条件工具库

cond_utils 是一个非常简单的库，它提供了两个具有比较工具的特质：Between 和 In。

cond_utils 的目标是简化并使一些常见的任务（如比较一个值是否在两个限制之间，或检查一个值是否在集合中）更加易于阅读。这使得我们可以编写如下代码

use cond_utils::Between;

let number = 6;
if number.between(0, 10) {
    println!("Number is between 0 and 10");
}

而不是

let number = 6;
if number > 0 && number < 10 {
    println!("Number is between 0 and 10");
}

这

use cond_utils::In;

let number = 6;
if number.is_in(&[2, 6, 12]) {
    println!("Number is in set");
}

而不是

let number = 6;
if number == 2 || number == 6 || number == 12 {
    println!("Number is in set");
}

或这

use cond_utils::In;

let number = 6;
if number.in_ranges(&[0..5, 10..100]) {
    println!("Number is between 0 and 5 or between 10 and 100");
}

而不是

let number = 6;
if (number >= 0 && number <= 5) || (number >= 10 && number <= 100) {
    println!("Number is between 0 and 5 or between 10 and 100");
}

它适用于任何实现了 PartialEq + PartialOrd + Sized 特质的类型。