Re: multidimension arrays with unknown bounds

From:
"Balog Pal" <pasa@lib.hu>
Newsgroups:
comp.lang.c++
Date:
Wed, 18 May 2011 12:52:58 +0200
Message-ID:
<ir08ek$lfc$1@news.ett.com.ua>
"Andy Gibbs" <andyg1001_nospamthnaks@hotmail.co.uk>

template <typename X>
struct add { typedef X type[]; };

typedef typename add<typename add<int>::type>::type array_t;

void test(array_t& arg);

... and this *does* create a multidimensional array with unknown bounds.
It still errors on the function prototype: "error: parameter 'arg'
includes reference to array of unknown bound 'int [][]'" so while
interesting it is not much obvious use.

My question is this: have I simply managed to temporarily confuse the
compiler, or is there some (maybe obscure) part of the language that
allows multidimensional arrays with unknown bounds in some way?


You did confuse gcc.

Cameau (http://www.comeaucomputing.com/tryitout/) flags your typedef
attempt:

"ComeauTest.c", line 2: error: an array may not have elements of this type
  struct add { typedef X type[]; };
                         ^
          detected during instantiation of class "add<X> [with X=int []]" at
                    line 4

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