Call fortran in C++ project

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.

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).

On Apr 1, 2:47 am, Craig Powers <eni...@hal-pc.org> wrote:
> FlyVenus wrote: 
> 
>
> 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++.
> 
>
> 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).=[/color
]


Thank you.
I use the Intel=AE Visual Fortran Compiler. And the bad news is the
TYPEs contain lots of pointers...

On Mon, 31 Mar 2008 18:33:05 -0700 (PDT), FlyVenus <duguguiyu@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
[url]http://softwarecommunity.intel.com/isn/Community/en-US/forums/1005/ShowForum.aspx[
/url]
--
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/pe...cetools/fortran
My Fortran blog
http://www.intel.com/software/drfortran

FlyVenus wrote:
> On Apr 1, 2:47 am, Craig Powers <eni...@hal-pc.org> wrote: 
>
> 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++.

On Tue, 01 Apr 2008 13:32:14 -0400, Craig Powers <enigma@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 feature
s.
Give the derived type the BIND(C) attribute and have it contain components o
f
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/pe...cetools/fortran
My Fortran blog
http://www.intel.com/software/drfortran