Function tao_of_rust::ch06::functions::generic_function

pub fn generic_function()

函数：泛型函数

Base usage: 泛型函数可推断类型

use std::ops::Mul;
fn square<T: Mul<T, Output=T>>(x: T, y: T) -> T {
    x * y
}
fn main() {
    let a: i32 = square(37, 41);
    let b: f64 = square(37.2, 41.1);
    assert_eq!(a, 1517);
    assert_eq!(b, 1528.92); // 浮点数可能执行结果有所差别
}

Base usage: 使用turbofish操作符

use std::ops::Mul;
fn square<T: Mul<T, Output = T>>(x: T, y: T) -> T {
    x * y
}
fn main() {
    let a = square::<u32>(37, 41);
    let b = square::<f32>(37.2, 41.1);
    assert_eq!(a, 1517);
    assert_eq!(b, 1528.9199);
}