🚀 go-pugleaf

During the summer I contacted ISE support staff about how to call
C++ from Eiffel.  They responsed that it was impossible because
there was no way to call the C++ constructor.  Since I have a C++
class interface to a mission critical C++ application one of my
co-workers researched and found a solution.  Add the following
routines to the C++ class:

ClassName * ClassName::init_object (void)
{
   ClassName *cp;

   if (!(cp = (ClassName *) malloc(sizeof(ClassName))))
      return NULL;
   *cp = ClassName();
   return cp;
}

void ClassName::free_object (ClassName *cp)
{
   free(cp);
}

Then compile the C++ class keeping the interm C file (use +i for
the CenterLine compiler).  Make note of the names of the C routines
corresponding to the C++ routines.  In C/Eiffel call the C routine
corresponding to ClassName::init_object then for the original C++
routines call the corresponding C routines with ClassName *cp as the
first parameter.
Note: In Eiffel it is possible to have ClassName::free_object called
with the object is garbage collected; inherit from MEMORY add redefine
dispose to call ClassName::free_object (note: use C version's name).
 
---------------------------------------------------------------
 Paul Des Rivieres   Senior Computer Analyst/Programmer
 Communications Security Establishment, Govt of Canada, Ottawa
 pdesrivi@cse.dnd.ca  Voice: (613)991-8796  Fax: (613)991-8811