• anton@lemmy.blahaj.zone
    7·
    14 hours ago

    With newtypes you can also emulate named args with a single struct. This also allows them to be passed on together.

    struct RectArgs{
    x:i32,
    y:32,
    w:32,
    h:32,
}
impl Default for RectArgs{...}

    Then the call site looks like this:

    rect(RectArgs{
    x:0,
    y:0,
    w:30,
    h:20,
}
// with default arguments
rect(RectArgs{
    w:30,
    h:20,
    .. RectArgs::default ()
}
    • esa@discuss.tchncs.de
      1·
      13 hours ago

      Yeah, though in those cases you might get an extra question about why rect is a function and not a method, e.g.

      Rect {
     w: 30,
     h: 20,
     .. RectArgs::default()
}.do_the_thing()