Question

Hi I have a class which includes an array, I’m not passing this through my class constuctor (could be going wrong here?) The array is just defined in the class then initialized in a read method.

But in the main I make an instance of the class like:

myClass myClass1;

Then do:

myClass1 = myClass2;

Now I use a bubble sort method on the first class instance like:

MyClass1.sort();

Now when I write both of these instances out to text after the sort they are both sorted?

I have had a read into shallow and deep copys, but I can’t understand why a method called after the shallow copy, would result in both of them being sorted? Is this expected behavoir?

a little more information:

In my class I just define the array as:

static string myArray[5];

then in a write method I write the 5 elements to it, is there a better way of doing this, I have to use a method to intialize it though.

Answer 1

In my class I just define the array as:

static string myArray[5];

Should I declare it in the header, as its only declared in the cpp file? As its still copying both.

If you declare that outside of a class definition it will be a global variable. There will only be one instance of it. You need to declare it inside the class, and not static:

class MyClass1 {
    // other things...
    string myArray[5];
};

In any case, this kind of basic question is better answered by consulting a good C++ introductory book.