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Auto merge of #28892 - cristicbz:default-wrapping, r=alexcrichton

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It's not very common to store `Wrapping` values, but I kept wrapping and unwrapping a hash value when I taking it out of a struct to do operations on it. I couldn't store the hash as `Wrapping<u64>` because I wanted to be able to `#[derive(Default)]` for the struct.

At any rate, it feels to me that `Wrapping<T>` should implement pretty much everything `T` does. I left out `#[derive(Hash)]` since I'd be hard pressed to find a use case and wanted to avoid the extra generated code, but maybe I should add that too?
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bors 2015-10-08 07:39:06 +00:00
commit 88898e6ca7
1 changed files with 1 additions and 1 deletions
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src/libcore/num/mod.rs
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@ -39,7 +39,7 @@ use slice::SliceExt;
/// all standard arithmetic operations on the underlying value are
/// intended to have wrapping semantics.
#[stable(feature = "rust1", since = "1.0.0")]
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Debug)]
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Debug, Default)]
pub struct Wrapping<T>(#[stable(feature = "rust1", since = "1.0.0")] pub T);
pub mod wrapping;