Declare::Constraints::Simple::Library::Referencial - Ref Constraints
# scalar or array references
my $scalar_or_array = IsRefType( qw(SCALAR ARRAY) );
# scalar reference
my $int_ref = IsScalarRef( IsInt );
# accept mappings of ids to objects with "name" methods
my $id_obj_map =
IsHashRef( -keys => IsInt,
-values => And( IsObject,
HasMethods('name') ));
# an integer list
my $int_list = IsArrayRef( IsInt );
# accept code references
my $is_closure = IsCodeRef;
# accept a regular expression
my $is_regex = IsRegex;
This library contains those constraints that can test the validity of references and their types.
Valid if the value is a reference of a kind in @types.
This is true if the value is a scalar reference. A possible constraint for the scalar references target value can be passed. E.g.
my $test_integer_ref = IsScalarRef(IsInt);
The value is valid if the value is an array reference. The contents of the array can be validated by passing an other $constraint as argument.
The stack or path part of IsArrayRef is IsArrayRef[$index] where $index is the index of the failing element.
True if the value is a hash reference. It can also take two named parameters: -keys can pass a constraint to check the hashes keys, -values does the same for its values.
The stack or path part of IsHashRef looks like IsHashRef[$type $key] where $type is either val or key depending on what was validated, and $key being the key that didn't pass validation.
Code references have to be valid to pass this constraint.
True if the value is a regular expression built with qr. Note however, that a simple string that could be used like /$rx/ will not pass this constraint. You can combine multiple constraints with And(@constraints) though.
Declare::Constraints::Simple, Declare::Constraints::Simple::Library
Robert 'phaylon' Sedlacek <phaylon@dunkelheit.at>
This module is free software, you can redistribute it and/or modify it under the same terms as perl itself.
