Hi, Are the OO capabilities of Fortran 2018 are as robust as C++? Of course I am not speaking about ‘templates’. By robust I mean - any OO mechanism that is implemented in C++ can also be implemented in Fortran and with minimum loss in performance ? I am working in the area of Finite Element Analy…

The following papers make the case that modern Fortran OO is more than adequate for writing OO based Finite Element codes. There have probably been others since these were published. Badia et al, “FEMPAR: An Object-Oriented Parallel Finite Element Framework,” Archives of Computational Methods i…

The ElmerFEM ( GitHub - ElmerCSC/elmerfem: Official git repository of Elmer FEM software ) finite element software suite is also mostly Fortran along with some C and C++.

[image] septc: I have no experience with FEM codes so not sure at all, but if they use multiple inheritance (for any purpose), I guess one needs to think some workarounds because it is not supported by Fortran OO. I posted a paper Emulating Multiple Inheritance in Fortran 2003/2008 but am un…

Thank you @Beliavsky , @ivanpribec , @septc , @rwmsu . May be I will take some time off and get into OOP in Fortran.

difference-scheme: Some would say that C++ has an advantage over Fortran in that it offers multiple implementation inheritance. But that is a red herring as implementation inheritance (both single and multiple) is an anti-pattern that should be avoided at all cost in both languages. So, regard…

Thanks a lot @difference-scheme for your detailed answer. I will try to emulate the best practices that you have shown here.

@difference-scheme , @septc would you be interested in helping the generics subgroup of the Fortran Standards Committee with designing “traits” / generics for Fortran? The main repository is here: GitHub - j3-fortran/generics , here are some overview documents: generics/comparison.md at 2d3f08078b…

Two cents from a finite element programmer: OOP is not magic. It is only a style of organization. It sometimes suits the problem naturally, though less often than many people think. I have seen many unnecessary classes in FEM codes. It is natural to have classes for element, nodes or even shape fu…

My thanks also to @difference-scheme for his detailed explanation and hopefully his standard proposal will be given serious consideration. Maybe someone who was on J3 at the time the OOP facility was being designed can enlighten us as to why certain choices were made particulary why we ended up with…

difference-scheme: @septc ’s comments on the Yuan & Fish (2015) paper have brought up a number of excellent points that haven’t received so far the attention they deserve … The section 2.2. The limitation of the OOP in Fortran 2003 in the paper by Yuan and Fish (2015) can be taken literally a…

OO capabilities of Fortran 2018 vs c++

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Beliavsky April 17, 2021, 10:45pm 5

I posted a paper Emulating Multiple Inheritance in Fortran 2003/2008 but am unqualified to evaluate it, as a Fortranner without CLASS.

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OO capabilities of Fortran 2018 vs c++

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