typeof for Rust

1
2
3

#define SWAP(a, b) do { \
typeof(a) tmp = a; b = a; a = tmp; \
} while(0)

1
2
3
4
5

#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

#define container_of(ptr, type, member) ({                      \
        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
        (type *)( (char *)__mptr - offsetof(type,member) );})

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17

use std::any::type_name;

fn type_of<T>(_: T) -> &'static str {
    type_name::<T>()
}

fn main() {
    let x = 21;
    let y = 2.5;
    println!("{}", type_of(&y));
    println!("{}", type_of(x));
    println!("{}", type_of("abc"));
    println!("{}", type_of(String::from("abc")));
    println!("{}", type_of(vec![1, 2, 3]));
    println!("{}", type_of(main));
    println!("{}", type_of(&type_of::<i32>));
}