On Thursday, 26 July 2018 at 12:53:44 UTC, rikki cattermole wrote:
On 27/07/2018 12:45 AM, Johan Engelen wrote:
In D, we don't have placement new, great! And now, I learn
that the _standard library_ _does_ have something that looks
like placement new, but without extra guarantees of the spec
that C++ has.
For some more info:
https://stackoverflow.com/a/49569305
https://stackoverflow.com/a/48164192
- Johan
Both of those links is related to structs not classes (and
original post is about classes).
Given the content (I could be wrong) but I don't think its
related to our situation in D.
Uhm, this has everything to do with our situation in D and with
classes in D too. The links are of course about classes with and
without vtable.
Classes in D are very "heavy" with their explicit vtable. Given
that classes in C++ can act as a value and a reference type,
you have to be pretty careful when comparing them.
I'd appreciate it if you reread and think more about it. D's
classes and C++'s structs/classes are the same in what is
discussed here, and vtable is just one of the issues.
-Johan
