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From: Cem Bassoy (cem.bassoy_at_[hidden])
Date: 2020-03-20 11:08:36

Am Do., 19. März 2020 um 18:36 Uhr schrieb Ashar via ublas <

>> 1. (not part as gsoc) make a final decision about yapp
>> 2. stablilize and improve the code from the previous gsoc
>> implementation (static rank and extents, subtensor)
>> 3. improve code quality using advanced and modern toolchains like
>> cmake, clang-static-analyzer, clang-tidy, etc.
>> 4. improve code quality by enhancing the code-covarge percentage for
>> tensor only
>> 5. improve the constexpr-ness of tensor and subtensor (finalization
>> with C++17)
>> 6. prepare a matrix and vector data structures as an instance of
>> tensor<T,rank=2> and tensor<T,rank=1>
>> 7. using a different branch, improve code quality using c++20
>> contracts and attributes for tensor, using (expects,ensure,assert)
>> contract
>> <>
>> 8. prepare for concepts
>> Hey Cem,
> Are you sure to add contracts in uBLAS. Contracts was proposed for C++17
> and did not made it up to C++20 and I have no idea when it will come to but
> there are some implementation of contracts TS draft by some third party
> compiler hackers who implement things, So I will have to compile the
> compiler with contract support and then test it during development. I have
> no problems doing it, I can see all the great places it will be used.
> Will it be worth doing something that can't be directly used by other?

you are right about contracts.

> In addition to the above, I was thinking of also having complete compile
> time tensor. c++20 has new and delete marked constexpr, so we can use
> std::vector container which is now compile-time and modify current to have
> a complete compile time tensor class. With examples and how to use it, this
> will be easy, if I use Amit's static extents. This is I believe an
> extension to the list of ideas you presented above.

yes. doumenting and stablizing the software and preparing it for matrix and
vector templates would be the number one priority.

> I still need your view on if I should go ahead with the contracts?
> Concepts are okay and So is constexpr thing!

for now, I would like to put concepts at the very end of the

> Also I believe eventually if I follow up your list of ideas tensor<2,
> rank> can be matrix and tensor<1, rank> can become a vector and in a long
> run it can replace the specially designed matrix and vector of ublas.
> (backward compatibility could be provided thought).

yes. according to the list that is the way we should go.

> We will have one expression template (YAP), C++17 or 20 everywhere, it
> will also make maintaining the library easy because currently tensor is a
> separate things and matrix and vector of ublas are separator thing.


> This will also eventually give us many performance boost that David was
> talking about from modern paradigms of C++.
> Regards
> Ashar
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