G'Day Rowan,
 
-=> Quoting Rowan Crowe to Frank Adam <=-
 RC> * Frank Adam writes to All, on Saturday August 17 1996
 RC> at 04:57:
 
 FA> Does passing a pointer to a function effect performance, as opposed to
 FA> having the contents of said pointer global or local ?
 RC> Don't quite understand this one. Do you mean storing the 
 RC> return value in a global variable?
No, here is an example..


struct strct
{
 int x,y,z;
 };

struct strct s;  

int myfunc();
int myfunc2(struct strct *s);

main()
{
 myfunc();
 myfunc2(&s);
 return 0;
 } 

Assume both function do the same according to s, would there be a notable 
speed difference ? Especially in a library, where a number of functions 
would take s as a control parameter.
I'm in the process of making up a library, that may have more than one 
copies running at any time. If i do it in C i'll have to have a number of 
instances of the struct and pass it to the functions.
If i find that it slows execution too much i may have to opt for C++ and 
classes, but being a library speed diffs may not really show up until it's 
used in a "real" application. 

 RC> Re-entrancy means you can call the procedure while it's
 RC> already in the middle of being executed, without clobbering 
 RC> all your variables. Some things such as sorts and 
So i was roughly on the right track, comparing it to multiple instances.


  L8r Frank (fadam{at}ozemail.com.au).
  
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