Re: Proposal fo "Code-free constructors declaration"

On Fri, 25 Jan 2019 at 11:05, Nikita Popov <nikita.ppv@gmail.com> wrote: > class Point { > public int $x; > public int $y; > public int $z; > } > > // (syntax just a dummy) > $origin = new Point { x = 0, y = 0, z = 0 }; > > Where the object initialization syntax ensures that all properties that > don't have defaults are initialized. Especially now that we have typed > properties and it is feasible to have data objects with just public typed > properties, I think that this is the way to avoid ctor boilerplate, rather > than making it simpler to write that boilerplate. > The big difference here is that you are making the short-hand the responsibility of the caller, rather than the definer. I suspect there's a Venn diagram of use cases where the two features would be useful. In particular, the call-site syntax you have there would work really well for a value type, and could go with having full support for that (e.g. have the resulting object be immutable / copy-on-write); it works less well for something like dependency injection, where the properties would normally be private, and you might want to combine the short-hand with some normal constructor logic. Regards, -- Rowan Collins [IMSoP]