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.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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.\"
.IX Title "Declare::Constraints::Simple::Library::Scalar 3pm"
.TH Declare::Constraints::Simple::Library::Scalar 3pm "2018-03-31" "perl v5.26.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Declare::Constraints::Simple::Library::Scalar \- Scalar Constraints
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  # 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(\*(Aqfoo\*(Aq);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This library contains all constraints to validate scalar values.
.SH "CONSTRAINTS"
.IX Header "CONSTRAINTS"
.SS "Matches(@regex)"
.IX Subsection "Matches(@regex)"
.Vb 1
\&  my $c = Matches(qr/foo/, qr/bar/);
.Ve
.PP
If one of the parameters matches the expression, this is true.
.SS "\fIIsDefined()\fP"
.IX Subsection "IsDefined()"
True if the value is defined.
.SS "HasLength([$min, [$max]])"
.IX Subsection "HasLength([$min, [$max]])"
Is true if the value has a length above \f(CW$min\fR (which defaults to 1> and,
if supplied, under the value of \f(CW$max\fR. A simple
.PP
.Vb 1
\&  my $c = HasLength;
.Ve
.PP
checks if the value has a length of at least 1.
.SS "IsOneOf(@values)"
.IX Subsection "IsOneOf(@values)"
True if one of the \f(CW@values\fR equals the passed value. \f(CW\*(C`undef\*(C'\fR values
work with this too, so
.PP
.Vb 1
\&  my $c = IsOneOf(1, 2, undef);
.Ve
.PP
will return true on an undefined value.
.SS "\fIIsTrue()\fP"
.IX Subsection "IsTrue()"
True if the value evulates to true in boolean context.
.SS "IsEq($comparator)"
.IX Subsection "IsEq($comparator)"
Valid if the value is \f(CW\*(C`eq\*(C'\fR the \f(CW$comparator\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Declare::Constraints::Simple, Declare::Constraints::Simple::Library
.SH "AUTHOR"
.IX Header "AUTHOR"
Robert 'phaylon' Sedlacek \f(CW\*(C`<phaylon@dunkelheit.at>\*(C'\fR
.SH "LICENSE AND COPYRIGHT"
.IX Header "LICENSE AND COPYRIGHT"
This module is free software, you can redistribute it and/or modify it 
under the same terms as perl itself.