How do I dynamically redefine imported subroutines?
That's actually quite easy, but say is not being imported; it's not even a subroutine! say is an operator, and use feature 'say'; merely controls whether the compiler recognises it or not. (It always recognises CORE::say, though.)
Some operators can be overridden from within Perl by overriding GLOBAL::CORE::op, and some can't. The following checks whether say can be overridden this way:
>perl -E"say defined(prototype('CORE::say')) ?'yes':'no'"
Its funky syntax doesn't permit it.
say FILEHANDLE LIST
say BLOCK LIST
It could be done using a CallChecker, but that involves dropping to C/XS.
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.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||