Re: lispArchiver and superclass

[Marcus G. Daniels]

>>>>> "GO" == Gadi ORON <address@hidden> writes:

GO> How can you ask a superclass to be allocated through the
GO> lispArchiver?

By default, all the variables of the class and its superclasses
are collected and saved.  The +createBegin: of the class named
by the argument of make-instance in the .scm file is the one that
runs.

When you have a class that requires some parameters to be create-time,
then that class needs to have a lispInCreate: method so that these are
set before -createEnd runs.  If your Rectangle was a real GUI
rectangle, then you'd probably want that.

Here's an example (without the extra lispInCreate: method).

#import <simtools.h> // initSwarmBatch
#import <defobj/Create.h> // CreateDrop
#import <defobj.h> // lispAppArchvier
#import <collections.h> // OutputStream

@interface Shape: CreateDrop
{
  unsigned scale;
  int x, y;
}
+ createBegin: aZone;
- (void)describe: stream;
@end

@implementation Shape
+ createBegin: aZone
{
  Shape *shape = [super createBegin: aZone];
  
  shape->scale = 2;
  shape->x = 100;
  shape->y = 200;
  return shape;
}

- (void)describe: (id <OutputStream>)stream
{
  [stream catC: "+"];
  [stream catInt: x];
  [stream catC: "+"];
  [stream catInt: y];
  [stream catC: " *"];
  [stream catUnsigned: scale];
}
@end

@interface Rect: Shape
{
  unsigned width;
  unsigned height;
}
+ createBegin: aZone;
- (void)describe: (id <OutputStream>)stream;
@end

@implementation Rect
+ createBegin: aZone
{
  Rect *rectangle = [super createBegin: aZone];
  rectangle->height = 10;
  rectangle->width = 20;
  return rectangle;
}

- (void)describe: (id <OutputStream>)stream
{
  [stream catC: "["];
  [stream catC: [self getName]];
  [stream catC: "] "];
  [stream catUnsigned: width];
  [stream catC: "x"];
  [stream catUnsigned: height];
  [super describe: stream];
  [stream catC: "\n"];
}
@end

int
main (int argc, const char **argv)
{
  initSwarmBatch (argc, argv);

  {
    id rectangle;
    
    if ((rectangle = [lispAppArchiver getObject: "rectangle"]))
      xprint (rectangle);
    else
      {
        rectangle = [Rect create: globalZone];
        
        [lispAppArchiver putDeep: "rectangle" object: rectangle];
        [lispAppArchiver sync];
      }
  }
  return 0;
}

/*
Local Variables:
compile-command: "$SWARMHOME/bin/libtool-swarm --mode=link gcc 
-DAPPNAME=archiveShape -o archiveShape -Wall -Werror -g -Wno-import 
-I$SWARMHOME/include/swarm -L$SWARMHOME/lib/swarm archiveShape.m -lswarm -lobjc"
End:
*/


                  ==================================
   Swarm-Support is for discussion of the technical details of the day
   to day usage of Swarm.  For list administration needs (esp.
   [un]subscribing), please send a message to <address@hidden>
   with "help" in the body of the message.