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POJava programmer - how do C++ people use classes? Pointers to classes, default parameters?
 

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  1. POJava programmer - how do C++ people use classes? Pointers to classes, default parameters?
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    <p>I know my way around object-oriented programming, but I'm used to Java, and I never touched C++ until recently. </p> <p>I think my problem is not so much related to syntax as to the philosophy of OOP in C++. I understand the difference between pointers and addresses and the stack and the heap, and stuff, but I still feel like I'm missing something.</p> <p>Here's an example: I have a class (Shape) that holds some data. I have another class (App) using a number of Shapes. </p> <pre><code>class Square { private: int x; int y; int size; public: /* constructor */ Square(int x, int y, int size); } class App { private: Square redSquare; Square blueSquare; public: void setup(); void draw(); } </code></pre> <p>At some point something is going to instantiate my App and call setup(). The problem is that when I declare the App class (in App.hpp, say) the "redSquare" and "blueSquare" get instantiated, not just declared. Being a Java programmer, I would in this example instantiate my classes in setup(). But thatmeans I can't do it as above, I'll have to set up redSquare and blueSquare as POINTERS, then I can create them using new in setup(). </p> <p>But is that how you would do it? Or would you make a constructor with default parameters, create the redSquare and blueSquare as above, and then set the values of those squares in App.setup(), using something like a Square.init(x, y, size) or something? Or some other way? </p> <p>Do you ever aggregate classes, or only pointers?</p> <p>I can certainly hack this one way or the other so it works myself, but I have a feeling I'm doing things "the Java way" and not getting how C++ programmers think.</p>
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