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Message-ID: <3CC6FEC2.B4017D7B@tdcadsl.dk>
Date: Wed, 24 Apr 2002 12:09:00 -0000
From: bjorn rohde jensen <shamus@tdcadsl.dk>
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To: gcc-help@gcc.gnu.org
Subject: Re: Array Initialization warnings
References: <3CC17386.5040608@keyed-upsoftware.com> <20020420155818.3c8ca837.liptak@isdd.sk> <3CC17545.E3E68FDE@tdcadsl.dk> <E170Q5w-00048L-00@smtp.web.de>
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Hi Sebastian,

 The real issue was the syntax of static initialisation
of multidimentional arrays, we just got a little side tracked.

Bjorn

Sebastian Huber wrote:
> 
> Hello,
> I think this identity between the dereference operator (is this the English
> translation?) and access via pointers is helpful:
> 
> T a [S_1][S_2]...[S_N];
> 
> a [i_1][i_2]...[i_n] <=> a
>         + i_1 * S_2 * ... * S_N_MINUS_1
>         + i_2 * S_3 * ... * S_N_MINUS_1
>         + ... +
>         + i_n
> 
> For example:
> 
> #include <iostream>
> 
> int main()
> {
>         int a [2][2][2][2] = {
>                 { { { 0, 1 }, { 2, 3} }, { { 4, 5 }, { 6, 7 } } },
>                 { { { 8, 9 }, { 10, 11} }, { { 12, 13 }, { 14, 15 } } }
>         };
>         for (int i = 0; i < 16; ++i) {
>                 cout << *(reinterpret_cast<int*>( a) + i) << endl;
>         }
>         std::cout << a [1][0][1][0]
>                 << " == "
>                 << *(reinterpret_cast<int*>( a) + 1 * 2 * 2 * 2 + 0 * 2 * 2 + 1 * 2 + 0)
>                 << endl;
>         return 0;
> }
> 
> Ciao Sebastian