Re: Ada Core Technologies announces GNATCOM

["David Botton" <David@Botton.com>]

I am not sure I understand how I am confused, although I may very well be.

In the Turbo C version I used (some many years ago) if struct q was large
enough doing

m.a++ in the function as you do below would in fact change the m passed in,
ie. a pass by reference.

ex.

struct q z;
z.a = 5;

clobber (z);

z.a now equals 6 (providing of course that size(q) past the compiler limit
for passing by value/copy).

I even remember a "pragma" that let me play with the minimum size for pass
by copy instead of pass by reference.

Am I missing something? (most likely. If you can explain it to me, it would
be helpful.)

David Botton



>  int clobber (struct q m) {
>      m.a++;
>      return m.a;
>  }
>
>called in c passing a value of the struct type does NOT change
>the value of the passed variable.