HP aC++/HP C A.06.28 Programmer's Guide Integrity servers (769150-001, March 2014)

// C interface routine to initialize an
// object by calling the constructor.
void initialize_obj(obj_ptr& p) {
p = new obj;
}
// C interface routine to destroy an
// object by calling the destructor.
void delete_obj(obj_ptr p) {
delete p;
}
// C interface routine to display
// manipulating the object.
void print_obj(obj_ptr p) {
cout << “the value of object->x is “ << p->x << “\n”;
}
Following is a C program that calls the C++ module to manipulate an object:
/***************************************************/
/* C program to demonstrate an interface to the */
/* C++ module. Note that the application needs */
/* to be linked with the aCC driver. */
/***************************************************/
typedef struct obj* obj_ptr;
int main () {
/* C++ object. Notice that none of the
routines should try to manipulate the fields.
*/
obj_ptr f;
/* The first executable statement needs to be a call
to _main so that static objects will be created in
libraries that have constructors defined. In this
application, the stream library contains data
elements that match the conditions.
*/
/* NOTE: In 64-bit mode, you MUST NOT call _main. */
#if !defined(__LP64__) && !defined(__ia64)
_main();
#endif
/* Initialize the data object. Notice taking
the address of f is compatible with the
C++ reference construct.
*/
initialize_obj(&f);
/* Call the routine to manipulate the fields */
print_obj(f);
/* Destroy the data object */
delete_obj(f);
}
Compiling and Running the Sample Programs
To compile the example, run the following commands:
cc -ccfilename.c
aCC -cC++filename.C
192 Mixing C++ with Other Languages