Re: [boost] [array] Support for multidimensional arrays?

Subject: Re: [boost] [array] Support for multidimensional arrays?
From: Brian Smith (bjs3141_at_[hidden])
Date: 2015-05-06 17:01:22

On 5/6/15, Peter Dimov <lists_at_[hidden]> wrote:
> Currently, creating a multidimensional boost/std::array is a bit unwieldy:
>
>     array<array<array<int, 5>, 4>, 3> a; // int a[3][4][5]
>     a[2][3][4] = 5;
>
> As a first step, we should consider enabling the element type T of array<T,
>
> N> to be an array type.
>
>     array<int[4][5], 3> a; // int a[3][4][5]
>     a[2][3][4] = 5;
>
> This almost works already, except for the array interface functions
> specified and implemented in terms of, say, std::equal or std::fill.
>
> It is an open question whether these standard algorithms should not be fixed
>
> themselves to work on array types, as swap_ranges has been, but for now, we
>
> can implement the array functions in a way that works.
>
> Opinions on that part?
>
> If we agree that this is a good idea, the next logical step would be to
> eliminate the special handling of the first extent and simply allow
>
>     array<int[3][4][5]> a; // int a[3][4][5]
>     a[2][3][4] = 5;
>

There's a multidimensional array submitted for review at
https://github.com/BrianJSmith/Array. The syntax is array<int, 3,4,5
>, iteration is over each dimension, if that would suit your needs.

Brian

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