this post was submitted on 01 Sep 2023
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Such a case would be the single function having a side effect*. This allows the caller to chose when to execute the side effect or to drop the result without executing it.
In my opinion that is fine with
fn_oncebut notintobecause of the implicit contract of these traits.* = I'm counting expensive computation, but not allocation and memcopy as a side effect in this comment.