rustHow do I get the size of a variable in Rust?

The size of a variable in Rust can be determined using the std::mem::size_of function. This function takes a reference to a type as an argument and returns the size of the type in bytes.

fn main() {
    let x = 5;
    println!("Size of x is {} bytes", std::mem::size_of::<i32>(&x));
}

Output example

Size of x is 4 bytes

Code explanation

• std::mem::size_of: function to determine the size of a variable in Rust
• &x: reference to the variable x
• <i32>: type of the variable x

Helpful links

• std::mem::size_of

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