"John D" <jd...@googling.com> wrote in message news:hk0mph$2dt...@digitalmars.com... > > "Andrei Alexandrescu" <seewebsiteforem...@erdani.org> wrote in message > news:hjo75f$2g3...@digitalmars.com... >> Nick Sabalausky wrote: >>> >>> Still within the context of this D BigInt example, what benefit does >>> using a factory method provide over a throwing constructor? >>> >>> I've always seen factories as falling into one of two categories: 1. A >>> hack to get around a limitation in a language's constructor feature. or >>> 2. Part of a helper API (I guess the kids are calling those "facades" >>> these days...) for pre-configuring a new instance in a commonly-useful, >>> but non-default way. >> >> Factories are mostly (imho) important in the fourth scenario: when you >> want to create an object from data. >> > > I vote for #3: Factories are most important for getting interfaces out of > dynamic libraries.
Can you elaborate on this?
