Several of these changes look like they are moving more
towards like Ruby and Python today. Some of the automatic
dereferencing things make me wonder whether Larry is toying
with changing Perl's copy-by-value on assignment rule
What do I mean by that?
Well in Perl 5 if you say:
$foo = $bar;
a new value is made of $bar and copied into $foo. If I
$foo .= $baz;
then $foo is modified in place. By contrast in Ruby if
foo = bar;
you copy by reference. So later on if you say:
foo += baz
that expands to:
foo = foo + baz;
and you create a new string and copy a reference of that
to foo. To get the fast in-place modification you have to
foo << baz;
which will also modify bar.
Anyways if Perl changed this basic semantic, here is what
would be affected:
- You save memory.
- Copying data speeds up.
- Incrementally building large strings slows down unless
you provide an operator for it with explicit side-effects.
- Subroutines that expect to change their arguments by
reference would be hard to rewrite from Perl 5 to Perl 6.
Does anyone have any idea what Larry's thinking is on this
issue? Will Perl continue to copy-by-value on assignment?
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
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! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, 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, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||