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Re^4: Real private methods using lexical subs in Perl 5.18.

by Arunbear (Parson)
on Jun 01, 2013 at 19:18 UTC ( #1036489=note: print w/ replies, xml ) Need Help??


in reply to Re^3: Real private methods using lexical subs in Perl 5.18.
in thread Real private methods using lexical subs in Perl 5.18.

Yes, there are workarounds available (there's also Sub::Name), but the extra effort involved is one of the reasons I suspect most folks don't use this mechanism for private methods.


Comment on Re^4: Real private methods using lexical subs in Perl 5.18.
Re^5: Real private methods using lexical subs in Perl 5.18.
by LanX (Abbot) on Jun 01, 2013 at 19:59 UTC
    Really? I think most either don't know or prefer avoiding code_refs.

    It's a very special magic which is practically not mentioned in the docs and never in conjunction with the word "private".

    I grepped thru all pods for ->$ and found only 10 occurences from which 8 are only of the string form ->$methname and only 2 with ->$coderef:

    /usr/share/perl/5.10/pod/perlbot.pod: $self->{'delegate'}->$ +AUTOLOAD(@_); /usr/share/perl/5.10/pod/perlfaq7.pod: $widget->$tric +k(); /usr/share/perl/5.10/pod/perlsec.pod: $obj->$method(@args); /usr/share/perl/5.10/pod/perltooc.pod: $self->$methname($newvalue +); /usr/share/perl/5.10/pod/perltooc.pod: $self->$coderef($newvalue) +; /usr/share/perl/5.10/pod/perltoot.pod: return ref_to($c +lass->$methname); /usr/share/perl/5.10/pod/perltoot.pod: return ref_to($c +lass->$methname); /usr/share/perl/5.10/pod/perlunicode.pod: return $sth->$what; /usr/share/perl/5.10/pod/perlunicode.pod: my @arr = $sth->$what +; /usr/share/perl/5.10/pod/perlunicode.pod: my $ret = $sth->$what +;

    the only explanation I found was in perlop

    The Arrow Operator

    ""->"" is an infix dereference operator, just as it is in C and C++. If the right side is either a "...", "{...}", or a "(...)" subscript, then the left side must be either a hard or symbolic reference to an array, a hash, or a subroutine respectively. (Or technically speaking, a location capable of holding a hard reference, if itís an array or hash reference being used for assignment.) See perlreftut and perlref.

    Otherwise, the right side is a method name or a simple scalar variable containing either the method name or a subroutine reference, and the left side must be either an object (a blessed reference) or a class name (that is, a package name). See perlobj.

    Cheers Rolf

    ( addicted to the Perl Programming Language)

      I learned about it from "Programming Perl" 3rd Ed, Chapter 12 ("Objects"), in the section called "Private Methods" (on page 329).

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