On Wed, 3 Jul 2024 18:19:35 +0000, Eric Rossman wrote:
>The pointer is not modifiable. The storage to which it points may be.
>
In some languages the *local* pointer passed by value
is modifiable. Example in POSIX (not IBM) C:
#include <stdlib.h>
#include <stdio.h>
int main( int argc, char *argv[] ) {
printf( "Raw: %s\n", argv[ 0 ] );
argv[ 0 ] = realpath( argv[ 0 ], NULL );
printf( "Real: %s\n", argv[ 0 ] );
return( 0 ); }
> ... While some languages might abstract away the actual pointer,
>
Such as Pascal formal parameters qualified VAR.
>________________________________
>From: Paul Gilmartin
>Sent: Wednesday, July 3, 2024 12:07:02 PM
>
>On Wed, 3 Jul 2024 15:48:16 +0000, Eric Rossman wrote:
>
>>>call by value where the value is an address
>>That's the definition of call by reference.
>>
>Not quite. Only in the former case the called routine receives
>a modifiable local copy of that pointer. In the latter, no
>pointer is visible.
--
gil
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
