- From: Tab Atkins Jr. <jackalmage@gmail.com>
- Date: Thu, 3 Oct 2013 13:28:10 -0700
- To: "Mark S. Miller" <erights@google.com>
- Cc: Allen Wirfs-Brock <allen@wirfs-brock.com>, "Robert O'Callahan" <robert@ocallahan.org>, "public-script-coord@w3.org" <public-script-coord@w3.org>
On Thu, Oct 3, 2013 at 12:33 PM, Mark S. Miller <erights@google.com> wrote: > You forgot to name the readonly one -- it specializes DOMRect by > guaranteeing that its instances not provide the ability to mutate the > underlying DOMRect. Given the other names, DOMRectReadOnly or DOMReadOnlyRec > (did you really mean to omit the "t"?) seem like fine names for the readonly > subtype. In Roc's explanation, the readonly one (you can't change the values, but something else might be able to) is the common superclass. As he argued, I'm pretty sure this satisfies LSP - an immutable class is a valid subclass of a readonly one (you lose nothing, and gain the ability to depend on the values staying constant), and a mutable class is also a valid subclass of a readonly one (again, you lose nothing, but you gain the abiilty to alter the values yourself). ~TJ
Received on Thursday, 3 October 2013 20:28:56 UTC