note
Anonymous Monk
S01 says "we sure wish so".
<p>
As for it actually happening..
<p>
Perl 6 has drastically different calling conventions than Perl 5, and even now has characters in its standard library functions that are prohibited in Perl 5 ("-"). The only way I see them inter-operating is through some hairy foreign function interface.
Let's take this example from S01:
<code>
use v6;
# ...some Perl 6 code...
{
use v5;
# ...some Perl 5 code...
{
use v6;
# ...more Perl 6 code...
}
}
</code>
How would this work with some real code dropped in:
<code>
use v6;
multi sub foo-bar(Str $a, Str $b) { "str/str" }
multi sub foo-bar(Str $a, Int $b) { "str/int" }
multi sub foo-bar(Str $a, Num $b) { "str/num" }
multi sub foo-bar(Str $a, Array $b) { "str/num" }
{
use v5;
# oh shit, what now? do I:
foo-bar("1", "2"); # syntax error
call_perl6_func("foo-bar", "1", "2"); # calls, but breaks since Perl5 has no types
# Maybe this instead:
call_perl6_func("foo-bar", Perl6cast("Str", "1"), Perl6cast("Str", "2");
{
use v6;
# now how do I call perl 5?
}
}
</code>
That's just the <b>simple</b> case of calling a subroutine. How about the totally incompatible object systems?
<p>
Does someone have a plan for getting this working?
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