Bind and alias


Of course I had to look into some way of doing binding in Perl too.

In previous post PWC126 - Minesweeper Game I used a binding to work on a matrix row, like this:

my @row := @field[$ri];

and eventually observed:

I guess that something similar can be done with Perl too… but I’m happy like this!

Of course that last statement was a lie, so I went on to look for it.

The first thing that I looked at is Data::Alias:

Data::Alias - Comprehensive set of aliasing operations

use Data::Alias;
alias @x = @y; # alias @x to @y

Seems spot on! Until I read this in the admittedly excellent documentation:

Perl 5.22 added some support for aliasing to the Perl core. It has a different syntax, and a different set of operations, from that supplied by this module; see “Assigning to References” in perlref. The core’s aliasing facilities are implemented more robustly than this module and are better supported. If you can rely on having a sufficiently recent Perl version, you should prefer to use the core facility rather than use this module. If you are already using this module and are now using a sufficiently recent Perl, you should attempt to migrate to the core facility.

Very well then… I plan on using nothing older than the already-old version v5.24, so let’s skip Data::Alias and move on to the official core way of doing this:

use feature 'refaliasing';
no warnings 'experimental::refaliasing';
\my @row = $field[$ri];

This is the way of doing the binding. Ehr, the aliasing. Whatever.

I’m not talking from a phylosophical standpoint — of course there might be a ton of subtleties where this is different from binding in Raku — but from the point of view of an unsophisticated programmer this is how we can obtain the same result.

Now I’m happy like this! Stay safe and have fun folks!

Comments? Octodon, , GitHub, Reddit, or drop me a line!