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devel / comp.lang.fortran / Re: Tool for C++ 2 FORTRAN?

SubjectAuthor
* Tool for C++ 2 FORTRAN?Arjan
+* Re: Tool for C++ 2 FORTRAN?Sjouke Burry
|`* Re: Tool for C++ 2 FORTRAN?Arjan
| `- Re: Tool for C++ 2 FORTRAN?FortranFan
+- Re: Tool for C++ 2 FORTRAN?Thomas Koenig
`* Re: Tool for C++ 2 FORTRAN?Beliavsky
 `- Re: Tool for C++ 2 FORTRAN?David Duffy

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Tool for C++ 2 FORTRAN?

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Subject: Tool for C++ 2 FORTRAN?
From: arjan.van.dijk@rivm.nl (Arjan)
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 by: Arjan - Fri, 27 May 2022 06:02 UTC

Hi, is there a good tool to convert a C++ project to FORTRAN?

Re: Tool for C++ 2 FORTRAN?

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Date: Fri, 27 May 2022 08:43:22 +0200
From: burrynulnulfour@ppllaanneett.nnll (Sjouke Burry)
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 by: Sjouke Burry - Fri, 27 May 2022 06:43 UTC

On 27.05.22 8:02, Arjan wrote:
> Hi, is there a good tool to convert a C++ project to FORTRAN?
>
Try a human brain.
Those things can be very useful.

Re: Tool for C++ 2 FORTRAN?

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Subject: Re: Tool for C++ 2 FORTRAN?
From: arjan.van.dijk@rivm.nl (Arjan)
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 by: Arjan - Fri, 27 May 2022 07:45 UTC

Op vrijdag 27 mei 2022 om 08:43:26 UTC+2 schreef Sjouke Burry:
> On 27.05.22 8:02, Arjan wrote:
> > Hi, is there a good tool to convert a C++ project to FORTRAN?
> >
> Try a human brain.
> Those things can be very useful.

Of course.
But:
1: My brain does not have the knowledge yet and I miss the time to learn C++.
2: My project does not have the means to hire a person with a qualified brain.

A.

Re: Tool for C++ 2 FORTRAN?

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Newsgroups: comp.lang.fortran
Subject: Re: Tool for C++ 2 FORTRAN?
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 by: Thomas Koenig - Fri, 27 May 2022 09:52 UTC

Arjan <arjan.van.dijk@rivm.nl> schrieb:
> Hi, is there a good tool to convert a C++ project to FORTRAN?

My guess would be that it is almost impossible to do in a way
that is possible except at a very low level that it would be almost
iimpossible to maintain.

Consider one C++ feature, multiple inheritance - Fortran does
not have it (which is good), and there is no really clear way to
model it, unless you construct your vtabs by hand.

Re: Tool for C++ 2 FORTRAN?

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Subject: Re: Tool for C++ 2 FORTRAN?
From: parekhvs@gmail.com (FortranFan)
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 by: FortranFan - Fri, 27 May 2022 17:10 UTC

On Friday, May 27, 2022 at 3:45:38 AM UTC-4, Arjan wrote:
> Op vrijdag 27 mei 2022 om 08:43:26 UTC+2 schreef Sjouke Burry:
> > On 27.05.22 8:02, Arjan wrote:
> > > Hi, is there a good tool to convert a C++ project to FORTRAN?
> > >
> > Try a human brain.
> > Those things can be very useful.
> Of course.
> But:
> 1: My brain does not have the knowledge yet and I miss the time to learn C++.
> 2: My project does not have the means to hire a person with a qualified brain.
>
> A.

@Arjan,

First, a question: why "2 FORTRAN"?! Staring with ISO IEC standard document for this programming revision published in 1991, it has been "Fortran" e.g., the so-called "Fortran 90" revision to refer to that 1991 publication.

`FORTRAN` might come across as implying your interest in working with a prior version, say FORTRAN 77 and its nonstandard extensions. In year 2022, those who wish to work with such `FORTRAN` will be fewer in numbers!!

Secondly, you may want to consider "crowdsourcing" such an effort instead of seeking a tool.

For example, you can start a project on GitHub where you post the C++ code in question. Then you can request for help on this forum and also at the Fortran Discourse site (https://fortran-lang.discourse.group/) with translations to modern Fortran and chances are high several of the eager Fortran enthusiasts will chip away at the C++ code and assist with authoring modern Fortran incarnation of what this C++ code does.

I suggest you give that a try, if you can.

Re: Tool for C++ 2 FORTRAN?

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Subject: Re: Tool for C++ 2 FORTRAN?
From: beliavsky@aol.com (Beliavsky)
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 by: Beliavsky - Fri, 27 May 2022 17:25 UTC

On Friday, May 27, 2022 at 2:02:31 AM UTC-4, Arjan wrote:
> Hi, is there a good tool to convert a C++ project to FORTRAN?

No, but you can create C interfaces to your code and call them from Fortran.
There are also tools such as SWIG https://github.com/swig-fortran and
shroud https://github.com/LLNL/shroud to make it easier to call C++
from Fortran.

Re: Tool for C++ 2 FORTRAN?

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From: davidD@qimr.edu.au (David Duffy)
Newsgroups: comp.lang.fortran
Subject: Re: Tool for C++ 2 FORTRAN?
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 by: David Duffy - Sat, 28 May 2022 01:36 UTC

Beliavsky <beliavsky@aol.com> wrote:
> Hi, is there a good tool to convert a C++ project to FORTRAN?

The Rose Compiler knows Fortran and C++ and can translate backwards and
forwards between languages. They don't give any examples specifically
for C++ to Fortran, as it seems to be more a toolkit or framework
for rolling your own:

https://github.com/rose-compiler/rose/wiki/How-to-create-a-translator

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