• anton@lemmy.blahaj.zone
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    9 months ago

    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_once but not into because of the implicit contract of these traits.

    * = I’m counting expensive computation, but not allocation and memcopy as a side effect in this comment.