Path: utzoo!attcan!uunet!aplcen!samsung!cs.utexas.edu!radar!cadillac!vaughan@mcc.com
From: vaughan@mcc.com (Paul Vaughan)
Newsgroups: comp.lang.c++
Subject: Re: initializing a struct (or any class) array
Keywords: struct initialization
Message-ID: <12135@cadillac.CAD.MCC.COM>
Date: 15 Oct 90 16:35:35 GMT
References: <2840@unccvax.uncc.edu> <4596@sage.cc.purdue.edu>
Sender: news@cadillac.CAD.MCC.COM
Reply-To: vaughan@mcc.com (Paul Vaughan)
Organization: MCC VLSI CAD Program
Lines: 71
In-reply-to: rusbara2@sage.cc.purdue.edu (Bob Rusbasan)


   From: rusbara2@sage.cc.purdue.edu (Bob Rusbasan)

   In article <2840@unccvax.uncc.edu> cs00jec@unccvax.uncc.edu (Jim Cain) writes:
   >
   >I am trying to define a structure array for a static set of data. In C I
   >would declare the following:
   [ example of typical structure initialization deleted ]

   >This will be used by a parser as a look-up table for command names and
   >other information which belongs to each command.

   >This is identical to C code I have written that works. My question is --
   >Is something this simple possible in C++? It seems that C++ considers
   >structs and unions as classes. Can you initialize class object arrays
   >like this? I really don't want the overhead of using pointers (such as
   >a linked list representation) because there is no reason for this data
   >to be dynamic (unless, of course, that's the only way to do it).

   I remember having tons of fun when I first tried to do this.  What would
   be nice is if you could do this

. . .

   Anyway, here's what you have to do (unless I missed something; Lord 
   knows I tried, and this does work):

   foo name[] = {
	   foo ( 0, 5, "name"),
	   foo ( 7, 4, "another_name" )
	   foo [ ... ]
   };

Bob gave a reasonable answer, but seems to have missed that the
original code posted by Jim also works fine (and is simpler to some
people's minds).

#include <stream.h>

struct {
   char *name;
   int i;
} list [] = {
   "namezero", 5,
   "nameone", 1,
   "namen", 16
};

main() {
  for(int i = 0; i < 3; i++)
    cout << list[i].name << " " << list[i].i << "\n";
}

bash$ !g
g++ -o trash trash.cc
bash$ trash
namezero 5
nameone 1
namen 16
bash$ !C
CC -o trash trash.cc
CC  trash.cc:
cc   -o /d2/prism/prism/src/sim/src/trash -I/net/sunspot/usr/cadsw/CC/sun4/incl  trash.c  -L/net/sunspot/usr/cadsw/CC/sun4/ -lC
bash$ trash
namezero 5
nameone 1
namen 16


 Paul Vaughan, MCC CAD Program | ARPA: vaughan@mcc.com | Phone: [512] 338-3639
 Box 200195, Austin, TX 78720  | UUCP: ...!cs.utexas.edu!milano!cadillac!vaughan