Re: [eigen] On a flexible API for submatrices, slicing, indexing, masking, etc.

[Andre Krause <post@xxxxxxxxxxxxxxxx>]

> 
>     There are more downsides:
>     - c++14 only
>     - does not work with template parameters as in: template<class T>
>     void foo() { span(i,c<T::Bar>); }
> 

Is it possible to modularize eigen in a way, so that users of older
compilers can just leave away the submatrix api, while others can
benefit from the rapidly evolving advances in C++14 and beyond ?

or would it be easier to require >= c++14 from eigen4.0 onwards ?
i personally think it would be a pity to miss on all the new
opportunities that c++14 / c++17 has to offer.