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Perl: The Complete Reference
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test is deprecated use the object io at t2pl line 5
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The function name is inserted first or the package or file name if it s within the global scope just as in the core warn function You can also be more specific about the warnings that you want to test for; if you supply arguments to the warnings::enabled function, for instance, it returns true only if the warning type specified has been enabled:
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if (warnings::enabled('deprecated'))
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The strict Pragma
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As with warnings, you should have the strict pragma enforced at all times It will help you to pick more of those ambiguous instances where your script may fail without warning It is no replacement for a full debugger, but it will highlight problems that a normal debugging process might overlook The basic form of the pragma is
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The pragma is lexically scoped, so it is in effect only within the current block This means you must specify use strict separately within all the packages, modules, and individual scripts you create If a script that uses the strict pragma imports a module that does not, only the script portion will be checked the pragma s effects are not propagated down to other modules By using the pragma, you should be able to identify the effects of assumptions Perl makes about what you are trying to achieve It does this by imposing limits on the definition and use of variables, references, and barewords that would otherwise be
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The strict pragma restricts those constructs and statements that would normally be considered unsafe or ambiguous Unlike warnings, which raise errors without causing the script to fail, the strict pragma will halt the execution of the script if any of the restrictions enforced by the pragma are broken Although the pragma imposes limits that cause scripts to fail, the pragma generally encourages (and even enforces) good programming practice For some casual scripts it does, of course, cause more problems than you might be trying to solve
19:
Controlling Execution with Pragmas
interpreted as functions (subroutines) These can be individually turned on or off using the vars, refs, and subs options to the pragma You supply the option as an argument to the pragma when the corresponding module is imported For example, to enable only the refs and subs options, use the following:
use strict qw/refs subs/;
The effects are cumulative, so this could be rewritten as
use strict 'refs'; use strict 'subs';
The pragma also supports the capability to turn it off through the no keyword, so you can temporarily turn off strict checking:
use strict; no strict 'vars'; $var = 1; use strict 'vars'; DEVELOPING APPLICATIONS
Unless you have any very special reason not to, I recommend using the basic strict to enable all three levels of checking
The vars Option
The vars option requires that all variables be predeclared before they are used, either with the my keyword, with the use vars pragma, or through a fully qualified name that includes the name of the enclosing package in which you want the variable to be defined When using the pragma, the local keyword is not sufficient because its purpose is only to localize a variable, not to declare it Therefore the following examples work,
use strict 'vars'; $Module::vara = 1; my $vara = 1; use vars qw/$varb/;
Perl: The Complete Reference
but these will fail:
use strict 'vars'; $vars = 1; local $vars = 1;
One of the most frustrating elements of the vars option is that you ll get a list of errors relating to the use of variables For example, the script
use strict; %hash = ('Martin' => 'Brown', 'Sharon' => 'Penfold', 'Wendy' => 'Rinaldi',); foreach $key (sort keys %hash) { print "$key -> $hash{$key}\n"; }
raises these errors when executed:
$ perl -w t2pl Global symbol "%hash" requires explicit package name at t2pl line 3 Global symbol "$key" requires explicit package name at t2pl line 7 Global symbol "%hash" requires explicit package name at t2pl line 7 Global symbol "$key" requires explicit package name at t2pl line 9 Global symbol "%hash" requires explicit package name at t2pl line 9 Global symbol "$key" requires explicit package name at t2pl line 9 Execution of t2pl aborted due to compilation errors
The obvious solution to the problem is to declare the variables using my:
use strict; my %hash = ('Martin' => 'Brown', 'Sharon' => 'Penfold', 'Wendy' => 'Rinaldi',); foreach my $key (sort keys %hash) { print "$key -> $hash{$key}\n"; }
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