The new ?? and ??? operators

[Arlen Albert Keshabyan]

Stewart Gordon Wrote:

> "Derek Parnell" <derek at psych.ward> wrote in message 
> news:1lomy00la8rsl.1fa6pft3qx480$.dlg at 40tude.net...
> <snip>
> > How would this evaluate in "long hand" code?
> >
> > int a = b() > c() ??? d() >= e() ??? f() != g();
> 
> From what I can make out:
> 
> int a = b() > c();
> if (!a) a = (d() >= e());
> if (!a) a = (f() != g());
> 
> This is slightly simpler than usual because it's an initialiser (and because 
> int.init happens to be 0).  But in the general case where it's being 
> assigned after declaration, you'd need a bit more:
> 
> int temp = b() > c();
> if (!temp) temp = (d() >= e());
> if (!temp) temp = (f() != g());
> if (temp) a = temp;
> 
> Stewart.
> 
> -- 
> My e-mail address is valid but not my primary mailbox.  Please keep replies 
> on the 'group where everybody may benefit. 
> 

int a = b() > c() ??? d() >= e() ??? f() != g();

can be represented like this:

if(b() > c())
   a = b();
else
   if(d() >= e())
      a = d();
   else
      if(f() != g())
         a = f();

OR compiler must optimize it like this:

{
int temp = b();
if(temp > c())
   a = temp;
else
   {
      temp = d();
      if(temp >= e())
         a = temp;
      else
       {
          temp = f();
          if(temp != g())
            a = temp;
       }
   }
}