1Declare::Constraints::SUismeprDleeCc:ol:naLtrirebi:rb:auCrtoyen:ds:tRPreeafrielnrteDsno:cc:iuSamilem(np3tl)aet:i:oLnibrary::Referencial(3)
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NAME

6       Declare::Constraints::Simple::Library::Referencial - Ref Constraints
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SYNOPSIS

9         # scalar or array references
10         my $scalar_or_array = IsRefType( qw(SCALAR ARRAY) );
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12         # scalar reference
13         my $int_ref = IsScalarRef( IsInt );
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15         # accept mappings of ids to objects with "name" methods
16         my $id_obj_map =
17           IsHashRef( -keys   => IsInt,
18                      -values => And( IsObject,
19                                      HasMethods('name') ));
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21         # an integer list
22         my $int_list = IsArrayRef( IsInt );
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24         # accept code references
25         my $is_closure = IsCodeRef;
26
27         # accept a regular expression
28         my $is_regex = IsRegex;
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DESCRIPTION

31       This library contains those constraints that can test the validity of
32       references and their types.
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CONSTRAINTS

35   IsRefType(@types)
36       Valid if the value is a reference of a kind in @types.
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38   IsScalarRef($constraint)
39       This is true if the value is a scalar reference. A possible constraint
40       for the scalar references target value can be passed. E.g.
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42         my $test_integer_ref = IsScalarRef(IsInt);
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44   IsArrayRef($constraint)
45       The value is valid if the value is an array reference. The contents of
46       the array can be validated by passing an other $constraint as argument.
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48       The stack or path part of "IsArrayRef" is "IsArrayRef[$index]" where
49       $index is the index of the failing element.
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51   IsHashRef(-keys => $constraint, -values => $constraint)
52       True if the value is a hash reference. It can also take two named
53       parameters: "-keys" can pass a constraint to check the hashes keys,
54       "-values" does the same for its values.
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56       The stack or path part of "IsHashRef" looks like "IsHashRef[$type
57       $key]" where $type is either "val" or "key" depending on what was
58       validated, and $key being the key that didn't pass validation.
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60   IsCodeRef()
61       Code references have to be valid to pass this constraint.
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63   IsRegex()
64       True if the value is a regular expression built with "qr". Note
65       however, that a simple string that could be used like "/$rx/" will not
66       pass this constraint. You can combine multiple constraints with
67       And(@constraints) though.
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SEE ALSO

70       Declare::Constraints::Simple, Declare::Constraints::Simple::Library
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AUTHOR

73       Robert 'phaylon' Sedlacek "<phaylon@dunkelheit.at>"
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76       This module is free software, you can redistribute it and/or modify it
77       under the same terms as perl itself.
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81perl v5.38.0             Declare::2C0o2n3s-t0r7a-i2n0ts::Simple::Library::Referencial(3)
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