On Wed, Apr 16, 2008 at 07:49:48AM -0000, John M. Dlugosz wrote:
> I know how comparisons are chained in Perl 6. There is a very
> short section on it in S03.
>
> So, are the operators infix:{'<'} etc. written in the normal
> way to take two arguments? Then the language transforms
> A op B op C into A op B AND B op C on an innate level. Does
> that apply to any user-defined operator with those names?
It applies to any operator that has 'chain' associativity --
see S06, "Subroutine traits".
> If I want to make my own chained operator, perhaps the
> curvy ≼, ≽, etc. or make my operator ≧
> a synonym for >=, how would I tell the compiler that they
> belong to the same set of chained operators?
sub infix:«≽» ($a, $b) is equiv(&infix:«>=») { ... }
Or, if you want to create your own chained precedence level
separate from the existing relational ops,
sub infix:«≽» ($a, $b) is assoc<chain> is looser(...) { ... }
Pm
