composing

函数组合工具

此库导出两个宏，compose_expr 和 compose_fn，允许轻松组合表达式和函数。

它们都支持从右到左和从左到右的组合。

示例

use composing::*;

fn plus_one(x: i32) -> i32 { x + 1 }
fn times_two(x: i32) -> i32 { x * 2 }
fn to_string(x: i32) -> String { x.to_string() }

let composition = compose_fn!(to_string, plus_one, times_two);
assert_eq!(composition(17), "35");

let composition = compose_fn!(times_two => plus_one => to_string);
assert_eq!(composition(17), "35");