Support for singletons

[kazuho]

ngCore has a special kind of type called "singleton" which looks like a class, but which is actually an singleton object - so that the callers can call the functions as if they were defined as static functions / the type can be defined just by overriding the necessary functions.

The question is what is the best method within JSX to define such kind of data structure.

[kazuho]

IMO, below is the answer. IMO it should work since the initializers of static properties are called lazily.

// the definition
class SingletonFoo extends Foo {
    static var _ = new SingletonFoo();
    override function meth() : void {
        ...
    }
}

// caller
SingletonFoo._.meth();