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Manual Reference Pages  -  DECLARE::CONSTRAINTS::SIMPLE::LIBRARY::SCALAR (3)

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NAME

Declare::Constraints::Simple::Library::Scalar - Scalar Constraints

CONTENTS

SYNOPSIS



  # match one of a set of regexes
  my $some_regexes = Matches(qr/foo/, qr/bar/);

  # allow only defined values
  my $is_defined = IsDefined;

  # between 5 and 50 chars
  my $five_to_fifty = HasLength(5, 50);

  # match against a set of values
  my $command_constraint = IsOneOf(qw(create update delete));

  # check for trueness
  my $is_true = IsTrue;

  # simple equality
  my $is_foo = IsEq(foo);



DESCRIPTION

This library contains all constraints to validate scalar values.

CONSTRAINTS

    Matches(@regex)



  my $c = Matches(qr/foo/, qr/bar/);



If one of the parameters matches the expression, this is true.

IsDefined()

True if the value is defined.

    HasLength([$min, [$max]])

Is true if the value has a length above $min (which defaults to 1> and, if supplied, under the value of $max. A simple



  my $c = HasLength;



checks if the value has a length of at least 1.

    IsOneOf(@values)

True if one of the @values equals the passed value. undef values work with this too, so



  my $c = IsOneOf(1, 2, undef);



will return true on an undefined value.

IsTrue()

True if the value evulates to true in boolean context.

    IsEq($comparator)

Valid if the value is eq the $comparator.

SEE ALSO

Declare::Constraints::Simple, Declare::Constraints::Simple::Library

AUTHOR

Robert ’phaylon’ Sedlacek <phaylon@dunkelheit.at>

LICENSE AND COPYRIGHT

This module is free software, you can redistribute it and/or modify it under the same terms as perl itself.
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perl v5.20.3 DECLARE::CONSTRAINTS::SIMPLE::LIBRARY::SCALAR (3) 2006-09-11

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