Re: ADA Popularity Discussion Request

[Hyman Rosen <hyrosen@mail.com>]

Jean-Pierre Rosen wrote:
 > However, all other OO languages (that I know of) require
> *all* classes to be declared at library level.

Certainly neither C++ nor Java require this. I will occasionally
write the following C++ code, when I'm too lazy to do the right
thing and make a more widely reusable class.

     void some_func()
     {
         extern int some_global_a, some_global_b;
         struct restorer {
             int &sg, oldval;
             restorer(int &var, int newval) : sg(var), oldval(var) { }
             ~restorer() { sg = oldval; }
         };
         restorer rsga(some_global_a, 53);
         restorer rsgb(some_global_b, -1);
         // ...
     }

Java allows you to write "inner classes", even anonymous ones, at
pretty much any point in your code. They are often used to create
tiny class objects which implement an interface, as callbacks for
example. Something like this
     button.setClickCB(new INotify { void notify() { /* stuff */ } });