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Remove uses of unsafe. #142

Merged
merged 4 commits into from
Apr 4, 2020
Merged

Remove uses of unsafe. #142

merged 4 commits into from
Apr 4, 2020

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jswrenn
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@jswrenn jswrenn commented Mar 22, 2020

Fixes #126 by completely removing all instances of unsafe. Instead, Unsigned values are flowed through the methods core::ops and type_operator traits. The appropriate methods have been added to the Private* traits, as needed.

This pull request takes an aggressive approach, but it may not be desirable to remove all instances of unsafe. This pull request:

  • makes a breaking? change to TArr
  • introduces a small number of internal type bounds, which could impact performance.

I'll spotlight where these changes occur with pull-request comments.

@jswrenn jswrenn force-pushed the look-ma-no-unsafe branch 2 times, most recently from b83370b to a2c1ea1 Compare March 22, 2020 22:40
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I've highlighted important changes with individual comments. These include:

  • design decisions
  • possible performance footguns
  • changes potentially affecting stability

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Comment on lines 1225 to 1226
where
Bn: Copy
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The Bn: Copy bound is needed so we can produce an instance of the least significant bit from a reference to a UInt.

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I have no objection to this, but couldn't we alternatively make get_bit take things by value?

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We could! We'd just need to add an extra Copy bound to the PartialDiv* implementations.

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jswrenn commented Mar 27, 2020

  • introduces a small number of internal type bounds, which could impact performance.

Per #63 (comment), this may not actually pose any performance issue.

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This is great, thank you for doing this!

Would you mind just running cargo fmt? That should be enough to get the build passing.

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Bn: Copy
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I have no objection to this, but couldn't we alternatively make get_bit take things by value?

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paholg commented Apr 4, 2020

Thanks again for doing this, I am very excited to get it merged. :)

@paholg paholg merged commit 8b49f74 into paholg:master Apr 4, 2020
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Warnings on nightly about mem::uninitialized.
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