What do I need to put into the where clause for the generic NumT so that I can subtract references to NumT?
I'm currently getting the following error:
cannot subtract `&NumT` from `&NumT`
note that both are immutable references.
NumT: SubAssign<&NumT> should work, if you have a &mut NumT
No, these are both immutable references. I don't want to trash any of their values, instead I just want to create a new value.
yep. Rust Playground
Got there in the end:
&'t NumT: Sub<Output = NumT>
does the trick
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