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Declare::Constraints::Simple::Library::Array(3pm) User Contributed Perl Documentation Declare::Constraints::Simple::Library::Array(3pm)

NAME

Declare::Constraints::Simple::Library::Array - Array Constraints

SYNOPSIS

  # accept a list of pairs
  my $pairs_validation = IsArrayRef( HasArraySize(2,2) );

  # integer => object pairs
  my $pairs = And( OnEvenElements(IsInt), 
                   OnOddElements(IsObject) );

  # a three element array
  my $tri = And( HasArraySize(3,3),
                 OnArrayElements(0, IsInt,
                                 1, IsDefined,
                                 2, IsClass) );

DESCRIPTION

This module contains all constraints that can be applied to array references.

CONSTRAINTS

HasArraySize([$min, [$max]])

With $min defaulting to 1. So a specification of 

  my $profile = HasArraySize;

checks for at least one value. To force an exact size of the array, specify the same values for both:

  my $profile = HasArraySize(3, 3);

OnArrayElements($key => $constraint, $key => $constraint, ...)

Applies the the $constraints to the corresponding $keys if they are present. For required keys see "HasArraySize".

OnEvenElements($constraint)

Runs the constraint on all even elements of an array. See also "OnOddElements".

OnOddElements($constraint)

Runs the constraint on all odd elements of an array. See also "OnEvenElements".

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.
2018-03-31 perl v5.26.1