Rename Div operator trait to Quot and Modulo operator trait to Rem #5990
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This renaming, proposed in the [Numeric Bikeshed](https://github.com/mozilla/rust/wiki/Bikeshed-Numeric-Traits#rename-modulo-into-rem-or-remainder-in-traits-and-docs), will allow us to implement div and and modulo methods that follow the conventional mathematical definitions for negative numbers without altering the definitions of the operators (and confusing systems programmers). Here is a useful answer on StackOverflow that explains the difference between `div`/`mod` and `quot`/`rem` in Haskell: (When is the difference between quotRem and divMod useful?)[http://stackoverflow.com/a/339823/679485]. This is part of the numeric trait reforms tracked in issue #4819.
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Does % still do the thing that is one machine instruction? |
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@graydon Yes of course. / and % behave exactly like C – for compatibility and performance reasons. The only change is the name. |
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Cool, thanks! |
This was referenced Apr 22, 2013
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BigInt had been supported quot/rem and div/mod correctly, but after merging #5990 they have been broken. This commit fixes it.
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Sep 10, 2020
default_trait_access: Fix wrong suggestion rust-lang/rust-clippy#5975 (comment) > I think the underlying problem is clippy suggests code with complete parameters, not clippy triggers this lint even for complex types. AFAIK, If code compiles with `Default::default`, it doesn't need to specify any parameters, as type inference is working. (So, in this case, `default_trait_access` should suggest `RefCell::default`.) Fixes rust-lang#5975 Fixes rust-lang#5990 changelog: `default_trait_access`: fixed wrong suggestion
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This renaming, proposed in the Numeric Bikeshed, will allow us to implement div and and modulo methods that follow the conventional mathematical definitions for negative numbers without altering the definitions of the operators (and confusing systems programmers). Here is a useful answer on StackOverflow that explains the difference between
div/modandquot/remin Haskell: (When is the difference between quotRem and divMod useful?)[http://stackoverflow.com/a/339823/679485].This is part of the numeric trait reforms tracked in issue #4819.