From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu,  8 Sep 1994 14:13:30 -0400
From: bobf@plan9.research.att.com bobf@plan9.research.att.com
Subject: No subject
Topicbox-Message-UUID: 033be2a4-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19940908181330.lJv12i-1hLMHGKpB1wKCXGnBGDlcRrMnqL3vFVF1pFA@z>

> #include <alef.h>
> 
> void
> main(int argc, byte **argv)
> {
> 	 rescue  {
> 		print("1");
> 		return;
> 	 }
> 	 rescue  {
> 		print("2");
> 		raise ;
> 	 } 
> 	 raise ;	
> }

this is a compiler bug that has been fixed.

> enum {TEXT, AUDIO, VIDEO, MULTI};
> 
> void (*f[]) = { /* I'm not sure about f or Mesg.f */
> 	[TEXT]  Mime.ldtext(),
> 	[AUDIO] Mime.ldaudio(),
> 	[VIDEO] Mime.ldvideo(),
> 	[MULTI] Mime.ldmulti(),
> };
> 
> and later do (*f[type])(); /* this avoid switch or if else */

use the form .<typename>.function to refer to the functions.

	[TEXT]  .Mime.ldtext,
	[AUDIO] .Mime.ldaudio,
	[VIDEO] .Mime.ldvideo,
	[MULTI] .Mime.ldmulti,

works with our compiler.

> adt Mime{
> 	.....
> 	void write(*Mime,int);
> };
> 
> adt Mesg {
> 	.....
> 	Mime;
> 	void write(*Mesg,int);
> };
> 
> If I want to access Mime.write through a Mesg object, Is it
> save to use casting? 
>
> void
> Mesg.write(Mesg *m,int)
> 
> 	((Mime *)m)->write(0); /* in order to call MIME.write */
> }

unnamed members can be referenced by their type name.  use

	m->Mime.write(0);



we are working on a new plan 9 distribution.  it contains an Alef
compiler with many bug fixes, some new features, and improved
documentation.