From: pa@see.signature.invalid   
      
   Michael S  wrote:   
      
   > > There is amplification in Annex J.2, roughly three pages   
   > > after the start of J.2.  You can search for "an array   
   > > subscript is out of range", where there is a clarifying   
   > > example.   
      
   > I see the following text:   
   > "An array subscript is out of range, even if an object is apparently   
   > accessible with the given subscript (as in the lvalue expression   
   > a[1][7] given the declaration int a[4][5]) (6.5.7)."   
      
      
   In numerical analysis it is often useful to flatten   
   multidimensional arrays. For example,   
      
       void initialize(int table[4][4])   
       {   
   	int *flat= &table[0][0];   
   	for (int i= 0; i<16; i++) flat[i]= i;   
       }   
      
   Accessing table[0][i] would have been UB according to appendix J.   
   Is going through flat[i] UB as well? Probably, and that's a shame.   
      
   --   
   pa at panix dot com   
      
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