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# num-traits
[](https://crates.io/crates/num-traits)
[](https://docs.rs/num-traits)
[](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
[](https://github.com/rust-num/num-traits/actions)
Numeric traits for generic mathematics in Rust.
## Usage
Add this to your `Cargo.toml`:
```toml
[dependencies]
num-traits = "0.2"
```
and this to your crate root:
```rust
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`:
```toml
[dependencies.num-traits]
version = "0.2"
default-features = false
# features = ["libm"] # <--- Uncomment if you wish to use `Float` and `Real` without `std`
```
The `Float` and `Real` traits are only available when either `std` or `libm` is enabled.
The `libm` feature is only available with Rust 1.31 and later ([see PR #99](https://github.com/rust-num/num-traits/pull/99)).
The `FloatCore` trait is always available. `MulAdd` and `MulAddAssign` for `f32`
and `f64` also require `std` or `libm`, 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](RELEASES.md).
## Compatibility
The `num-traits` crate is tested for rustc 1.8 and greater.
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