Hi, lloda schreef op do 25-11-2021 om 20:08 [+0100]: I think literal arrays are always immutable, and one could base the test on that. > Is such a function useful in some other context? If one has an array which is already immutable, it can be referenced freely and copying it seems unnecessary. If one has a mutable array, is there any reason why one would want to make an immutable copy?
To avoid accidental mutation (though at the cost of making a copy). Also, literals aren't necessarily immutable if 'eval' is used: (let ((literal (make-array 0 1 1))) (eval `(array-set! ',literal #xff 0 0) (current-module)) literal) ;; output: #2((255)) As-is, this is a somewhat contrived example. But 'eval' is useful REPL-like things, and if someone implements a REPL-like thing, they might want to ‘immutabilise’ all input first such that array-set! on literals will actually produce an exception as one would expect. An alternative method would be to compile the code before running (which is what the standard REPL does IIUC), but _requiring_ this extra step seems suboptimal to me. Greetings, Maxime. p.s. Somehow, your e-mail ended up in spam, for no apparent reason.
