Re: Problem with calling C++ from Fortran

Path	csiph.com!weretis.net!feeder8.news.weretis.net!eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From	Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.c++
Subject	Re: Problem with calling C++ from Fortran
Date	Tue, 12 Sep 2023 14:14:03 +0100
Organization	A noiseless patient Spider
Lines	34
Message-ID	<87cyynpm90.fsf@bsb.me.uk> (permalink)
References	<udhbs9$e5d$1@dont-email.me> <udhcaj$j8l$1@dont-email.me> <udkdu9$itm4$1@dont-email.me> <87o7iajh8b.fsf@bsb.me.uk> <udmvg7$11r4u$1@dont-email.me> <87cyyoqoka.fsf@bsb.me.uk> <udp8l4$1frsv$1@dont-email.me>
MIME-Version	1.0
Content-Type	text/plain
Injection-Info	dont-email.me; posting-host="0b3d05af22d1f5f0f239039facdde43d"; logging-data="1662275"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+FP35JNpikUtB3e/UOXxHz5Hv5DCQsVPo="
User-Agent	Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux)
Cancel-Lock	sha1:QxxxAqkfrnWkfwMM/Rkesk9UfPU= sha1:LE+fr7O5G7yMYT2HHUUwTTzRrG8=
X-BSB-Auth	1.3a07ebe5454fef238a8e.20230912141403BST.87cyynpm90.fsf@bsb.me.uk
Xref	csiph.com comp.lang.c++:91700

Show key headers only | View raw

db <dieterhansbritz@gmail.com> writes:

>> BTW, you said the C++ was written by a C++ expert.  I don't think it
>> was!
>> 
> The code, apart from the extra lines suggested by someone here,
> but without the information on where to put them, is runnable
> C++ code written by another person who knows C++ very well.

I was just saying that the code does not look like it was written by
someone who knows C++ very well.  All those unnecessary duplicated
sizes.  A const qualified function return type.  Including "math.h"
rather that either <math.h> or <cmath>.

> I myself use Fortran and you are right, I know next to nothing about
> C++.

Did I say that?  Sorry.

> I did use the extra code exactly as is, but possibly
> put it in the wrong place. I tried two, without success.
> I am giving up, and will translate the C++ function into Fortran,
> where I know what I'm doing.

OK.  Odd to give up just as two people have given you working code.  Oh
well...

Mind you, the C++ (or C) just picks an array and an initial value (an
'x' in a polynomial evaluation) and calculates a simple sum.  It will be
trivial in Fortran.  The hard work is in the coefficients and those can
just be coped.

-- 
Ben.

Thread

Problem with calling C++ from Fortran db <dieterhansbritz@gmail.com> - 2023-09-09 10:54 +0200
  Re: Problem with calling C++ from Fortran Muttley@dastardlyhq.com - 2023-09-09 09:02 +0000
    Re: Problem with calling C++ from Fortran db <dieterhansbritz@gmail.com> - 2023-09-09 12:47 +0200
      Re: Problem with calling C++ from Fortran Muttley@dastardlyhq.com - 2023-09-09 10:51 +0000
      Re: Problem with calling C++ from Fortran db <dieterhansbritz@gmail.com> - 2023-09-09 12:52 +0200
        Re: Problem with calling C++ from Fortran Muttley@dastardlyhq.com - 2023-09-09 11:00 +0000
          Re: Problem with calling C++ from Fortran db <dieterhansbritz@gmail.com> - 2023-09-10 14:33 +0200
            Re: Problem with calling C++ from Fortran Paavo Helde <eesnimi@osa.pri.ee> - 2023-09-10 18:49 +0300
            Re: Problem with calling C++ from Fortran Muttley@dastardlyhq.com - 2023-09-11 08:23 +0000
        Re: Problem with calling C++ from Fortran Paavo Helde <eesnimi@osa.pri.ee> - 2023-09-09 16:56 +0300
          Re: Problem with calling C++ from Fortran db <dieterhansbritz@gmail.com> - 2023-09-10 14:36 +0200
          Re: Problem with calling C++ from Fortran James Kuyper <jameskuyper@alumni.caltech.edu> - 2023-09-11 00:14 -0400
        Re: Problem with calling C++ from Fortran Bo Persson <bo@bo-persson.se> - 2023-09-10 16:08 +0200
      Re: Problem with calling C++ from Fortran "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2023-09-09 16:30 +0200
    Re: Problem with calling C++ from Fortran db <dieterhansbritz@gmail.com> - 2023-09-10 14:48 +0200
      Re: Problem with calling C++ from Fortran Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-09-10 14:22 +0100
        Re: Problem with calling C++ from Fortran Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-09-10 17:27 +0100
        Re: Problem with calling C++ from Fortran db <dieterhansbritz@gmail.com> - 2023-09-11 14:00 +0200
          Re: Problem with calling C++ from Fortran Michael S <already5chosen@yahoo.com> - 2023-09-11 05:21 -0700
          Re: Problem with calling C++ from Fortran Muttley@dastardlyhq.com - 2023-09-11 13:33 +0000
          Re: Problem with calling C++ from Fortran Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-09-12 00:26 +0100
            Re: Problem with calling C++ from Fortran db <dieterhansbritz@gmail.com> - 2023-09-12 10:48 +0200
              Re: Problem with calling C++ from Fortran Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-09-12 14:14 +0100
              Re: Problem with calling C++ from Fortran Michael S <already5chosen@yahoo.com> - 2023-09-12 07:15 -0700
            Re: Problem with calling C++ from Fortran Michael S <already5chosen@yahoo.com> - 2023-09-12 02:00 -0700
              Re: Problem with calling C++ from Fortran Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-09-12 14:22 +0100
                Re: Problem with calling C++ from Fortran Michael S <already5chosen@yahoo.com> - 2023-09-12 07:32 -0700
                Re: Problem with calling C++ from Fortran db <dieterhansbritz@gmail.com> - 2023-09-12 18:36 +0200
                Re: Problem with calling C++ from Fortran Michael S <already5chosen@yahoo.com> - 2023-09-19 02:39 -0700
  Re: Problem with calling C++ from Fortran Michael S <already5chosen@yahoo.com> - 2023-09-10 08:38 -0700
  Re: Problem with calling C++ from Fortran Michael S <already5chosen@yahoo.com> - 2023-09-10 09:51 -0700
    Re: Problem with calling C++ from Fortran Michael S <already5chosen@yahoo.com> - 2023-09-11 02:49 -0700
  Buy Zen Mushroom Chocolate Bar Microdose "https://psychedelicminds.shop/" <psychedelicsmind@gmail.com> - 2023-09-11 05:14 -0700

csiph-web