Abstract class with haXe

There is no abstract class in haXe. An abstract method is a method that is declared without an implementation. We can define a private constructor. This way, such a class can't be constructed. Only subclasses might define a public constructor.

We cannot define any abstract method in haXe either. But there is a way to gain the power of abstract feature in haXe. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class. So, we need to define an empty body (or maybe throw an exception) in the main class. Then these functions will be overridden in subclasses.
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