1Declare::Constraints::SUismeprleC:o:nDLteircbilrbaaurrteye::d::CGPoeennrseltrraDaloi(cn3ut)mse:n:tSaitmipolne::Library::General(3)
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NAME

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

9         # custom error messages
10         my $constraint =
11           And( Message( 'You need to specify a Value', IsDefined ),
12                Message( 'The specified Value is not an Int', IsInt ));
13
14         # build results
15         my $valid   = ReturnTrue;
16         my $invalid = ReturnFalse('Just because');
17

DESCRIPTION

19       This library is meant to contain those constraints and constraint-like
20       elements that apply generally to the whole framework.
21

CONSTRAINTS

23   Message($message, $constraint)
24       Overrides the "message" set on the result object for failures in
25       $constraint. For example:
26
27         my $message = 'How hard is it to give me a number?';
28         my $constraint = Message($message, IsNumber);
29
30         my $result = $constraint->('duh...');
31         print $result->message, "\n";
32
33       The "Message" constraint overrides the error message returned by it's
34       whole subtree, however, the "Message" specification nearest to the
35       point of failure will win. So while this
36
37         my $constraint = Message( 'Foo',
38                                   IsArrayRef( Message( 'Bar', IsInt )));
39
40         my $result = $constraint->(['I am not an Integer']);
41         print $result->message;
42
43       will print "Bar", this
44
45         my $result = $constraint->('I\'m not even an ArrayRef');
46         print $result->message;
47
48       will output "Foo".
49
50   Scope($name, $constraint)
51       Executes the passed $constraint in a newly generated scope named $name.
52
53   SetResult($scope, $name, $constraint)
54       Stores the result ov an evaluation of $constraint in $scope under
55       $name.
56
57   IsValid($scope, $name)
58       Returns a true result if the result $name, which has to have been
59       stored previously in the scope named $scope, was valid.
60
61   ReturnTrue()
62       Returns a true result.
63
64   ReturnFalse($msg)
65       Returns a false result containing $msg as error message.
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SEE ALSO

68       Declare::Constraints::Simple, Declare::Constraints::Simple::Library
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AUTHOR

71       Robert 'phaylon' Sedlacek "<phaylon@dunkelheit.at>"
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74       This module is free software, you can redistribute it and/or modify it
75       under the same terms as perl itself.
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79perl v5.34.0                 Decla2r0e2:1:-C0o7n-s2t2raints::Simple::Library::General(3)
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