1Declare::Constraints::SUismeprleC:o:nLtirbiDrbeaucrtlyea:dr:eHP:ae:srChlo(n3Ds)otcruamiennttsa:t:iSoinmple::Library::Hash(3)
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NAME

6       Declare::Constraints::Simple::Library::Hash - Hash Constraints
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SYNOPSIS

9         my $constraint = And(
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11           # make sure all keys are present
12           HasAllKeys( qw(foo bar) ),
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14           # constraints for the keys
15           OnHashKeys( foo => IsInt, bar => HasLength )
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17         );
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DESCRIPTION

20       This module contains all constraints that can be applied to hash
21       references.
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23   HasAllKeys(@keys)
24       The value has to be a hashref, and contain all keys listed in @keys to
25       pass this constraint.
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27       The stack or path part of "HasAllKeys" is "HasAllKeys[$key]" where $key
28       is the missing key.
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30   OnHashKeys(key => $constraint, key => $constraint, ...)
31       This allows you to pass a constraint for each specific key in a hash
32       reference. If a specified key is not in the validated hash reference,
33       the validation for this key is not done. To make a key a requirement,
34       use HasAllKeys(@keys) above in combination with this, e.g. like:
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36         And( HasAllKeys( qw(foo bar baz) )
37              OnHashKeys( foo => IsInt,
38                          bar => Matches(qr/bar/),
39                          baz => IsArrayRef( HasLength )));
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41       Also, as you might see, you don't have to check for "IsHashRef"
42       validity here. The hash constraints are already doing that by
43       themselves.
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45       The stack or path part of "OnHashKeys" looks like "OnHashKeys[$key]"
46       where $key is the key of the failing value.
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SEE ALSO

49       Declare::Constraints::Simple, Declare::Constraints::Simple::Library
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AUTHOR

52       Robert 'phaylon' Sedlacek "<phaylon@dunkelheit.at>"
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55       This module is free software, you can redistribute it and/or modify it
56       under the same terms as perl itself.
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60perl v5.28.0                    De2c0l0a6r-e0:9:-C1o1nstraints::Simple::Library::Hash(3)
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