On Tuesday, 25 October 2022 at 14:53:50 UTC, Adam D Ruppe wrote:
On Tuesday, 25 October 2022 at 13:51:30 UTC, Andrey Zherikov
wrote:
A[] a = [A.init];
This is a problem - this is referring to a static array
instance, shared across all copies of B. You almost certainly
don't want this.
That B.a[0] is the *same object* across different
default-constructed Bs... unless the optimizer hits it or
something.
Is it a bad idea to trigger copy on write before modification of
B.a so it behaves as below?
```d
B b1;
b1.a = b1.a.dup; // copy on write
b1.a[0].i ~= '1';
b1.a ~= A.init;
b1.a[0].i ~= '2';
b1.a[1].i ~= '3';
b1.writeln; // B([A("12"), A("3")])
B b2;
b2.writeln; // B([A("")])
```
