size and length

[fir]

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?

[Malcolm McLean]

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.

[olcott]

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

[fir]

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

[fir]

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();