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From: fsf@kasparov.scs.com (Rick Farnbach)
Newsgroups: comp.lang.c
Subject: A "How to typedef..." Question
Message-ID: <FSF.90Aug6202518@kasparov.scs.com>
Date: 7 Aug 90 02:25:18 GMT
Sender: Unknown@caeco.UUCP
Distribution: comp
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Lines: 40

How does one create a type, using typedef, that is defined to be a
pointer to a pointer to a pointer... ad infinitum?  The straight-forward
approach is:

     typedef tree *tree[2];     /* binary tree, for example */

Which is, of course, grossly illegal.  What I would like to be able to
do is write lines such as:

    tree t;

    t[0] = malloc(sizeof(tree));
    t[0][1] = malloc(sizeof(tree));
         .
         .
         .

The closest I have been able to do is:

    typedef struct _tree {
        struct _tree *t;
    } tree[2];

    tree t;

    t[0].t = malloc(sizeof(tree));
    t[0].t[1].t = malloc(sizeof(tree));
        .
        .
        .

Which is *not* what I am after.  Just to pique interest, I add that
PASCAL (blech) *allows* this construct.  How can this be done in C?

Thanks,
Rick

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answer then keep your (computer) shut!