Re: [eigen] About dropping C++03 compatibility

[Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>]

On 20/02/2019 08.04, Michael Hofmann wrote:
> [...]
>
> If you want a motivated base of people *maintaining and contributing
> to* Eigen, by all means, get the Eigen codebase modernized and greatly
> simplified in the progress! It makes a big difference.
> And it does seem to me that Eigen could use a more active community
> working on it. My personal impression of Eigen certainly has changed a
> bit in the last few years, as these obvious modernization tasks are
> not even attempted.

"Simplifying" the codebase by using C++14/17 would for many parts 
essentially mean to rewrite them --> _May_ save work in the long run, 
but not feasible or worth the effort for now.
Large parts of Eigen are complicated regardless of the standard we use.

> I have to admit I do not understand conservativism around moving a
> codebase along with the times. As someone else said before in this
> thread, older releases do not magically disappear! Anyone can still
> use them.

It is also an issue of having to maintain code bases which largely 
diverged. Currently, many bug fixes can simply be grafted to the 3.3 branch.

> Without having data to back this up, [...]

Perhaps we should conduct some kind of survey about
 * Which Eigen versions are currently used (3.1??, 3.2, 3.3, default)
 * What CPU/OS/Compiler/C++-standard/...
 * What modules of Eigen/what kind of problems/...
 * Most concerning issues/wanted features/...
 * ...

Anyone willing to collect questions and set this up? (Maybe start 
brainstorming questions in a new mail-thread)


Christoph




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