[Soplex] Compiling with c++20

[Leon Eifler]

Hello Salome,

personally, I don't see a reason why we should not implement this 
change, as long as it does not pose any problems with earlier c++ 
standards (which I don't think it will and I also don't think it will 
change the interface).

Could you possibly create a pull-request on github? 
https://github.com/scipopt/soplex

Best,
Leon

Am 2/4/2023 um 3:23 PM schrieb Salome Eriksson:
> Dear SoPlex developers
>
> Currently SoPlex cannot be used as a library when compiling with 
> c++20, since adding the template parameter to the constructor of a 
> templated class is no longer permitted 
> (https://cplusplus.github.io/CWG/issues/2237.html), but SoPlex uses 
> this in several header files.
> I added a diff to the header files as attachment showing the changes 
> we performed to the include files of the library in order to compile 
> code with c++20 that includes soplex.h.
>
> Our code base Fast Downward (https://www.fast-downward.org/) is built 
> with support for using SoPlex as a LP solver through the OSI 
> interface. However, we recently upgraded our c++ standard to c++20, 
> and want to remove OSI and instead directly communicate with the 
> SoPlex library, but with the current (and older) release we cannot do 
> this. I thus wanted to inquire if you would consider adding this patch 
> in your next release.
>
> Best regards,
> Salomé Eriksson
>
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