Re: Does anybody know why boost::array does not support multiple dimensions?

From: Andrzej Krzemienski (akrzemi1_at_[hidden])
Date: 2022-01-01 13:10:44

sob., 1 sty 2022 o 11:42 Ivan Matek via Boost <boost_at_[hidden]>
napisał(a):

> I don't know much about library development, but with variadic templates
> does not seem so hard, although every library development is much harder
> than regular user code.
>
> Sure boost::array probably wants to support ancient compilers, but variadic
> version could exist only for "modern"(I do not consider >10y old standards
> modern) C++.
>
> I found this std:: proposal
> http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3794.html#Ch05
> from 9 y ago,
> also author seemed to have some working impl on github
> https://github.com/CTMacUser/ArrayMD/tree/master/include/boost/container
>
> But I guess none of it ever progressed.
>
> Does anybody knows more about this?
> It is not trivial since there are probably a ton of edge cases, typdefs,
> semantics(what should size return?, I would say array of dims) to deal
> with, but I think it would be a nice extension since I find nested
> std::array hideous (with current syntax), e.g.:
>
> std::array<std::array<int,3>, 4> arr;
>
> I would like to have this
> boost::array<int,4,3> arr;
>
> P.S. I know I can use Eigen or some other library, but I think if not std
> then at least boost should support simple way to have multidim arrays.
>

What is your use case?

Maybe you are looking for a matrix or tensor library?
Maybe Boost Basic Linear Algebra would work for you?
https://www.boost.org/doc/libs/1_78_0/libs/numeric/ublas/doc/index.html

Regards,
&rzej;

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