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devel / comp.lang.c++ / Re: How to convert a pointer inside a vector back to an iterator ?

SubjectAuthor
* How to convert a pointer inside a vector back to an iterator ?Bonita Montero
`* Re: How to convert a pointer inside a vector back to an iterator ?Alf P. Steinbach
 `- Re: How to convert a pointer inside a vector back to an iterator ?Bonita Montero

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How to convert a pointer inside a vector back to an iterator ?

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From: Bonita.M...@gmail.com (Bonita Montero)
Newsgroups: comp.lang.c++
Subject: How to convert a pointer inside a vector back to an iterator ?
Date: Fri, 18 Aug 2023 13:45:00 +0200
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 by: Bonita Montero - Fri, 18 Aug 2023 11:45 UTC

How can I convert a pointer inside a vector back to an iterator
so that the operation is fully optimized away ? I try to use
iterators as most as possible to have iterator debugging, but
sometimes I've to work togehter with iterator debugging.

Re: How to convert a pointer inside a vector back to an iterator ?

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From: alf.p.st...@gmail.com (Alf P. Steinbach)
Newsgroups: comp.lang.c++
Subject: Re: How to convert a pointer inside a vector back to an iterator ?
Date: Fri, 18 Aug 2023 20:02:36 +0200
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 by: Alf P. Steinbach - Fri, 18 Aug 2023 18:02 UTC

On 2023-08-18 1:45 PM, Bonita Montero wrote:
> How can I convert a pointer inside a vector back to an iterator
> so that the operation is fully optimized away ? I try to use
> iterators as most as possible to have iterator debugging, but
> sometimes I've to work togehter with iterator debugging.

Don't know about "fully optimized away".

But otherwise, `v.begin() + (p - v.data())`.

- Alf

Re: How to convert a pointer inside a vector back to an iterator ?

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From: Bonita.M...@gmail.com (Bonita Montero)
Newsgroups: comp.lang.c++
Subject: Re: How to convert a pointer inside a vector back to an iterator ?
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 by: Bonita Montero - Fri, 18 Aug 2023 20:05 UTC

Am 18.08.2023 um 20:02 schrieb Alf P. Steinbach:
> On 2023-08-18 1:45 PM, Bonita Montero wrote:
>> How can I convert a pointer inside a vector back to an iterator
>> so that the operation is fully optimized away ? I try to use
>> iterators as most as possible to have iterator debugging, but
>> sometimes I've to work togehter with iterator debugging.
>
> Don't know about "fully optimized away".
>
> But otherwise, `v.begin() + (p - v.data())`.

If the pointer is inside a register that's optimized away and
the register is considered to be the iterator object afterwards.,


devel / comp.lang.c++ / Re: How to convert a pointer inside a vector back to an iterator ?

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