Is is possible for rust to have shallow copies, because it would appear that a move replaces a shallow copy?
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You have to differentiate based on the underlying type.
You can't do a shallow copy of
struct Foo(String);
because two instances ofFoo
would point at the very sameString
, which would violate the strict aliasing rule .However, if you are having a reference counter, e.g.
struct Foo(Rc<String>);
it is possible, becauseRc
will prevent you from doing unsafe things, e.g. having a mutable reference, when there are others references on theString
.It is also possible for types that implement [
Clone
] to make a "shallow" copy, becauseCopy
implies, that the type can be copied by usingmemcpy
(e.g. au32
or a&T
).What is the difference between Copy and Clone? is also very worth reading.
So, in general no: Exceptions are reference counted structs (
Rc
orArc
) ,Cloneables
, or references (&T
), because they don't violate the strict aliasing rule.