Implement core ops for references + fix core module documentation#21227
Implement core ops for references + fix core module documentation#21227bors merged 4 commits intorust-lang:masterfrom
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* Not all traits are part of the prelude anymore * We switched from pass-by-reference to pass-by-value for most traits * Add some explanations around pass-by-value traits in the context of generic code and additional implementations for reference types.
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r? @huonw (rust_highfive has picked a reviewer for you, use r? to override) |
src/libcore/ops.rs
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I wonder if these three macros could be inlined and just have 3 impl blocks in here.
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@huonw Sure, that's doable. I've never used them anywhere except in the bottom macro. And I think it should save 12 non-empty lines of code. Do you want me to inline them? Personally, I don't have a preference.
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Yeah, I think they should be inlined; thanks!
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@huonw updated macros as suggested |
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I checked libcoretest/ops.rs and didn't see any tests for these kinds of implementations. Otherwise I would have added tests there already, too. But I think it might be a good idea to add tests to make sure that all the operators are doing what they are supposed to and that we don't have a "copy-&-paste" bug that, for example, implements Mul in terms of + or something like that. I'm thinking about adding tests that at least check whether a + b = &a + b = a + &b = &a + &b (repeated with all other binary operators, etc and for all built-in type combinations for which these implementations are provided). |
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Thanks for this PR, and sorry for the slow review (it was a holiday weekend). This looks great. My only request is to annotate with |
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@aturon Done. |
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@sellibitze Somehow I missed the comment about testing before. I'm ok taking this PR as-is, but would also be delighted if you wanted to add some tests like the ones you suggested. Should I wait for those before sending to bors? |
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@aturon I don't yet have such tests implemented because I waited for feedback. So, it would take a while to get this done. I'm ok with adding them to this or a new PR. |
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@sellibitze OK, in that case I think let's move forward with the PR as it stands, and some tests can be brought in as a follow-up PR. (In general we like to land tests together with new code, but in a case like this it's totally fine.) Thanks again for doing this! |
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⌛ Testing commit 970fd74 with merge 8abcbab... |
As discussed with @aturon I added implementations of various op traits for references to built-in types which was already suggested by the ops reform RFC. The 2nd commit updates the module documentation of core::ops to fully reflect the recent change from pass-by-reference to pass-by-value and expands on the implications for generic code.
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As discussed with @aturon I added implementations of various op traits for references to built-in types which was already suggested by the ops reform RFC.
The 2nd commit updates the module documentation of core::ops to fully reflect the recent change from pass-by-reference to pass-by-value and expands on the implications for generic code.