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.IX Title "Perl::Critic::Policy::Freenode::OverloadOptions 3pm"
.TH Perl::Critic::Policy::Freenode::OverloadOptions 3pm "2018-12-21" "perl v5.28.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Perl::Critic::Policy::Freenode::OverloadOptions \- Don't use overload without
specifying a bool overload and enabling fallback
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The overload module allows an object class to specify behavior for an object
used in various operations. However, when activated it enables additional
behavior by default: it autogenerates
overload behavior for operators that are not specified, and if it cannot
autogenerate an overload for an operator, using that operator on the object
will throw an exception.
.PP
An autogenerated boolean overload can lead to surprising behavior where an
object is considered \*(L"false\*(R" because of another overloaded value. For example,
if a class overloads stringification to return the object's name, but the
object's name is \f(CW0\fR, then the object will be considered false due to an
autogenerated overload using the boolean value of the string. This is rarely
desired behavior, and if needed, it can be set as an explicit boolean overload.
.PP
Without setting the \f(CW\*(C`fallback\*(C'\fR option, any operators that cannot be
autogenerated from defined overloads will result in an exception when used.
By setting \f(CW\*(C`fallback\*(C'\fR to \f(CW1\fR, the operator will instead fall back to standard
behavior as if no overload was defined, which is generally the expected
behavior when only overloading a few operations.
.PP
.Vb 4
\& use overload \*(Aq""\*(Aq => sub { $_[0]\->name };                    # not ok
\& use overload \*(Aq""\*(Aq => sub { $_[0]\->name }, bool => sub { 1 }; # not ok
\& use overload \*(Aq""\*(Aq => sub { $_[0]\->name }, fallback => 1;     # not ok
\& use overload \*(Aq""\*(Aq => sub { $_[0]\->name }, bool => sub { 1 }, fallback => 1; # ok
.Ve
.SH "AFFILIATION"
.IX Header "AFFILIATION"
This policy is part of Perl::Critic::Freenode.
.SH "CONFIGURATION"
.IX Header "CONFIGURATION"
This policy is not configurable except for the standard options.
.SH "AUTHOR"
.IX Header "AUTHOR"
Dan Book, \f(CW\*(C`dbook@cpan.org\*(C'\fR
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2015, Dan Book.
.PP
This library is free software; you may redistribute it and/or modify it under
the terms of the Artistic License version 2.0.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Perl::Critic