没网站做cpa关键词的选取原则

PhysUnits · 物理单位库

Type-safe physical quantities with dimensional analysis
带量纲分析的类型安全物理量库

A Rust library for safe unit operations /
Rust实现的类型安全单位计算库

Core Design / 核心设计

1. Dimension / 量纲

/// Base SI dimensions / 国际单位制基本量纲
pub struct Dimension<L: Integer,  // Length (m) / 长度(米)M: Integer,  // Mass (kg) / 质量(千克)T: Integer,  // Time (s) / 时间(秒)I: Integer,  // Current (A) / 电流(安培)Th: Integer, // Temperature (K) / 温度(开尔文) N: Integer,  // Amount (mol) / 物质的量(摩尔)J: Integer   // Luminosity (cd) / 发光强度(坎德拉)
>(PhantomData<(L, M, T, I, Th, N, J)>);

2. Unit / 单位

/// Unit conversion rules / 单位转换规则
pub trait Unit {type Dimension;/// Convert to base unit / 转换到基准单位fn to_base(value: f64) -> f64;/// Unit symbol / 单位符号const SYMBOL: &'static str;
}

3. Quantity / 物理量

/// Physical quantity with value and unit / 带单位和值的物理量
pub struct Quantity<V, U: Unit> {/// Scalar value / 标量值pub value: V,_unit: PhantomData<U>
}impl<V, U: Unit> Quantity<V, U> {/// Create new quantity / 创建新物理量pub fn new(value: V) -> Self {Self { value, _unit: PhantomData }}
}

Usage / 使用示例

Basic Conversion / 基础转换

use physunits::{Meter, Inch, Quantity};// Create length / 创建长度
let length = Quantity::<f64, Meter>::new(2.0);// Convert units / 单位转换
let inches = length.convert::<Inch>();
println!("{} m = {} in", length.value, inches.value);

Temperature / 温度转换

use physunits::{Celsius, Fahrenheit};let boiling = Quantity::<f64, Celsius>::new(100.0);
let fahr = boiling.convert::<Fahrenheit>();
println!("Water boils at {} °F", fahr.value); 

Force Calculation / 力的计算

use physunits::{kg, m, s, N};let mass = 5.0 * kg;
let acceleration = 9.8 * m / (s * s);
let force: Quantity<f64, N> = mass * acceleration;
println!("Force: {} N", force.value);

Features / 特性

Feature	功能描述
📏 Compile-time dimensional safety	编译期量纲安全
⚡ Zero runtime overhead	零运行时开销
🔢 Integer & float support	支持整数和浮点数
🔄 Automatic unit conversion	自动单位转换

Installation / 安装

[dependencies]
physunits = "0.0.1"