std::interfaces

std::interfaces defines shared std protocol interfaces such as Drop, Len, and Iterator(T).

Full reference: interfaces.

Example: Iterator(T) and next() -> T?#

import std::interfaces;

struct CounterIter {
  cur: int,
  end: int,
}

impl CounterIter {
  public fn init (end: int) -> CounterIter {
    return { cur: 0, end: end };
  }
}

impl CounterIter as std::interfaces::Iterator(int) {
  public fn next (mut self: &CounterIter) -> int? {
    if self.cur >= self.end {
      return None;
    }
    let v: int = self.cur;
    self.cur = self.cur + 1;
    return Some(v);
  }
}

See also#

• Full reference: interfaces
• for iterator iteration: flow for