Re: A6: Pipes

[Damian Conway]

Michael Lazzaro wrote:

After reading that appendix, I'm still a bit murky on the 
final decisions as to which of these edge cases will be allowed:

         my @out <== (1,2,3);
         my @out <== (my @in = foo());
         my @out <== foo();
         (1,2,3) ==> my @out;
(my @in = foo()) ==> my @out;
           foo() ==> my @out;
These are basically all just two edge-cases. Namely:

        @var <== LIST
and:
        LIST ==> @var
Larry is still leery, but I suspect they will ultimately be allowed.
Mainly because these:
      @in ==> map  {...}
          ==> sort {...}
          ==> map  {...}
          ==> @out;
     @out <== map  {...}
          <== sort {...}
          <== map  {...}
          <== @in;
are much less annoying than:

      @in ==> map  {...}
          ==> sort {...}
          ==> map  {...}
          ==> push @out;
     push @out <== map  {...}
               <== sort {...}
               <== map  {...}
               <== @in;
And because, as I demonstrated, the necessary overloaded multimethods are so 
trivial to implement.

Damian