HP C/aC++ for PA-RISC Software manual Compiling and Running the Sample Programs

//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