Make Slab::clone_from avoid reallocation #137
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Darksonn
approved these changes
Aug 21, 2023
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#[derive(Clone)]does not automatically implementclone_from, this is a known issue, it seems because of compile times.However,
clone_fromhas a real use when a data structure contains heap-allocated storage, such asBox,Vec, etc: it avoids making a new memory allocation if the "host" struct has enough space already.This PR fixes that, removing the
#deriveand implementing Clone manually, avoiding a new allocation when usingSlab::clone_from.