On Thu, Jun 10, 2021 at 4:34 PM Larry Garfield <la...@garfieldtech.com> wrote:
> On Thu, Jun 10, 2021, at 3:17 AM, Guilliam Xavier wrote: > > On Wed, Jun 2, 2021 at 7:47 PM Larry Garfield <la...@garfieldtech.com> > > wrote: > > > > > https://wiki.php.net/rfc/partial_function_application > > > > for `$null === null`, is `$c = $null->bar(?);` / `$c = > > $null::baz(?);` an immediate error, or only later when calling > `$c($arg)`? > > That dies with "call to member function on null" when trying to create the > partial: > > https://3v4l.org/E6MgK/rfc#focus=rfc.partials > That makes sense (eager evaluation of non-placeholder "arguments", including the called-on object). > > does it > > support nullsafe calls, e.g. `$foo?->bar(?)`? and if yes, what is the > > signature of the Closure when `$foo === null`? > > I just checked, and it... sort of supports nullsafe. Rather, if you try > to partial a method on a null object, you get null back for your closure. > Then when you try to call it, you get a "cannot invoke null" error. > Which... I think makes sense. > > cf: https://3v4l.org/4XeB3/rfc#focus=rfc.partials Well I find that unexpected :/ > As a cute side effect, Joe pointed out you could do this: > > https://3v4l.org/ERRdY/rfc#focus=rfc.partials So there's a "workaround", although I wouldn't call it precisely "cute"... > I wouldn't really call that a feature, but more of a side effect of the > implementation. Please don't count on that behavior. > I'd rather not indeed ;) Since `$null?->whatever(1, 'a')` currently always returns null without error, shouldn't `$null?->whatever(?, 'a')` return a closure (with a signature built from the placeholders only) that will return null when called (i.e. equivalent to `fn (mixed $arg1) => null` here)? Thanks, -- Guilliam Xavier
