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Detail on Clone using Copy

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Carol (Nichols || Goulding)
2017-12-04 12:06:27 -05:00
parent f1f1442aba
commit 3769a964e8
1 changed files with 2 additions and 1 deletions
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second-edition/src/appendix-03-derivable-traits.md
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@@ -152,7 +152,8 @@ no other code is necessary. The `Copy` trait does not define any methods to
prevent programmers from overloading those methods violating the assumption
that no arbitrary code is being run. You can derive `Copy` on any type whose
parts all implement `Copy`. The `Copy` trait can only be applied to types that
also implement `Clone`.
also implement `Clone`, as a type that implements `Copy` has a trivial
implementation of `Clone`, doing the same thing as `Copy`.
An example of when `Copy` is required is when storing values of that type in a
`Cell<T>`, a data structure that provides interior mutability by moving values