Honestly I wouldn't have implemented it your way in order to have a higher degree of reusability and readability.

For instance

• using a callback instead of arr_alias would allow a version to return copies which pass your first test criteria.
• the nested maps could be abstracted to slice arbitrary nested structures, not only matrices.
• allowing different projections, not only ranges

OTOH I tend to get lost in abstraction. .. ;)

> Of course, @_!

It's a hack I once learned from Ikegami++, but it seems to be reliable.

Though not many people know if it depends on an implementation detail.

And unfortunately I don't think it can be used to alias hashes (i.e. values) too.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.