Declare::Constraints::Simple::Library::Scalar(3p)

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

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.