On Fri, 15 Sep 2000 08:28:30 -0700 (PDT), Dave Storrs wrote:
> Personally, I like the way it works at the moment; all the subs
>that you want to memoize are up at the top, where they are easy to see.
You have a point.
What I don't like is how the basic module syntax pretty much requires
the function name as a *string* in order to install itself underneath
it. That has every appearance of a hack. (symbolic references)
Memoizing using function references would look a bit better.
My preferred (most compatible) syntax:
use Memoize foo;
sub foo {
...
}
It should complain, at compile ime, if the sub doesn't exist.
Implementation is a problem, because at the time the import sub is
called, the function hasn't been compiled yet.
Current syntax and behaviour:
use Memoize;
memoize "foo";
foo(1);
foo(2);
foo(3);
foo(2);
foo(1);
foo(4);
sub foo {
my $s = shift;
print "Argument = $s\n";
$s * $s
}
-->
Argument = 1
Argument = 2
Argument = 3
Argument = 4
It does what it should do, but as I said, it looks like a hack.
Replace the second line (the memoize statement) with:
memoize foo;
Unquoted string "foo" may clash with future reserved word at test.pl
line 3.
Argument = 1
Argument = 2
Argument = 3
Argument = 4
It still works, but (a), it still treats "foo" as a string, and (b) it
complains (or worse).
Replace that line with:
memoize \&foo;
-->
Argument = 1
Argument = 2
Argument = 3
Argument = 2
Argument = 1
Argument = 4
No complaint, but it doesn't work either.
--
Bart.
