Re: RFC - Immutable classes

@Christoph I get the nostalgia :) I think that *zend_compare_symbol_tables* compares only hash tables whether they contain same properties regardless of the values. 2016-09-07 20:44 GMT+02:00 Silvio Marijić <marijic.silvio@gmail.com>: > @Fleshgrinder > > I will make changes that if immutable objects are being compared that they > will be compared by value rather then hash > On Sep 7, 2016 8:27 PM, "Christoph M. Becker" <cmbecker69@gmx.de> wrote: > >> On 07.09.2016 at 20:11, Fleshgrinder wrote: >> >> > On 9/7/2016 8:57 AM, Michał Brzuchalski wrote: >> > >> >> AFAIK CoW in case of objects would be impossible to implement. >> > >> > Nothing is impossible. :) >> > >> > We have full access to the real object inside of zend_std_write_property >> > and can easily clone it, perform the desired changes and return without >> > affecting anyone. >> > >> > I am not 100% sure how to do this without fiddling around a bit. >> > >> > @nikic and @afaults: I am really sorry to bother you both but you guys >> > simply know the PHP source endlessly good. What do you think, would it >> > be possible to implement copy-on-write for an object as we have it with >> > our scalar and compound types? >> > >> > final class A { >> > public $p; >> > } >> > >> > $a = new A; >> > $b = $a; >> > >> > var_dump($a === $b); // bool(true) >> > >> > $b->p = 1; >> > >> > var_dump($a === $b); // bool(false) >> > >> > It's only about writing to existing properties. >> >> Ah, good old PHP 4, see >> <https://3v4l.org/VaD1W#v5328>. :-) >> >> -- >> Christoph M. Becker >> >> -- Silvio Marijić Software Engineer 2e Systems