On Friday, 30 August 2019 at 13:43:54 UTC, XavierAP wrote:
On Thursday, 29 August 2019 at 10:11:58 UTC, berni wrote:
Iterating of some structure and removing elements thereby is
always errorprone and should be avoided. But: In case of AA,
I've got the feeling, that it might be safe:
foreach (k,v;ways)
if (v.empty)
ways.remove(k);
Do you agree? Or is there a better way to achieve this?
It compiles and it runs without throwing any RangeError... So
it appears to be safe. Otherwise it'd be a bug that there's not
error.
Whether you actually get an error at runtime depends on the load
factor of the AA. If it drops below a certain threshold, the AA
will be resized [1], and its original memory will be freed [2].
[1]
https://github.com/dlang/druntime/blob/master/src/rt/aaA.d#L631
[2]
https://github.com/dlang/druntime/blob/master/src/rt/aaA.d#L154
