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From: FlyVenus on 30 Mar 2008 23:08
Hi, All:
I plan to using a fortran 90 program in C++. I have no experience
about that, and I have some question about that.

1. I think I have two methods to using the fortran 90 program.
First, compile all the .f90 and .cpp to .obj, and link them. Second,
make the fortran 90 program to a dll, and call it in C++ project. I
want to know, which is better, and how I should do?
2. In the fortran 90 program, there many Types. How can I using
them in C++.

Thank you very much.
From: FlyVenus on 31 Mar 2008 21:33
On Apr 1, 2:47 am, Craig Powers <eni...(a)hal-pc.org> wrote:
> FlyVenus wrote:
> > Hi, All:
> > I plan to using a fortran 90 program in C++. I have no experience
> > about that, and I have some question about that.
>
> > 1. I think I have two methods to using the fortran 90 program.
> > First, compile all the .f90 and .cpp to .obj, and link them. Second,
> > make the fortran 90 program to a dll, and call it in C++ project. I
> > want to know, which is better, and how I should do?
>
> The second method is likely to involve less pain in terms of figuring
> out which linker to use, etc. You will still need to use the manual for
> your Fortran compiler to make sure that your Fortran routine in the dll
> is designed correctly to be called from C++.
>
> > 2. In the fortran 90 program, there many Types. How can I using
> > them in C++.
>
> See the manual for your Fortran compiler on mixed language programming.
> Possibly, all you will need to do is specify SEQUENCE and make sure
> that the TYPEs are compatible with C++ (i.e. no pointers or allocatables).

Thank you.
I use the Intel® Visual Fortran Compiler. And the bad news is the
TYPEs contain lots of pointers...
From: Steve Lionel on 1 Apr 2008 09:43
On Mon, 31 Mar 2008 18:33:05 -0700 (PDT), FlyVenus <duguguiyu(a)gmail.com>
wrote:

>I use the Intel� Visual Fortran Compiler. And the bad news is the
>TYPEs contain lots of pointers...

There is a detailed chapter in the Intel Visual Fortran documentation on
mixed-language programming. You should also look at the Fortran 2003 C
Interoperability features supported by that compiler. The use of pointers is
not necessarily a big problem.

If you need more help, feel free to ask in the Intel user forum at
http://softwarecommunity.intel.com/isn/Community/en-US/forums/1005/ShowForum.aspx
--
Steve Lionel
Developer Products Division
Intel Corporation
Nashua, NH

For email address, replace "invalid" with "com"

User communities for Intel Software Development Products
http://softwareforums.intel.com/
Intel Fortran Support
http://support.intel.com/support/performancetools/fortran
My Fortran blog
http://www.intel.com/software/drfortran
From: Craig Powers on 1 Apr 2008 13:32
FlyVenus wrote:
> On Apr 1, 2:47 am, Craig Powers <eni...(a)hal-pc.org> wrote:
>> FlyVenus wrote:
>>> Hi, All:
>>> I plan to using a fortran 90 program in C++. I have no experience
>>> about that, and I have some question about that.
>>> 1. I think I have two methods to using the fortran 90 program.
>>> First, compile all the .f90 and .cpp to .obj, and link them. Second,
>>> make the fortran 90 program to a dll, and call it in C++ project. I
>>> want to know, which is better, and how I should do?
>> The second method is likely to involve less pain in terms of figuring
>> out which linker to use, etc. You will still need to use the manual for
>> your Fortran compiler to make sure that your Fortran routine in the dll
>> is designed correctly to be called from C++.
>>
>>> 2. In the fortran 90 program, there many Types. How can I using
>>> them in C++.
>> See the manual for your Fortran compiler on mixed language programming.
>> Possibly, all you will need to do is specify SEQUENCE and make sure
>> that the TYPEs are compatible with C++ (i.e. no pointers or allocatables).
>
> Thank you.
> I use the Intel� Visual Fortran Compiler. And the bad news is the
> TYPEs contain lots of pointers...

If they have POINTERs in them, then I would think they'll be pretty much
impossible to use directly in C++ without making the C++ code dependent
on the IVF "dope vector" implementation (which is possible, but
undesirable due to extreme lack of portability). However, it may be
possible to come up with a scheme where the objects are managed in
Fortran, with an interface to manipulate them that is exposed to C++.
From: Steve Lionel on 1 Apr 2008 13:45
On Tue, 01 Apr 2008 13:32:14 -0400, Craig Powers <enigma(a)hal-pc.org> wrote:

>If they have POINTERs in them, then I would think they'll be pretty much
>impossible to use directly in C++ without making the C++ code dependent
>on the IVF "dope vector" implementation (which is possible, but
>undesirable due to extreme lack of portability). However, it may be
>possible to come up with a scheme where the objects are managed in
>Fortran, with an interface to manipulate them that is exposed to C++.

My advice, if one has the flexibility, is to use the F2003 C Interop features.
Give the derived type the BIND(C) attribute and have it contain components of
TYPE(C_PTR). One can use functions in ISO_C_BINDING to convert between that
and Fortran POINTER. This is supported by IVF and is portable (to other
compilers supporting this F2003 feature.)

--
Steve Lionel
Developer Products Division
Intel Corporation
Nashua, NH

For email address, replace "invalid" with "com"

User communities for Intel Software Development Products
http://softwareforums.intel.com/
Intel Fortran Support
http://support.intel.com/support/performancetools/fortran
My Fortran blog
http://www.intel.com/software/drfortran
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