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There are two new "utility" traits covering the basic operators: `Add`, `Sub`, `Mul`, `Div`, and `Rem`. - `NumOps<Rhs, Output>`: operators with an arbitrary operand and output. - `NumAssignOps<Rhs>`: assignment operators with an arbitrary operand. Then the new collection of numeric traits are: - `Num`: effectively unchanged, just taking operands by value. - `NumRef`: `Num` adding reference operands on the right side. - `RefNum`: `&T` operators, with either `T` or `&T` on the right side. - This does not specify `T: Num`, as rust-lang/rust#20671 means that could only add a constraint, without implying its presence for use. - `NumAssign`: `Num` adding assignment operators by value. - `NumAssignRef`: `NumAssign` adding reference assignment operators. - Nothing actually implements this yet! Acknowledgement: this is roughly based on [@andersk's suggestion][1]. [1] https://github.com/rust-num/num/issues/94#issuecomment-269073071 |
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