Use references for scalar operands

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Issue 类型
功能
描述清晰度
基本清楚
活跃度
停滞
技术栈
rust
领域
data

调研方向

Start by tracing the ops macros and the ScalarOperand and StaticOperand implementations mentioned in the issue, then reproduce the array-plus-referenced-scalar example. Investigate the conflicting implementation error and existing operand combinations. Done means the example compiles while existing array operation behavior remains supported.

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描述

It would be useful for me to be able to use references to scalars instead of owned instances when performing operations on arrays.

e.g., this fails:

let arr1 = array!([1, 2, 3]);
let four: i32 = 4;
let arr2 = arr1 + &four; //error

I naively tried modifying the ops macros to accept references but kept getting a conflicting implementation error. It seems that the compiler is worried that someone will come along an add an implementation to StaticOperand for reference types:

    = note: downstream crates may implement trait `impl_ops::ScalarOperand` for type `&_`

...which is strange because there's a 'static type bound on ScalarOperand?

In any case, if anyone has any guidance on how to proceed, I'd greatly appreciate it! I'm happy to open a PR with a nudge in the right direction.

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Rust
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30 天内没有已合并 PR

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