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.\" ========================================================================
.\"
.IX Title "Class::ErrorHandler 3pm"
.TH Class::ErrorHandler 3pm "2017-08-06" "perl v5.26.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Class::ErrorHandler \- Base class for error handling
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    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 $foo\->errstr;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIClass::ErrorHandler\fR provides an error-handling mechanism that's generic
enough to be used as the base class for a variety of \s-1OO\s0 classes. Subclasses
inherit its two error-handling methods, \fIerror\fR and \fIerrstr\fR, to
communicate error messages back to the calling program.
.PP
On failure (for whatever reason), a subclass should call \fIerror\fR and return
to the caller; \fIerror\fR itself sets the error message internally, then
returns \f(CW\*(C`undef\*(C'\fR. This has the effect of the method that failed returning
\&\f(CW\*(C`undef\*(C'\fR to the caller. The caller should check for errors by checking for a
return value of \f(CW\*(C`undef\*(C'\fR, and calling \fIerrstr\fR to get the value of the
error message on an error.
.PP
As demonstrated in the \s-1SYNOPSIS\s0, \fIerror\fR and \fIerrstr\fR work as both class
methods and object methods.
.SH "USAGE"
.IX Header "USAGE"
.SS "Class\->error($message)"
.IX Subsection "Class->error($message)"
.ie n .SS "$object\->error($message)"
.el .SS "\f(CW$object\fP\->error($message)"
.IX Subsection "$object->error($message)"
Sets the error message for either the class \fIClass\fR or the object
\&\fI\f(CI$object\fI\fR to the message \fI\f(CI$message\fI\fR. Returns \f(CW\*(C`undef\*(C'\fR.
.SS "Class\->errstr"
.IX Subsection "Class->errstr"
.ie n .SS "$object\->errstr"
.el .SS "\f(CW$object\fP\->errstr"
.IX Subsection "$object->errstr"
Accesses the last error message set in the class \fIClass\fR or the
object \fI\f(CI$object\fI\fR, respectively, and returns that error message.
.SH "LICENSE"
.IX Header "LICENSE"
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
.SH "AUTHOR & COPYRIGHT"
.IX Header "AUTHOR & COPYRIGHT"
Except where otherwise noted, \fIClass::ErrorHandler\fR is Copyright 2004
Benjamin Trott, cpan@stupidfool.org. All rights reserved.