I’m writing a summary of Swift functions in my iTunes U course. I just wanted
to clear a few things as I can find no definitive information online to
formally back up what I say.
In my summary, I say something along these lines:
“A reference to a function can be likened to a reference to a data structure,
and in many ways is similar to an instance of a class. There is immutable
program code, and state, some of which might be mutable. Therefore, in a
multithreaded environment, you need to treat any function that captures and
mutates data in the same way as shared mutable state in order to avoid creating
race conditions”
· Is there a description of how a Swift function type is structured in
memory?
· Is it ‘reasonable’ to liken a function to a class instance in this way?
(given this is only supposed to be an analogy).
· Do I assume correctly about the dangers of capturing data in multithreaded
code?
Cheers
Nick
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