put it another way Ian Collins <ian-news@hotmail.com> - 2011-05-25 12:03 +1200
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 11:13 +0100
Re: Lets put it another way Ian Collins <ian-news@hotmail.com> - 2011-05-26 09:19 +1200
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 22:39 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 14:45 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 23:01 +0100
Re: Lets put it another way Leigh Johnston <leigh@i42.co.uk> - 2011-05-25 22:48 +0100
Re: Lets put it another way Ian Collins <ian-news@hotmail.com> - 2011-05-26 09:57 +1200
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 23:09 +0100
Re: Lets put it another way Ian Collins <ian-news@hotmail.com> - 2011-05-26 10:17 +1200
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 23:56 +0100
Re: Lets put it another way Ian Collins <ian-news@hotmail.com> - 2011-05-26 13:04 +1200
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 10:47 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 15:17 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 00:03 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 16:14 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 00:32 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 16:39 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 01:18 +0100
Re: Lets put it another way Joshua Maurice <joshuamaurice@gmail.com> - 2011-05-25 17:52 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 10:53 +0100
Re: Lets put it another way Vidar Hasfjord <vattilah-groups@yahoo.co.uk> - 2011-05-25 15:31 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-25 23:58 +0100
Re: Lets put it another way Vidar Hasfjord <vattilah-groups@yahoo.co.uk> - 2011-05-25 16:54 -0700
Re: Lets put it another way "Paul" <pchristor@yahoo.co.uk> - 2011-05-26 01:00 +0100
csiph-web