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.