Suggestion: Change precedence of 'new'

[Jason House]

Robert Fraser Wrote:

> Jason House wrote:
> > Bill Baxter Wrote:
> > 
> >> Robert Fraser wrote:
> >>> Unknown W. Brackets wrote:
> >>>> I think the problem is in supporting this syntax:
> >>>>
> >>>> auto x = new package.module.Class;
> >>> The argument (as far as I can tell) is that it would be supported only 
> >>> if trailing parentheses were supplied, so that expression would have to 
> >>> be written as "new package.module.Class().propertyMethod;".
> >> That makes sense.  So the rule would be that 'new' munches all the 
> >> dot-separated identifiers to its right till it hits something besides a 
> >> dot or an identifier.
> >>
> >> Here's another one from actual D code ported from Java:
> >>
> >>      (new class Runnable {
> >>          public void run() {
> >>              if (canvas.isDisposed()) return;
> >>              render();
> >>              canvas.swapBuffers();
> >>              canvas.getDisplay().timerExec(15, this);
> >>          }
> >>      }).run();
> >>
> >> In Java the parens around that whole mess aren't necessary.
> >>
> >> --bb
> > 
> > 
> > Why would anyone write code like that in D?  First of all a delegate works just as well as a class with one member.  Second, if this is simply run like a blocking function call, why not define a nested function and just call it?  
> >
> > PS: I'm not trying to knock down your feature request.  I just find the example strange.  I'm sure there's more useful examples available and you just picked one at random.
> 
> Okay, how about this (admittedly contrived) example?
> 
> public abstract class A
> {
>      public final int foo()
>      {
>          // do stuff
>          bar();
>          // do more stuff & return something
>      }
> 
>      protected abstract void bar();
> }
> 
> void baz()
> {
>      int k = new class A
>          {
>              protected void bar()
>              {
>                  // ...
>              }
>       }.foo();
> }

Actually, I meant in the context of the original proposal new foo().bar