the arrow '->' separator is crashing when calling function from class

Question

I\'m working on a project for class and I\'m using classes and pointers of type class to call some functions in the class but it\'s crashing on Code Blocks and Eclipse and I don

Answer 1

You have just declared a pointer variable of type a* but it doesn't point to a valid memory address. And since you are calling a member function via that pointer which updates a data-member hence you have segfault because this pointer is NULL.

You must initialize pointer with some valid memory address of class a object.

Following can be done,

a* ptr = new a;
ptr->set_X(5);
// ...
delete ptr;

In this case. It would be better that you should use some smart_ptr like std::shared_ptr or std::unique_ptr so that you don't need to worry about releasing resources manually.

Or

   a* ptr;
   a aobj_;
   ptr = &aobj_;
   ptr->set_X(5);