Re: size_t best practice

Andrey Tarasevich <andreytarasevich@hotmail.com> writes:

On 08/20/24 6:55 AM, Andrey Tarasevich wrote:
>

On 08/20/24 6:53 AM, Andrey Tarasevich wrote:
>

For example, iteration all the way to 0 can be idiomatically
implemented as
>
 for (some_unsigned_type i = size; (some_unsigned_type) i != -1; --i)
 ...

>
Sorry, a typo.  Was meant to be
>
  for (some_unsigned_type i = size; i != (some_unsigned_type) -1; --i)
  ...

>
Of, crap.  One more time
>
  for (some_unsigned_type i = size - 1;
       i != (some_unsigned_type) -1;
       --i)
    ...
>
Should be good now :)

To me the redundant cast is a red flag.  A cleaner alternative:

   for( some_unsigned_type i = size;  i > 0 && i--;  ){
      ...
   }

Produces identical code to the above at -O1 (both gcc and clang).