Reference Counting with Linear Types

[atravers]

But if the use of Counter could be considered “pure from the outside” then IO a isn’t needed - ST s a and runST would be enough. Also see:

Using unsafePerformIO safely?

A colleague of mine Victor Miraldo asked me today whether I know how to use unsafePerformIO safely. And I realized I have no idea. Do you? Or do you know of an existing blog post / other resource that addresses this? Context: Victor is writing a program that needs to call out to an SMT solver. An SMT solver acts like a pure function: it gets information in and then deterministically produces a result based (only) on its input. But because the SMT solver is invoked via a separate process, the in…