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Man Pages


Manual Reference Pages  -  CLASS::ERRORHANDLER (3)

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NAME

Class::ErrorHandler - Base class for error handling

CONTENTS

SYNOPSIS



    package Foo;
    use base qw( Class::ErrorHandler );

    sub class_method {
        my $class = shift;
        ...
        return $class->error("Help!")
            unless $continue;
    }

    sub object_method {
        my $obj = shift;
        ...
        return $obj->error("I am no more")
            unless $continue;
    }

    package main;
    use Foo;

    Foo->class_method or die Foo->errstr;

    my $foo = Foo->new;
    $foo->object_method or die $foo->errstr;



DESCRIPTION

Class::ErrorHandler provides an error-handling mechanism that’s generic enough to be used as the base class for a variety of OO classes. Subclasses inherit its two error-handling methods, error and errstr, to communicate error messages back to the calling program.

On failure (for whatever reason), a subclass should call error and return to the caller; error itself sets the error message internally, then returns undef. This has the effect of the method that failed returning undef to the caller. The caller should check for errors by checking for a return value of undef, and calling errstr to get the value of the error message on an error.

As demonstrated in the SYNOPSIS, error and errstr work as both class methods and object methods.

USAGE

    Class->error($message)

CW$object->error($message)

Sets the error message for either the class Class or the object $object to the message $message. Returns undef.

    Class->errstr

CW$object->errstr

Accesses the last error message set in the class Class or the object $object, respectively, and returns that error message.

LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR & COPYRIGHT

Except where otherwise noted, Class::ErrorHandler is Copyright 2004 Benjamin Trott, cpan@stupidfool.org. All rights reserved.
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perl v5.20.3 CLASS::ERRORHANDLER (3) 2015-05-10

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