What Are Tuple Structs in Rust?

Tuple structs are named data structures that contain only fields without named identifiers, defined using parentheses instead of braces. They are useful when you want to give a type a name but don't need to name its individual parts, often used to wrap values or represent simple data like RGB colors.

struct WriteMessage(String);
struct ChangeColorMessage(i32, i32, i32);

fn main() {
    let msg = WriteMessage("Hello".to_string());
    let color = ChangeColorMessage(255, 0, 0);
}

A tuple struct is like a regular struct but without named fields; it's just a list of values wrapped in a custom type name. You use it when the order of data matters more than the names, similar to how a tuple works but with a specific type identity. Think of it as a labeled box where the label is the struct name, but the items inside are just listed in order.