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Hello again,
what does \!* do int his line
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Thanks! (1 Reply)
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hi..
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Method::Alias(3pm) User Contributed Perl Documentation Method::Alias(3pm)
NAME
Method::Alias - Create method aliases (and do it safely)
SYNOPSIS
# My method
sub foo {
...
}
# Alias the method
use Method::Alias 'bar' => 'foo',
'baz' => 'foo';
DESCRIPTION
For a very long time, whenever I wanted to have a method alias (provide an alternate name for a method) I would simple do a GLOB alias.
That is,
# My method
sub foo {
...
}
# Alias the method
*bar = *foo;
While this works fine for functions, it does not work for methods.
If your class has a subclass that redefines "foo", any call to "bar" will result in the overloaded method being ignored and the wrong "foo"
method being called.
These are basically bugs waiting to happen, and having completed a number of very large APIs with lots of depth myself, I've been bitten
several times.
In this situation, the canonical and fasest way to handle an alias looks something like this.
# My method
sub foo {
...
}
# Alias the method
sub bar { shift->foo(@_) }
Note that this adds an extra entry to the caller array, but this isn't really all that important unless you are paranoid about these
things.
The alternative would be to try to find the method using UNIVERSAL::can, and then goto it. I might add this later if someone really wants
it, but until then the basic method will suffice.
That doing this right is even worthy of a module is debatable, but I would rather have something that looks like a method alias definition,
than have to document additional methods all the time.
Using Method::Alias
Method::Alias is designed to be used as a pragma, to which you provide a set of pairs of method names. Only very minimal checking is done,
if you wish to create infinite loops or what have you, you are more than welcome to shoot yourself in the foot.
# Add a single method alias
use Method::Alias 'foo' => 'bar';
# Add several method aliases
use Method::Alias 'a' => 'b',
'c' => 'd',
'e' => 'f';
And for now, that's all there is to it.
METHODS
import from => to, ...
Although primarily used as a pragma, you may call import directly if you wish.
Taking a set of pairs of normal strings, the import method creates a number of methods in the caller's package to call the real method.
Returns true, or dies on error.
SUPPORT
Bugs should always be submitted via the CPAN bug tracker
<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Method-Alias>
For other issues, contact the maintainer
AUTHORS
Adam Kennedy <cpan@ali.as>
SEE ALSO
<http://ali.as/>
COPYRIGHT
Copyright 2004, 2006 Adam Kennedy. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
The full text of the license can be found in the LICENSE file included with this module.
perl v5.8.8 2006-07-15 Method::Alias(3pm)
