Avoid Clone in FenwickTree
#104
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mizar
reviewed
Mar 27, 2023
| @@ -1,35 +1,37 @@ | |||
| use std::iter::repeat_with; | |||
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| use crate::num_traits::Zero; | |||
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- Implement
From<Vec<T>>andFromIteratorforFenwickTree#103 : ImplementFrom<Vec<T>>andFromIteratorforFenwickTree - Avoid
CloneinFenwickTree#104 : AvoidCloneinFenwickTree
These appear to be changes that need not specifically rely on #102. Check out the application examples below.
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I don't think requiring using Default is not always a good idea because the semantics are different. Zero traits is clearly for the "additive identity", while Default trait is for a general "default" instance. The latter is not guaranteed to be an additive identity, and that restriction shall be stated in the doc instead of as a type restriction. I prefer type restrictions to other document constraints, and thus thought introducing Zero trait would be reasonable.
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Current implementation of FenwickTree clones the values to be added, but in principle, these operations can be done by just passing reference. I changed the trait bound so that it now requires reference values can be added, and removed the
Clonebound.This PR depends on #102 (this dependency is not actually necessary, but when it comes to combining these two, it will require a certain amount of rollbacks, so I created a new branch from that branch.)