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

Subject: Re: [boost] [array] Support for multidimensional arrays?
From: Larry Evans (cppljevans_at_[hidden])
Date: 2015-05-10 15:07:05

On 05/06/2015 04:01 PM, Brian Smith wrote:
> 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
> 
+1
I'm curious about this also.

Larry