Graph::Easy::Base - base class for Graph::Easy objects like nodes, edges etc

       Copyright (C) 2004 - 2008 by Tels <http://bloodgate.com>.

       See the LICENSE file for more details.

perl v5.36.0                                       2022-11-20                             Graph::Easy::Base(3pm)

       Used automatically and internally by Graph::Easy - should not be used directly.

       None by default.

new()
               my $object = Graph::Easy::Base->new();

       Create a new object, and call "_init()" on it.

   error()
               $last_error = $object->error();

               $object->error($error);                 # set new messages
               $object->error('');                     # clear the error

       Returns the last error message, or '' for no error.

       When setting a new error message, "$self->_croak($error)" will be called unless
       "$object->no_fatal_errors()" is true.

   error_as_html()
               my $error = $object->error_as_html();

       Returns the same error message as error(), but properly escaped as HTML so it is safe to output to the
       client.

   warn()
               $object->warn('Warning!');

       Warn on STDERR with the given message.

   no_fatal_errors()
               $object->no_fatal_errors(1);

       Set the flag that determines whether setting an error message via "error()" is fatal, e.g. results in a
       call to "_croak()".

       A true value will make errors non-fatal. See also fatal_errors.

   fatal_errors()
               $fatal = $object->fatal_errors();
               $object->fatal_errors(0);               # turn off
               $object->fatal_errors(1);               # turn on

       Set/get the flag that determines whether setting an error message via "error()" is fatal, e.g. results in
       a call to "_croak()".

       A true value makes errors fatal.

   catch_errors()
               my $catch_errors = $object->catch_errors();     # query
               $object->catch_errors(1);                       # enable

               $object->...();                                 # some error
               if ($object->error())
                 {
                 my @errors = $object->errors();               # retrieve
                 }

       Enable/disable catching of all error messages. When enabled, all previously caught error messages are
       thrown away, and from this poin on new errors are non-fatal and stored internally. You can retrieve these
       errors later with the errors() method.

   catch_warnings()
               my $catch_warns = $object->catch_warnings();    # query
               $object->catch_warnings(1);                     # enable

               $object->...();                                 # some error
               if ($object->warning())
                 {
                 my @warnings = $object->warnings();           # retrieve
                 }

       Enable/disable catching of all warnings. When enabled, all previously caught warning messages are thrown
       away, and from this poin on new warnings are stored internally. You can retrieve these errors later with
       the errors() method.

   catch_messages()
               # catch errors and warnings
               $object->catch_messages(1);
               # stop catching errors and warnings
               $object->catch_messages(0);

       A true parameter is equivalent to:

               $object->catch_warnings(1);
               $object->catch_errors(1);

       See also: catch_warnings() and catch_errors() as well as errors() and warnings().

   errors()
               my @errors = $object->errors();

       Return all error messages that occurred after catch_messages() was called.

   warnings()
               my @warnings = $object->warnings();

       Return all warning messages that occurred after catch_messages() or catch_errors() was called.

   self()
               my $self = $object->self();

       Returns the object itself.

   class()
               my $class = $object->class();

       Returns the full class name like "node.cities". See also "sub_class".

   sub_class()
               my $sub_class = $object->sub_class();

       Returns the sub class name like "cities". See also "class".

   main_class()
               my $main_class = $object->main_class();

       Returns the main class name like "node". See also "sub_class".

       Graph::Easy::Base - base class for Graph::Easy objects like nodes, edges etc

       Graph::Easy.

               package Graph::Easy::My::Node;
               use Graph::Easy::Base;
               @ISA = qw/Graph::Easy::Base/;