I didn’t mention Sub::Install in the “Dynamic Subroutines” (or maybe the Symbol Table chapter. It was worth a mention (but only that). I show readers how to define subroutines in other packages (or even the current one, I guess) by assigning to a type glob: Continue reading “Sub::Install has a nice interface”
Category: Dynamic Subroutines
Naming anonymous subroutines
In the “Dynamic Subroutines” chapter, I considered adding the undocumented __ANON__ trick to give anonymous subroutines names. ysth described this in Permonks in 2003 in Named anonymous subs and later showed up in Perl Hacks #57. Although it’s undocumented, several modules use the trick. Continue reading “Naming anonymous subroutines”
New to “Dynamic Subroutines”
“Dynamic Subroutines” is one of my favorite chapters in Mastering Perl, although it’s not a long one. When Allison Randal and I were first planning the book, we didn’t want to cover anything that was already done well in another book. Since Mark Jason Dominus had already exhausted the subject in Higher-Order Perl
Not much has changed in Perl in this regard, although Perl v5.16 added the __SUB__ token so we can reference the current subroutine even if we don’t know its name.
Check out this chapter in O’Reilly Atlas.