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# Copyright (c) 1997-2024
# Ewgenij Gawrilow, Michael Joswig, and the polymake team
# Technische Universität Berlin, Germany
# https://polymake.org
#
# This program 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 2, or (at your option) any
# later version: http://www.gnu.org/licenses/gpl.txt.
#
# This program 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.
#-------------------------------------------------------------------------------
use strict;
use namespaces;
use warnings qw(FATAL void syntax misc);
use feature 'state';
# A "virtual" package:
# per default offers dummy methods which do not store anything.
# Should be redefined when needed
package Polymake::Core::Help;
my $dummy = bless [ ];
sub new { $dummy }
*clone = \&new;
sub add {}
sub get { undef }
sub related { [ ] }
declare ($core, $gather);
my @activation_callbacks;
sub activate {
$core = shift;
$gather = true;
{
no strict 'refs';
my $pkg = ref($core);
my $pkg_new = \&{"$pkg\::new"};
*new = sub { shift; $pkg->new(@_) };
}
$_->($core) for @activation_callbacks;
}
sub add_activation_callback {
push @activation_callbacks, @_;
}
1
# Local Variables:
# cperl-indent-level:3
# indent-tabs-mode:nil
# End:
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