We don't have implementations for many of the methods in `no_std`. It's
hostile to external implementors if some trait methods are conditional
on a feature, as that feature could be added by anyone in a dependency
tree. Instead, let's just live without these traits for now.
23: Add RealNum trait for real data types (Float, but without floating-point specific features) r=cuviper a=yoanlcq
This is supposed to fix [#19](https://github.com/rust-num/num-traits/issues/19); I assumed going ahead would be better than bumping the thread.
In any case, I understand that it is a quite significant addition and won't mind too much if it doesn't make it.
This adds a new `RealNum` trait, along with a universal impl `impl<T: Float> RealNum for T { ... }`.
Therefore, this shouldn't be a breaking change, except in places where both traits are imported (which obviously only happened in a few places in this crate).
The intent is that generic code may prefer to use `RealNum` instead of `Float` when floating-point isn't a requirement. In the future (next major version ?), I guess `Float` could be made to only provide floating-point-specific features on top of `RealNum`.
Most of the code+doc was copy-pasted from `Float`, but the doc comments should be up-to-date with the situation; `Float` only makes an appearance when talking about NaN and infinity.
Issues I've seen :
- `RealNum` might not be the name we want;
- I've mentioned that `sqrt()` is allowed to panic if the input is negative and has no meaningful NaN representation;
- Should we do that too for e.g `log()` ? Like `sqrt()`, it's supposed to return Nan when `x < 0`.
Thanks for your time. :)
17: Add AsPrimitive trait for generic casting with `as` r=cuviper a=Enet4
This is my personal attempt at #7. It is fairly similar to what can be found in `asprim`, although implemented from scratch. Please let me know of what you think. Could it use more tests? Should I also leave a safety notice that some conversions with `as` are currently UB (rust-lang/rust#10184)?
21: Add checked shifts r=cuviper a=fabianschuiki
Add traits `CheckedShl` and `CheckedShr` that correspond to the standard
library's `checked_shl` and `checked_shr` functions. Implement the trait
on all primitive integer types by default, akin to what the standard
library does.
The stdlib is somewhat inconsistent when it comes to the type of the
shift amount. The `checked_*` functions have a `u32` shift amount, but
the `std::ops::{Shl,Shr}` traits are generic over the shift amount. Also
the stdlib implements these traits for all primitive integer types as
right-hand sides. Our implementation mimics this behaviour.
Make the checked left and right shifts take a `u32` as right-hand side,
which is more consistent with the other checked operations. Also drop
`CheckedShl` and `CheckedShr` from the `PrimInt` trait, to not break
existing code. Add doctests for the two traits.
Add traits `CheckedShl` and `CheckedShr` that correspond to the standard
library's `checked_shl` and `checked_shr` functions. Implement the trait
on all primitive integer types by default, akin to what the standard
library does.
The stdlib is somewhat inconsistent when it comes to the type of the
shift amount. The `checked_*` functions have a `u32` shift amount, but
the `std::ops::{Shl,Shr}` traits are generic over the shift amount. Also
the stdlib implements these traits for all primitive integer types as
right-hand sides. Our implementation mimics this behaviour.
Also update to use https instead of http. This avois mixed content
degradation on docs.rs.
The doc root URLs are correct as they are, the URL does not include the
crate name itself.
Rust 1.4 through 1.7 will issue warnings that `pub extern crate` does
not work as expected, although it appears to be fine. But Rust 1.8 and
later issue `#[warn(private_in_public)]` for `pub use num_foo as foo` if
that crate isn't public, and that's headed toward a hard error.
@bluss suggested instead `pub mod foo { pub use num_foo::*; }`, which
I thought I had tried before, but it appears to work fine on all
versions of Rust. Let's do it!
A small downside is that docs for `num::foo` now just show the wildcard
reexport, instead of direct documentation, but at least there's a link
to follow to the sub-crate.
It's a breaking change that `num::num_foo` paths are no longer public,
but we didn't really want those exposed in the first place. I consider
this minor -- people should either use the `num::foo` module as before
the split-up, or use the `num_foo` crate directly.
Fixes#189.
Serde 0.7 dropped it's dependency on num, so this patch moves
the implementations here. For the sake of a better implementation,
this just serializes BigUint as a `Vec<u32>`, `BigInt` as a
`(u8, Vec<u32>)`, `Complex<T>` as a `(T, T)`, and `Ratio<T>`
as a `(T, T)`.
- Integer only needs to require Ord explicitly, and then PartialOrd, Eq,
and PartialEq come transitively.
- Generics on Integer can implicitly use all of those comparison traits.
This should not be a breaking change, as it doesn't actually change any
effective trait requirements -- only what's explicit for simplicity.
Josh Stone
Vinzent Steinberg
bors[bot]
Yoan Lecoq
Eduardo Pinho
Fabian Schuiki
svartalf
Jacob Kiesel
bluss
Łukasz Jan Niemier
Murarth
Erick Tryzelaar
Mike MacDonald (crazymykl)
Felix S. Klock II