A model behaves like a Ref[Ex[A]], that is it can give an expression,
and it can be "set" to an expression, which means its internal state is synchronized to another expression.
For example, a slider widget may contain a Model[Int] where the expression represents the current slider value,
and updating the expression synchronizes the slider to an external expression.
Syntactic alternatives are available through the implicit Ops, so that one can write
model <-- ex instead of model.update(ex) or model <-> attr instead of
model.update(attr); attr.update(model()).
- Companion:
- object