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Make it idiot-proof, and someone will breed a better idiot. -- Oliver Elphick

devel / comp.lang.c / Re: size and length

SubjectAuthor
* size and lengthfir
`* Re: size and lengthMalcolm McLean
 +* Re: size and lengtholcott
 |`- Re: size and lengthfir
 `- Re: size and lengthfir

1
size and length

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Subject: size and length
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 by: fir - Sat, 21 May 2022 11:39 UTC

writing dynamic arys i noticed one thing (not even noticed but like
bumped my head on it):

imo the size is probably appriopriate name for axemple on this
what realloc takes this is teh size of ram allocked (for example 1 MB)
-when to know length of such array you need to know the size of
its basic element, for example if this is array of ints the length would
be 256*1024

im not sure if this division of those two separate meanings is official
in computer science, doeas maybe some knows something on it?

Re: size and length

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Subject: Re: size and length
From: malcolm....@gmail.com (Malcolm McLean)
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 by: Malcolm McLean - Mon, 23 May 2022 00:17 UTC

On Saturday, 21 May 2022 at 12:39:30 UTC+1, fir wrote:
> writing dynamic arys i noticed one thing (not even noticed but like
> bumped my head on it):
>
> imo the size is probably appriopriate name for axemple on this
> what realloc takes this is teh size of ram allocked (for example 1 MB)
> -when to know length of such array you need to know the size of
> its basic element, for example if this is array of ints the length would
> be 256*1024
>
> im not sure if this division of those two separate meanings is official
> in computer science, doeas maybe some knows something on it?
>
A lot of languages don't make it easy to determine the number of bytes
used by an array. So there's no convention that "size" represents a
number of bytes whilst "length" represents a number of elements.

If would make sense for C, but the C++ standard template library uses
"szie" for a count, so that ship has sailed.

Re: size and length

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 by: olcott - Mon, 23 May 2022 15:13 UTC

On 5/22/2022 7:17 PM, Malcolm McLean wrote:
> On Saturday, 21 May 2022 at 12:39:30 UTC+1, fir wrote:
>> writing dynamic arys i noticed one thing (not even noticed but like
>> bumped my head on it):
>>
>> imo the size is probably appriopriate name for axemple on this
>> what realloc takes this is teh size of ram allocked (for example 1 MB)
>> -when to know length of such array you need to know the size of
>> its basic element, for example if this is array of ints the length would
>> be 256*1024
>>
>> im not sure if this division of those two separate meanings is official
>> in computer science, doeas maybe some knows something on it?
>>
> A lot of languages don't make it easy to determine the number of bytes
> used by an array. So there's no convention that "size" represents a
> number of bytes whilst "length" represents a number of elements.
>
> If would make sense for C, but the C++ standard template library uses
> "szie" for a count, so that ship has sailed.

std::vector<int> array;
int bytes = sizeof(int) * array.size();
That makes the most sense to me.

--
Copyright 2022 Pete Olcott

"Talent hits a target no one else can hit;
Genius hits a target no one else can see."
Arthur Schopenhauer

Re: size and length

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Subject: Re: size and length
From: profesor...@gmail.com (fir)
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 by: fir - Mon, 23 May 2022 15:15 UTC

poniedziałek, 23 maja 2022 o 02:17:26 UTC+2 Malcolm McLean napisał(a):
> On Saturday, 21 May 2022 at 12:39:30 UTC+1, fir wrote:
> > writing dynamic arys i noticed one thing (not even noticed but like
> > bumped my head on it):
> >
> > imo the size is probably appriopriate name for axemple on this
> > what realloc takes this is teh size of ram allocked (for example 1 MB)
> > -when to know length of such array you need to know the size of
> > its basic element, for example if this is array of ints the length would
> > be 256*1024
> >
> > im not sure if this division of those two separate meanings is official
> > in computer science, doeas maybe some knows something on it?
> >
> A lot of languages don't make it easy to determine the number of bytes
> used by an array. So there's no convention that "size" represents a
> number of bytes whilst "length" represents a number of elements.
>
> If would make sense for C, but the C++ standard template library uses
> "szie" for a count, so that ship has sailed.

i wouldnt say it sailed .. but if there us as you say it may mean people dont notice
the difference and this difference possibly should be noticed more wide

Re: size and length

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Subject: Re: size and length
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 by: fir - Mon, 23 May 2022 15:18 UTC

poniedziałek, 23 maja 2022 o 17:13:26 UTC+2 olcott napisał(a):
> On 5/22/2022 7:17 PM, Malcolm McLean wrote:
> > On Saturday, 21 May 2022 at 12:39:30 UTC+1, fir wrote:
> >> writing dynamic arys i noticed one thing (not even noticed but like
> >> bumped my head on it):
> >>
> >> imo the size is probably appriopriate name for axemple on this
> >> what realloc takes this is teh size of ram allocked (for example 1 MB)
> >> -when to know length of such array you need to know the size of
> >> its basic element, for example if this is array of ints the length would
> >> be 256*1024
> >>
> >> im not sure if this division of those two separate meanings is official
> >> in computer science, doeas maybe some knows something on it?
> >>
> > A lot of languages don't make it easy to determine the number of bytes
> > used by an array. So there's no convention that "size" represents a
> > number of bytes whilst "length" represents a number of elements.
> >
> > If would make sense for C, but the C++ standard template library uses
> > "szie" for a count, so that ship has sailed.
> std::vector<int> array;
> int bytes = sizeof(int) * array.size();
> That makes the most sense to me.
>
for me its nonsense (in te context said) should be > int bytes = sizeof(array[0]) * array.length();

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