num-traits/RELEASES.md

Release 0.2.4

• Support for 128-bit integers is now automatically detected and enabled. Setting the i128 crate feature now causes the build script to panic if such support is not detected.

Contributors: @cuviper

Release 0.2.3

• The new CheckedNeg and CheckedRem traits perform checked Neg and Rem, returning Some(output) or None on overflow.
• The no_std implementation of FloatCore::to_degrees for f32 now uses a constant for greater accuracy, mirroring rust#47919. (With std it just calls the inherent f32::to_degrees in the standard library.)
• The new MulAdd and MulAddAssign traits perform a fused multiply- add. For integer types this is just a convenience, but for floating point types this produces a more accurate result than the separate operations.
• All applicable traits are now implemented for 128-bit integers starting with Rust 1.26, enabled by the new i128 crate feature. The FromPrimitive and ToPrimitive traits now also have corresponding 128-bit methods, which default to converting via 64-bit integers for compatibility.

Contributors: @cuviper, @LEXUGE, @regexident, @vks

Release 0.2.2

• Casting from floating point to integers now returns None on overflow, avoiding rustc's undefined behavior. This applies to the cast function and the traits NumCast, FromPrimitive, and ToPrimitive.

Contributors: @apopiak, @cuviper, @dbarella

Release 0.2.1

• The new FloatCore trait offers a subset of Float for #![no_std] use. This includes everything except the transcendental functions and FMA.
• The new Inv trait returns the multiplicative inverse, or reciprocal.
• The new Pow trait performs exponentiation, much like the existing pow function, but with generic exponent types.
• The new One::is_one method tests if a value equals 1. Implementers should override this method if there's a more efficient way to check for 1, rather than comparing with a temporary one().

Contributors: @clarcharr, @cuviper, @vks

Release 0.2.0

• breaking change: There is now a std feature, enabled by default, along with the implication that building without this feature makes this a #![no_std] crate.
  • The Float and Real traits are only available when std is enabled.
  • Otherwise, the API is unchanged, and num-traits 0.1.43 now re-exports its items from num-traits 0.2 for compatibility (the semver-trick).

Contributors: @cuviper, @termoshtt, @vks

Release 0.1.43

• All items are now re-exported from num-traits 0.2 for compatibility.

Release 0.1.42

• num-traits now has its own source repository at rust-num/num-traits.
• ParseFloatError now implements Display.
• The new AsPrimitive trait implements generic casting with the as operator.
• The new CheckedShl and CheckedShr traits implement generic support for the checked_shl and checked_shr methods on primitive integers.
• The new Real trait offers a subset of Float functionality that may be applicable to more types, with a blanket implementation for all existing T: Float types.

Thanks to @cuviper, @Enet4, @fabianschuiki, @svartalf, and @yoanlcq for their contributions!

Prior releases

No prior release notes were kept. Thanks all the same to the many contributors that have made this crate what it is!