Any Functions

Type introspection functions

TypeId and type_name

use std::any::{TypeId, type_name};

fn main() {
    // TypeId - unique identifier for types
    println!("=== TypeId ===");
    println!("TypeId of i32: {:?}", TypeId::of::<i32>());
    println!("TypeId of String: {:?}", TypeId::of::<String>());
    println!("TypeId of &str: {:?}", TypeId::of::<&str>());

    // Compare types
    println!("\n=== Type Comparison ===");
    println!("i32 == i32: {}", TypeId::of::<i32>() == TypeId::of::<i32>());
    println!("i32 == i64: {}", TypeId::of::<i32>() == TypeId::of::<i64>());

    // type_name - human readable name
    println!("\n=== type_name ===");
    println!("i32: {}", type_name::<i32>());
    println!("String: {}", type_name::<String>());
    println!("Vec<i32>: {}", type_name::<Vec<i32>>());
    println!("HashMap: {}", type_name::<std::collections::HashMap<String, i32>>());
    println!("fn: {}", type_name::<fn(i32) -> bool>());

    // type_name_of_val
    let x = 42;
    let s = String::from("hello");
    let v = vec![1, 2, 3];

    println!("\n=== type_name_of_val ===");
    println!("x: {}", std::any::type_name_of_val(&x));
    println!("s: {}", std::any::type_name_of_val(&s));
    println!("v: {}", std::any::type_name_of_val(&v));
}