37: Add Inv and Pow traits. r=cuviper a=clarcharr
This is not a breaking change, and closes#34 and #38.
This doesn't add any impls for the other `num` crates, just floats with `std` enabled. The trait has to be added before those other crates can be updated.
32: Implement CoreFloat trait r=cuviper a=vks
This is a subset of the `Float` trait, but works with `no_std`.
Some code was simplified by using `CoreFloat`.
30: Re-introduce the std feature r=vks a=cuviper
This is a port of @vks's rust-num/num#296, but without the feature-toggled changes to `Float`. Now `Float` and the newer `Real` are completely dependent on having `std` enabled. In the future we can consider adding separate more-limited float/real traits that can work without `std`, like the `BaseFloat` that was originally proposed in the former PR.
This is a breaking change with a bump to 0.2, since anyone currently using `default-features = false` will lose functionality. The actual API is otherwise unchanged, so my plan is to employ the "semver trick" -- publishing a new num-traits-0.1 that re-exports everything from 0.2 (with `std`). Thus all `num-traits` users should remain compatible even if they mix 0.1 and 0.2.
Closes#16.
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. :)
Josh Stone
bors[bot]
Clar Charr
Vinzent Steinberg
Toshiki Teramura
Yoan Lecoq