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Derive `Copy` for some structures. #393

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@frewsxcv @KiChjang @bors-servo @SimonSapin
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frewsxcv commented Sep 28, 2017 •
edited by larsbergstrom

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KiChjang commented Sep 28, 2017

@bors-servo r+
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bors-servo commented Sep 28, 2017

📌 Commit efffb61 has been approved by KiChjang
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bors-servo commented Sep 28, 2017

⌛️ Testing commit efffb61 with merge 54d36fe...

bors-servo added a commit that referenced this pull request Sep 28, 2017

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Auto merge of #393 - frewsxcv:frewsxcv-copy, r=KiChjang 
Derive `Copy` for some structures.

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bors-servo commented Sep 28, 2017

☀️ Test successful - status-travis
Approved by: KiChjang
Pushing 54d36fe to master...

@bors-servo bors-servo merged commit efffb61 into servo:master Sep 28, 2017
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@frewsxcv frewsxcv deleted the frewsxcv:frewsxcv-copy branch Sep 28, 2017

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SimonSapin commented Sep 29, 2017

These types are private, and it looks like nothing uses these new impls. Why this change?
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frewsxcv commented Sep 29, 2017

My understanding was that deriving Copy for types would allow the compiler to better optimize and allow for more inlining. But if that's not the case, let me know and I can revert
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SimonSapin commented Sep 29, 2017

I hadn’t heard of that. Maybe that’s the case, but I’d be surprised. Do you have a reference for that? If the code compiled without Copy, any place it would do an implicit copy it instead did a move. And a move is implemented the same as a copy, only you’re not allowed to use the old location afterwards. But that’s only a compile-time check.
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frewsxcv commented Oct 1, 2017

I haven't found anything concrete about performance, so I think you're right. There is this, but I'm guessing that's more of a suggestion for public types, and I didn't realize these types were not public until you mentioned it a couple comments ago.

In any case: #399
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