rust实现打印变量的类型

Rust实现打印变量的的类型名

use std::fmt::{Debug};

#[derive(Debug)]
enum Unit{
    P1,P2
}

//实行trait bound
fn type_v<T>(t:T) where T:Debug {
    println!("{:?},{}",t,core::any::type_name::<T>());
 }

fn main() {

    let ref r1 = 3;
    let r2 = &3;
    let r3 = Unit::P1;
    type_v(&mut (1.0 as f64));
    type_v(r1);
    type_v(r2);
    type_v(r3);
}

输出

1.0,&mut f64
3,&i32
3,&i32
P1,fib::Unit