The following module was proposed for inclusion in the Module List:
modid: Attribute::Util
DSLIP: RdpOp
description: A selection of general-utility attributes
userid: MARCEL (Marcel Grunauer)
chapterid: 2 (Perl_Core_Modules)
communities:
comp.lang.perl.modules, vienna.pm list, london.pm list
similar:
Attribute::Handler Attribute::Memoize Attribute::Abstract Memoize
rationale:
This module provides four universally accessible attributes of
general interest:
Memoize This attribute makes it slightly easier (and modern) to
memoize a function by providing an attribute, `:Memoize' that makes
it unnecessary for you to explicitly call `Memoize::memoize()'.
Options can be passed via the attribute per usual (see the
`Attribute::Handlers' manpage for details, and the `Memoize' manpage
for information on memoizing options):
sub f :Memoize(NORMALIZER => 'main::normalize_f') {...}
However, since the call to `memoize()' is now done in a different
package, it is necessary to include the package name in any function
names passed as options to the attribute, as shown above.
Abstract
Declaring a subroutine to be abstract using this attribute causes a
call to it to die with a suitable exception. Subclasses are expected
to implement the abstract method. Using the attribute makes it
visually distinctive that a method is abstract, as opposed to
declaring it without any attribute or method body, or providing a
method body that might make it look as though it was implemented
after all.
Alias
If you need a variable or subroutine to be known by another name,
use this attribute. Internally, the attribute's handler assigns
typeglobs to each other. As such, the `Alias' attribute provides a
layer of abstraction. If the underlying mechanism changes in a
future version of Perl (say, one that might not have the concept of
typeglobs anymore :), a new version of this module will take care of
that, but your `Alias' declarations are going to stay the same.
Note that assigning typeglobs means that you can't specify a
synonym for one element of the glob and use the same synonym for a
different target name in a different slot. I.e.,
sub color :Alias(colour) { ... } my $farbe :Alias(colour);
doesn't make sense, since the sub declaration aliases the whole
`colour' glob to `color', but then the scalar declaration aliases
the whole `colour' glob to `farbe', so the first alias is lost.
SigHandler
When used on a subroutine, this attribute declares that subroutine
to be a signal handler for the signal(s) given as options for this
attribute. It thereby frees you from the implementation details of
defining sig handlers and keeps the handler definitions where they
belong, namely with the handler subroutine.
This module deprecates Attribute::Memoize and Attribute::Abstract.
enteredby: MARCEL (Marcel Grunauer)
enteredon: Wed May 30 20:50:11 2001 GMT
The resulting entry would be:
Attribute::
::Util RdpOp A selection of general-utility attributes MARCEL
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