# num-traits

[![crate](https://img.shields.io/crates/v/num-traits.svg)](https://crates.io/crates/num-traits)
[![documentation](https://docs.rs/num-traits/badge.svg)](https://docs.rs/num-traits)
[![minimum rustc 1.8](https://img.shields.io/badge/rustc-1.8+-red.svg)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
[![build status](https://github.com/rust-num/num-traits/workflows/master/badge.svg)](https://github.com/rust-num/num-traits/actions)

## 引入背景
Num-traits在rust中提供了数字计算等数学方法的三方库，包括Rust中通用数学的数字特性。

## 使用指导
### 使用Openharmony编译框架
在你的"BUILD.gn"中使用deps字段添加对num-traits crate的依赖，例如：

```BUILD.gn
ohos_rust_shared_library("foo") {
  source = [ "src/lib.rs" ]
  deps = [ "//third_party/rust/crates/num-traits:lib" ]
}
```

### 使用Cargo
在你的 "Cargo.toml "中添加：

``toml
[dependencies]
num-traits = "0.2"
```

## 特性

这个板块可以在没有标准库的情况下使用(`#![no_std]`)，通过禁用
默认的 "std "功能。在`Cargo.toml'中使用这个功能：

```toml
[dependencies.num-traits]
version = "0.2"
default-features = false
# features = ["libm"]    # <--- Uncomment if you wish to use `Float` and `Real` without `std`
```

`Float`和`Real`特性只有在启用`std`或`libm`时才可用。
`libm`特性仅在Rust 1.31及以后版本中可用（[见PR #99](https://github.com/rust-num/num-traits/pull/99)）。

`FloatCore`特性始终可用。 用于`f32`的`MulAdd`和`MulAddAssign`也需要`f64`的`MulAddAssign`。
和`f64`也需要`std`或`libm`，就像`Pow`中的有符号和浮点指数的实现。
指数的实现也需要`pow'。

`i128`和`u128`的实现只在Rust 1.26及以后的版本中可用。
以后的版本。 构建脚本会自动检测到这一点，但你可以通过启用 "i128 "和 "u128 "来使它成为
但你可以通过启用`i128'板块功能使其成为强制性的。

## 发布

发行说明可在[RELEASES.md](RELEASES.md)中找到。

## 兼容性

`num-traits`板块已在rustc 1.8及以上版本中测试。

## 许可证

使用以下任何一种许可证

 * [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
 * [MIT许可证](http://opensource.org/licenses/MIT)

## 开发者贡献

在使用该工具的过程中有任何问题欢迎开发者在社区issue中反馈。

<br>

[
  {
    "Name": "num-traits",
    "License": "Apache License V2.0, MIT",
    "License File": "LICENSE-APACHE, LICENSE-MIT",
    "Version Number": "num-traits-0.2.15",
    "Owner": "fangting12@huawei.com",
    "Upstream URL": "https://github.com/rust-num/num-traits",
    "Description": "A Rust library that provides support for numeric traits like zero, one, and ordering."
  }
]

# num-traits

[![crate](https://img.shields.io/crates/v/num-traits.svg)](https://crates.io/crates/num-traits)
[![documentation](https://docs.rs/num-traits/badge.svg)](https://docs.rs/num-traits)
[![minimum rustc 1.8](https://img.shields.io/badge/rustc-1.8+-red.svg)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
[![build status](https://github.com/rust-num/num-traits/workflows/master/badge.svg)](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"
```

## 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.

## License

Licensed under either of

 * [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
 * [MIT license](http://opensource.org/licenses/MIT)

at your option.

### Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.