Math::PlanePath::Base::Generic -- various path helpers

       This is a few generic helper functions for the PlanePath code.  They're designed to work on plain Perl
       integers and floats and in some cases there's some special support for "Math::BigInt".

       Nothing is exported by default but each function below can be as in the usual Exporter style,

           use Math::PlanePath::Base::Generic 'round_nearest';

       (But not "parameter_info_nstart0()" and "parameter_info_nstart1()", for the reason described below.)

Generic
       "$x = round_nearest ($x)"
           Return  $x rounded to the nearest integer.  If $x is half way, such as 2.5 then it's round upwards to
           3.

              $x = round_nearest($x);

       "$href = Math::PlanePath::Base::Generic::parameter_info_nstart0()"
       "$href = Math::PlanePath::Base::Generic::parameter_info_nstart1()"
           Return an "n_start" parameter hashref suitable for use in a  "parameter_info_array()",  with  default
           either 0 or 1.  For example,

               # alone
               package Math::PlanePath::MySubclass;
               use constant parameter_info_array =>
                 [ Math::PlanePath::Base::Generic::parameter_info_nstart1() ];

               # or with other parameters too
               package Math::PlanePath::MySubclass;
               use constant parameter_info_array =>
                 [
                  { name            => 'something',
                    type            => 'integer',
                    default         => '123',
                  },
                  Math::PlanePath::Base::Generic::parameter_info_nstart1(),
                 ];

           This  function is not exportable since it's meant for a one-off call in an initializer and so no need
           to import it for repeated use.

       <http://user42.tuxfamily.org/math-planepath/index.html>

       Copyright 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Kevin Ryde

       This file is part of Math-PlanePath.

       Math-PlanePath is free software; you can redistribute it and/or modify it under  the  terms  of  the  GNU
       General  Public  License  as  published  by  the  Free Software Foundation; either version 3, or (at your
       option) any later version.

       Math-PlanePath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without  even
       the  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
       License for more details.

       You should have received a copy of the GNU General Public License along with Math-PlanePath.  If not, see
       <http://www.gnu.org/licenses/>.

perl v5.32.0                                       2021-01-23                Math::PlanePath::Base::Generic(3pm)

       Math::PlanePath::Base::Generic -- various path helpers

       Math::PlanePath, Math::PlanePath::Base::Digits, Math::PlanePath::Base::NSEW

        use Math::PlanePath::Base::Generic 'round_nearest';
        $x = round_nearest($x);