overriding

I would like to subclass TToolBar with another class called MyTToolBar so that I can override a method. I'm new to Delphi, but after two hours of trying various methods, I can't get MyTToolBar to be used instead of TToolBar. I can't be the first person who's wanted to override a method on a visual component class. I come more from an Xcode background where subclassing a visual component is easy. You create a subclass (e.g., MySubclass) of a parent class (e.g., MySuperClass) and then just simply assign the subclass in the Interface Builder view of Xcode. The subclass is automatically recognized

Is it possible to create a wrapper around a function that has the exact same name as the original function? This would be very useful in circumstances where the user wants to do some additional checks on input variables before they are passed on to the built in function How to interrupt MATLAB IDE when it hangs on displaying very large array? Actually alternatively to slayton's answer you don't need to use openvar . If you define a function with the same name as a matlab function, it will shadow that function (i.e. be called instead). To then avoid recursively calling your own function, you

I have script wherein basename() is used 100-1000s of time, I was just thinking if we can override the function rather than changing the function name to something else in all scripts. The problem with basename() is that it doesnt works well with names of files in foreign languages. I found one on php site http://php.net/manual/en/function.override-function.php but it needs PECL any other alternative? You can use namespaces to override existing function names: namespace blarg; function basename() { return 'whatever'; } $base = basename(); I.e., any call to basename() within the blarg namespace

I have an abstract class that should implement a public field, this field is an interface or another abstract classe. something like this: public abstract class GenericContainer { public GenericChild child; } public abstract class GenericChild { public int prop1=1; } public abstract class SpecialChild extend GenericChild { public int prop1=2; } Now i have another specialized class Container: public abstract class SpecialContainer extends GenericContainer { public SpecialChild child=new SpecialChild(); //PAY ATTENTION HERE! } Java allow me to compile this, and i IMAGINE that the field child in

Was thinking it should be pretty easy to create a ProgressBar that drew some text upon itself. However, I am not quite sure what is happening here... I added the following two overrides: protected override void OnPaintBackground(PaintEventArgs pevent) { base.OnPaintBackground(pevent); var flags = TextFormatFlags.VerticalCenter | TextFormatFlags.HorizontalCenter | TextFormatFlags.SingleLine | TextFormatFlags.WordEllipsis; TextRenderer.DrawText(pevent.Graphics, "Hello", Font, Bounds, Color.Black, flags); } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); var flags =

What is the difference between override and overload? Jon Skeet Overloading: picking a method signature at compile time based on the number and type of the arguments specified Overriding: picking a method implementation at execution time based on the actual type of the target object (as opposed to the compile-time type of the expression) For example: class Base { void foo(int x) { System.out.println("Base.foo(int)"); } void foo(double d) { System.out.println("Base.foo(double)"); } } class Child extends Base { @Override void foo (int x) { System.out.println("Child.foo(int)"); } } ... Base b =