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Rust program to demonstrate the 'into' trait

Rust Example: Write a program to demonstrate the "into" trait.
Last Updated : November 27, 2021

Problem Statement

In this program, we will demonstrate the "into" trait, and, convert the variable of i32 type into a complex type structure.

Program/Source Code

The source code to demonstrate the "into" trait is given below. The given program is compiled and executed successfully.

// Rust program to demonstrate the "into" trait

fn TypeOf<T>(_: &T) {
    println!("{}", std::any::type_name::<T>())
}

#[derive(Debug)]
struct NumStruct {
    num: i32,
}

impl From<i32> for NumStruct {
    fn from(item: i32) -> Self {
        NumStruct { num: item }
    }
}

fn main() 
{
    let intVar = 5;
    let num: NumStruct = intVar.into();
    
    print!("intVar {:?}, Type: ", intVar);
    TypeOf(&intVar); 
    
    print!("num {:?}, Type: ", num);
    TypeOf(&num); 
}

Output

intVar 5, Type: i32
num NumStruct { num: 5 }, Type: main::NumStruct

Explanation

Here, we created  a variable intVar  of i32 type. Then we created another variable num using "into" trait using existing variable intVar. After that, we printed the value of variables and their data type.

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