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From: Ole-Hjalmar Kristensen <ole-hjalmar.kristensen@sun.com>
Newsgroups: comp.lang.ada
Subject: Re: Counter-proposal for variable arrays
Date: 07 Oct 2003 11:23:39 +0200
Organization: Sun Microsystems
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>>>>> "PO" == Pascal Obry <p.obry@wanadoo.fr> writes:

    PO> Hyman Rosen <hyrosen@mail.com> writes:

    >> C++ has arrays. 

    PO> No it has pointers.

    >> Making obviously wrong statements about C++ is silly.

    PO> I can send you the same compliment! Or maybe we have a different definition
    PO> of array.

    PO>    char ptr1[156];
    PO>    char ptr2[156];

    PO>    ptr1 = ptr2;

    PO> Just copy the "pointer" ptr2 to ptr1. That's my point. Array is not a first
    PO> class citizen in C++, just "emulated" with pointers. To pass such "array" into
    PO> a procedure you can say:

It would be a good idea to check your facts before posting. Arrays are
*constant* pointers, so the assignment above will not compile.

But I agree that arrays are not first class citizens in C/C++.
The relationship with pointers is obvious if you look at the following
relationship, which always holds:

x[13] == *(x+13) == *(13+x) == 13[x] !!!!

    PO>    void proc (char *ptr);

    PO> And into ptr you can pass objects such as:

    PO>    ptr1        

    PO>    new char[12]

Yes, there is no range check, just like Fortran.

    PO>    "whatever"

Yes, like Ada, C strings are arrays of characters :-)

    PO> Call this array if you like.

I do, the C array is essentially the same as early Fortran, and being
brainwashed by the Univac Fortran compiler at an early age, I cannot
see why this is not an array. You just have to keep track of the
bounds yourself.

    PO> Pascal.

    PO> -- 

    PO> --|------------------------------------------------------
    PO> --| Pascal Obry                           Team-Ada Member
    PO> --| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
    PO> --|------------------------------------------------------
    PO> --|         http://perso.wanadoo.fr/pascal.obry
    PO> --| "The best way to travel is by means of imagination"
    PO> --|
    PO> --| gpg --keyserver wwwkeys.pgp.net --recv-key C1082595

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