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I found several fragments of examples, but I confess it took me a while to get everything in place for a complete working example. I offer this code to help anyone else in the same boat, and to invite corrections or improvements (in particular I'm not at all confident I am handling the character array well)
The FORTRAN piece is built into a static library and this is the essence of it (sorry for the mixed case!):
-------------------------------------------------------
subroutine ReceiveFromC(cstruct) BIND(C,name='ReceiveFromC')
USE, INTRINSIC :: ISO_C_BINDING
implicit none
TYPE, BIND(C) :: MYFTYPE
INTEGER(C_INT) :: I, J
REAL(C_FLOAT) :: S
real(C_DOUBLE) :: D
character(kind = C_CHAR, LEN =15):: T
END TYPE MYFTYPE
TYPE (MYFTYPE) :: cstruct
integer idum, jdum
real rdum
double precision ddum
character (15) :: TDUM
idum = cstruct.i
jdum = cstruct.j
rdum = cstruct.s
ddum = cstruct.d
tdum = cstruct.t
end subroutine
---------------------------------------------------
The C++ piece looks like this:
struct thecstruct {
int m, n;
float r;
double d;
char c[15];
};
extern "C" {void ReceiveFromC(thecstruct*); };
void Calculator::PassToFortran()
{
thecstruct *mycstruct = new thecstruct;
mycstruct->m = 11;
mycstruct->n = 12;
mycstruct->r = 1.5;
mycstruct->d = 2.5;
char* dum = "spacepadded ";
for (int i = 0; i<15 ; i++)
{
mycstruct->c = dum ;
}
ReceiveFromC(mycstruct);
delete mycstruct;
}
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I'll also ding you for using dot as a component separator instead of % in the Fortran.
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I'm interpreting your comment on component T as meaning "this is going to work, but it's outside what the standard guarantees will work" - is that right?
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rase, the whole idea of the C Interoperability features in Fortran 2003 was to eliminate that uncertainty. There are several textbooks on Fortran 2003 that describe these features, or you can read the standard - a link is on this forum's main page. I hope that most of these features will be documented for Intel Fortran in the next major release, but that will be reference information and not tutorial in nature.
I will comment that not everything you can express in C can be expressed in standard Fortran, and vice-versa. In the case of dynamic allocation, the type C_PTR is provided to be interoperable with a C pointer, but Fortran allocatable arrays are not interoperable, on their own, with C. The standard does provide such features as C_F_POINTER and C_LOC to convert between C pointers and Fortran pointers and these can be very powerful.
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