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Postings from March 2005
Larry Wall <larry@wall.org> writes:
> I've been thinking about this in my sleep, and at the moment I think
> I'd rather keep .foo meaning $_.foo, but break the automatic binding
> of the invocant to $_. Instead of that, I'd like to see a really,
> really short alias for $self. Suppose we pick "o" for that, short
> for "object". Then we get self calls of the form:
>
> o.frobme(...)
I really, really don't want to see .foo meaning anything but $_.foo, so how
about arranging things so that the invocant becomes $_ iff you don't give it a
name. So:
method whatever {
# $_ is whatever's invocant
}
method whosit ($self:) {
# $_ is unbound, so:
.this # fails
...
}
Note that this would also work for mappy things with pointy subs used to name
arguments.
method whatever {
map { .this } .list_of_contents; # Works, but is weird...
map -> $x { .do_something_with($x.result) } # .do_something uses the
# method's invocant.
}
Same applies to given:
method foo {
given .parent -> $p {
... # $_ is foo's invocant
}
given .parent {
... # $_ is the result of calling .parent
}
}
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