Rust From


Rust's From trait is a general-purpose trait for converting between types. For any two types TypeA and TypeB,

impl From<TypeA> for TypeB

indicates that an instance of TypeB is guaranteed to be constructible from an instance of TypeA. An implementation of From looks like this:

struct TypeA {
    a: u32,

struct TypeB {
    b: u32,

impl From<TypeA> for TypeB {
    fn from(src: TypeA) -> Self {
        TypeB {
            b: src.a,