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c++pointersidebada

samsung bada development without using pointers

Objects in C++ can be created using the methods listed below(that I am aware of): 

Person p;

or

Person p("foobar");

or

Person * p = new Person();

Then, why does not the Samsung Bada IDE allow me to do the first two methods? Why do I always have to use pointers? I am ok with using pointers and all, just that I want to know the fundamental reason behind the style.

Sample code from Bada API reference.

// Create a Label
Label *pLabel = new Label();
pLabel->Construct(Rectangle(50, 200, 150, 40), L"Text");
pLabel->SetBackgroundColor(Color::COLOR_BLUE);
AddControl(*pLabel);

I modified and tried using the code below. Although it compiles and the app runs, the label does not show up on the form.

// Create a Label
Label pLabel();
pLabel.Construct(Rectangle(50, 200, 150, 40), L"Text");
pLabel.SetBackgroundColor(Color::COLOR_BLUE);
AddControl(pLabel);

Note : Rectangle class which is used creates an object on the fly without pointer. How is it different from Label then? Its confusing :-/

Solution

  • In this code:

    // Create a Label
Label pLabel;
pLabel.Construct(Rectangle(50, 200, 150, 40), L"Text");
pLabel.SetBackgroundColor(Color::COLOR_BLUE);
AddControl(pLabel);

    the label object is destroyed when it goes out of scope and hence it fails to show up on the form. It is unfortunate that the AddControl method takes a reference as that implies that the above should work. Using:

    Label *pLabel = new Label();

    works because the destructor is not called by default when the pLabel variable goes out of scope.