Type::Tiny::ConstrainedObject - Online Linux Manual PageSection : 3pm
Updated : 2021-02-24
Source : perl v5.32.1
Note : User Contributed Perl Documentation
NAMEType::Tiny::ConstrainedObject − shared behavour for Type::Tiny::Class, etc
STATUSThis module is considered experiemental.
DESCRIPTION
MethodsThe following methods exist for Type::Tiny::Class, Type::Tiny::Role, Type::Tiny::Duck, and any type constraints that inherit from ​Object or Overload in Types::Standard. These methods will also work for Type::Tiny::Intersection if at least one of the types in the intersection provides these methods. These methods will also work for Type::Tiny::Union if all of the types in the union provide these methods. stringifies_to($constraint) Generates a new child type constraint which checks the object's stringification against a constraint. For example: ​ my $type = Type::Tiny::Class−>new(class => 'URI'); ​ my $child = $type−>stringifies_to( StrMatch[qr/^http:/] ); ​ ​ $child−>assert_valid( URI−>new("http://example.com/") ); In the above example, $child is a type constraint that checks objects are blessed into (or inherit from) the URI class, and when stringified (e.g. though overloading) the result matches the regular expression qr/^http:/. ​$constraint may be a type constraint, something that can be coerced to a type constraint (such as a coderef returning a boolean), a string of Perl code operating on $_, or a reference to a regular expression. So the following would work: ​ my $child = $type−>stringifies_to( sub { qr/^http:/ } ); ​ my $child = $type−>stringifies_to( qr/^http:/ ); ​ my $child = $type−>stringifies_to( 'm/^http:/' ); ​ ​ my $child = $type−>where('"$_" =~ /^http:/'); numifies_to($constraint) The same as stringifies_to but checks numification. The following might be useful: ​ use Types::Standard qw(Int Overload); ​ my $IntLike = Int | Overload−>numifies_to(Int) with_attribute_values($attr1 => $constraint1, ...) This is best explained with an example: ​ use Types::Standard qw(InstanceOf StrMatch); ​ use Types::Common::Numeric qw(IntRange); ​ ​ my $person = InstanceOf['Local::Human']; ​ my $woman = $person−>with_attribute_values( ​ gender => StrMatch[ qr/^F/i ], ​ age => IntRange[ 18 => () ], ​ ); ​ ​ $woman−>assert_valid($alice); This assertion will firstly check that $alice is a Local::Human, then check that $alice−>gender starts with an ‟F”, and lastly check that $alice−>age is an integer at least 18. Again, constraints can be type constraints, coderefs, strings of Perl code, or regular expressions. Technically the ‟attributes” don't need to be Moo/Moose/Mouse attributes, but any methods which can be called with no parameters and return a scalar.
BUGSPlease report any bugs to <https://github.com/tobyink/p5−type−tiny/issues>.
SEE ALSOType::Tiny::Manual. Type::Tiny.
AUTHORToby Inkster <tobyink@cpan.org>.
COPYRIGHT AND LICENCEThis software is copyright (c) 2019−2021 by Toby Inkster. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
DISCLAIMER OF WARRANTIES​THIS PACKAGE IS PROVIDED ‟AS IS” AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 0
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