It looks as if any complex sub-expressions /subroutine calls are evaluated in order, and
variables/references are evaluated last.
That's very astute of you. It's not exactly what's going on, but it's very close.
For simple variables, Perl pushes what is
effectively a reference onto the stack.
But for complex ecpressions, Perl must construct the
new value and push a reference to that instead. So if
$i = 2
, then $i
in the list pushes a
reference to $i
itself, but $i + 0
and pushes a reference to the copy of the 2. If you later change
, the first 2 changes but the second one doesn't.
Your original example works the same way.
This could be considered a bug. It has come up on p5p before,
but I don't remember what the outcome of the discussion was.
Contrary to what chromatic said, it is not a precedence issue.
Precedence only affects parsing, not execution.
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! —
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.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||