PDL::Lvalue - declare PDL lvalue subs

       Copyright (C) 2001 Christian Soeller (c.soeller@auckland.ac.nz). All rights reserved. There is no
       warranty. You are allowed to redistribute this software / documentation under certain conditions. For
       details, see the file COPYING in the PDL distribution. If this file is separated from the PDL
       distribution, the copyright notice should be included in the file.

perl v5.34.0                                       2022-02-08                                        Lvalue(3pm)

       Declares a subset of PDL functions so that they can be used as lvalue subs. In particular, this allows
       simpler constructs such as

         $x->slice(',(0)') .= 1;

       instead of the clumsy

         (my $tmp = $x->slice(',(0)')) .= 1;

       This will only work if your perl supports lvalue subroutines (i.e. versions  >= v5.6.0). Note that lvalue
       subroutines are currently regarded experimental.

subs
       test if routine is a known PDL lvalue sub

         print "slice is an lvalue sub" if PDL::Lvalue->subs('slice');

       returns the list of PDL lvalue subs if no routine name is given, e.g.

         @lvfuncs = PDL::Lvalue->subs;

       It can be used in scalar context to find out if your PDL has lvalue subs:

         print 'has lvalue subs' if PDL::Lvalue->subs;

       PDL::Lvalue - declare PDL lvalue subs

        use PDL::Lvalue; # automatically done with all PDL loaders