Add make_immutability decorator

tidylab / decorators

Extend the behaviour of a function without explicitly modifying it

https://tidylab.github.io/decorators/

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Add make_immutability decorator #2

Open harell opened 3 years ago

harell commented 3 years ago

[Frozen instances in Python dataclasses module ] (https://docs.python.org/3/library/dataclasses.html#frozen-instances)
makeActiveBinding
@property built-in decorator

Car <- function(model = NA_character_, hp = NA_real_) return(
   data.frame(modek = model, hp = hp)
)

Car <- make_immutability(Car, freez = True)
car <- Car(model = "Mercedes-Benz S-Class", hp = 180)
car$hp <- 200 # fails because object is immutable

harell commented 3 years ago

Why use make_immutability()?

User-facing: behaves like data structures
Developer-facing: give control of access

Use cases:

ValueObject