Source: libperlx-maybe-perl Section: perl Priority: optional Build-Depends: debhelper-compat (= 13), perl, libmodule-manifest-skip-perl Maintainer: Debian Perl Group Uploaders: Jonas Smedegaard , Florian Schlichting Standards-Version: 4.6.0 Vcs-Git: https://salsa.debian.org/perl-team/modules/packages/libperlx-maybe-perl.git Vcs-Browser: https://salsa.debian.org/perl-team/modules/packages/libperlx-maybe-perl Homepage: https://metacpan.org/release/PerlX-Maybe Testsuite: autopkgtest-pkg-perl Rules-Requires-Root: no Package: libperlx-maybe-perl Architecture: all Depends: ${misc:Depends}, ${perl:Depends}, libmodule-manifest-skip-perl Recommends: libperlx-maybe-xs-perl, libexporter-tiny-perl Suggests: libsyntax-perl Description: return a pair only if they are both defined Moose classes (and some other classes) distinguish between an attribute being unset and the attribute being set to undef. Supplying a constructor arguments like this: . my $bob = Person->new( name => $name, age => $age, ); . Will result in the "name" and "age" attributes possibly being set to undef (if the corresponding $name and $age variables are not defined), which may violate the Person class' type constraints. . PerlX::Maybe checks that $x and $y are both defined. If they are, it returns them both as a list; otherwise it returns the empty list. . This package also includes Syntax::Feature::Maybe.