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Implement << and <<= for all uints #1723

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merged 6 commits into from
Jun 15, 2023
Merged

Implement << and <<= for all uints #1723

merged 6 commits into from
Jun 15, 2023

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chipshort
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@chipshort chipshort commented Jun 14, 2023

closes #1712

@chipshort chipshort marked this pull request as ready for review June 15, 2023 11:31
impl IntImpl<'_> for Uint64 {}
impl IntImpl<'_> for Uint128 {}
impl IntImpl<'_> for Uint256 {}
impl IntImpl<'_> for Uint512 {}
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Can we remove impl AllImpl<'_> for Uint512 {} and friends now? They should be required implicitly through the supertrait.

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Only if we copy all the bounds from AllImpl to IntImpl. The way it is right now, IntImpl requires that they have AllImpl too.

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I'm referring to line 67-70 in the new code. There we implement

    impl AllImpl<'_> for Uint64 {}
    impl AllImpl<'_> for Uint128 {}
    impl AllImpl<'_> for Uint256 {}
    impl AllImpl<'_> for Uint512 {}

which requires the Uint* types to implement the AllImpl traits. However, line 71-74 should imply that.

E.g. impl IntImpl<'_> for Uint64 {} failes to compile if Uint64 misses Add<&'a Self> since IntImpl requires AllImpl which requires Add<&'a Self>.

Or am I missing something here?

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I know what you mean, but that's not how it works. Let's use Uint64 as an example: Line 71 implies that it implements AllImpl and all the Sh* traits. If we remove line 67, then it does not implement AllImpl anymore and line 71 will fail to compile. AllImpl does not get automatically implemented just because all the bounds are implemented.

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Right you are, amen

packages/std/src/math/uint128.rs Outdated Show resolved Hide resolved
packages/std/src/math/uint128.rs Outdated Show resolved Hide resolved
chipshort and others added 2 commits June 15, 2023 15:37
Co-authored-by: Simon Warta <2603011+webmaster128@users.noreply.github.com>
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Ah, some CHANGELOG entry would be nice

@chipshort chipshort merged commit 3333590 into 1.2 Jun 15, 2023
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@chipshort chipshort deleted the 1712-left-shifts branch June 15, 2023 15:04
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2 participants