Context managers for Carp. An experiment.
You can include using in your project like this:
(load "git@github.com:carpentry-org/using@0.0.3")using relies on the interface close, which will take in a resource of some
kind, clean it up, and return the result of the expression.
If that function is defined, you can do things like that:
(println*
&(using (Result.unsafe-from-success (File.open "example")) f
&(File.read-all &f)))The file that was opened will be automatically closed once the scope is exited.
So, to reiterate: all you need to work with using is to have a function
close that works on your type! It’s like manual borrow-checking for resource
things! Nifty, eh?
And if you need to support multiple forms, using-do is your friend!
Have fun!