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Nathaniel McCallum 955c45b933 Add safe cast operation traits
This commit adds safe cast operation traits which each have only one of
the properties from a naked cast. This allows the clear definition of
specific properties in a generic context.

All methods defined in this commit are zero-cost abstractions.
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README.md

num-traits

crate documentation minimum rustc 1.8 Travis status

Numeric traits for generic mathematics in Rust.

Usage

Add this to your Cargo.toml:

[dependencies]
num-traits = "0.2"

and this to your crate root:

extern crate num_traits;

Features

This crate can be used without the standard library (#![no_std]) by disabling the default std feature. Use this in Cargo.toml:

[dependencies.num-traits]
version = "0.2"
default-features = false

The Float and Real traits are only available when std is enabled. The FloatCore trait is always available. MulAdd and MulAddAssign for f32 and f64 also require std, as do implementations of signed and floating- point exponents in Pow.

Implementations for i128 and u128 are only available with Rust 1.26 and later. The build script automatically detects this, but you can make it mandatory by enabling the i128 crate feature.

Releases

Release notes are available in RELEASES.md.

Compatibility

The num-traits crate is tested for rustc 1.8 and greater.