=head1 NAME

UniEvent::SystemError - system error constants



=head1 SYNOPSIS

    $tcp->connect_callback(sub {
        my ($tcp, $err) = @_;
        if ($err) {
            if    ($err == UE::SystemError::timed_out) { ... }
            elsif ($err == UE::SystemError::operation_canceled) { ... }
            ...
        }
    });



=head1 DESCRIPTION

This is alias package for C<XS::STL::errc>, the description of them
is partially available on L<XS::STL::ErrorCode>, but full specs belong
to C++ domain, hence, are available at L<cppreference.com|https://en.cppreference.com/w/cpp/error/errc>.

=cut