Length

trait Length<T>

A size query: x.len().

Arrays, Vec, strings (UTF-8 bytes), tuples and records (fields) have a structural length and need no instance; fixed sizes fold at compile time. They meet a T: Length bound too, len reading that same length. Implement Length to give your own type a length.

Required methods#

Examples#

use tests::assert;
class Team {
    pub names: Vec<string>,
}

impl Length for Team {
    pub fn len(Team t) -> int {
        return t.names.len();
    }
}

fn main() {
    let t = new Team(Vec::from(["ana", "bo"]));
    assert!(t.len() == 2);
}

See also#

• Vec
• Length::len
• Add: The addition operator +.
• Sub: The subtraction operator -.
• Mul: The multiplication operator *.
• Div: The division operator /.
• Neg: The unary negation operator -x.
• Rem: The remainder operator %.