NAME
warnings::method - Produces warnings if methods are called as functions
VERSION
This document describes warnings::method version 0.10
SYNOPSIS
use warnings::method; # installs the check routine lexically
use warnings::method -global; # or installs it globally
use warnings 'syntax'; # enables the check routine
package Foo;
sub bar :method{
# ...
}
Foo->bar(); # OK
# the following cases warnings "Method Foo::bar() called as a function"
Foo::bar(); # WARN
my $method_ref = \&Foo::bar; # WARN
sub f{
goto &Foo::bar; # WARN
}
DESCRIPTION
You shouldn't call a method as a function, e.g. UNIVERSAL::isa($o, 'ARRAY')
. It's considered harmful, because such code doesn't call overridden methods in any classes. This pragmatic module produces warnings if methods are called as functions. Here, methods are subroutines declared with the :method attribute.
This module scans the compiled syntax tree, checks function calls and produces warnings when dangerous function calls are detected. All the processes finish in compile time, so this module has no effect on run-time behavior.
The UNIVERSAL::isa
and UNIVERSAL::can
distributions are modules based on the same concept, but they produce warnings at run time.
INTERFACE
use warnings::method
or use warnings::method -lexical
Installs the method
check routine with lexical scope.
Note that the lexicality is limited before 5.10.0.
use warnings::method -global
Installs the method
check routine with global scope, where this pragma checks all programs.
use/no warnings 'syntax';
Enables/Disables the method
check routine.
Note that the syntax
warning is defined by default, so you can always use it even if warnings::method
is not loaded.
DEPENDENCIES
Perl 5.8.1 or later, and a C compiler.
BUGS AND LIMITATIONS
No bugs have been reported.
Please report any bugs or feature requests to bug-warnings-method@rt.cpan.org/
, or through the web interface at http://rt.cpan.org/.
SEE ALSO
AUTHOR
Goro Fuji <gfuji(at)cpan.org>
LICENSE AND COPYRIGHT
Copyright (c) 2008, Goro Fuji <gfuji(at)cpan.org>. Some rights reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.