Casting

Casting#

as is the explicit numeric cast.

Truncating integer cast.

let n: i32 = 250;
let b: u8 = n as u8;            // wraps to 250

Float to integer; truncates toward zero.

let f: f64 = 3.7;
let i: i32 = f as i32;          // 3

For semantic conversions, From / Into (see Patterns). For fallible conversions, TryFrom / TryInto.

let s: String = "hi".to_string();         // From<&str>

let n: u32 = u32::from(7u8);              // From<u8>

let big: u8 = u8::try_from(1000)?;        // TryFrom<u32>