How to delete element from array container or dlist?

[Jamie]

On Sunday, 18 March 2018 at 16:14:06 UTC, Michael wrote:
> On Sunday, 18 March 2018 at 15:42:18 UTC, Andrey Kabylin wrote:
>> On Sunday, 18 March 2018 at 15:32:47 UTC, Michael wrote:
>>> On Sunday, 18 March 2018 at 14:58:52 UTC, Andrey Kabylin 
>>> wrote:
>>>> In DList we have method remove, but I can't understand how 
>>>> this method works, I want write somethink like this:
>>>>> void unsubscribe(EventsSubscriber subscriber) {
>>>>>     subscribers.remove(subscriber);
>>>>> }
>>>
>>> So I guess you would want something like
>>>
>>> subscribers.remove!(a => a == subscriber));
>>>
>>> which is the different definition of remove available here:
>>> https://dlang.org/phobos/std_algorithm_mutation.html#.remove.2
>>
>> Yes this works, thanks!
>
> No problem, glad to help!

Just an FYI:
This didn't work as I expected -- the length of subscribers 
didn't change. What I needed here was
subscribers = subscribers.remove!(a => a == subscriber));

Otherwise this sort of behaviour resulted:
// code:
struct A {int i;}
A[] as = [A(1), A(2), A(3)];
writeln("as = ", as);
writeln(remove!(a => a == A(2))(as));
writeln("as = ", as);
writeln(remove!(a => a == A(3))(as));
writeln("as = ", as);

// output:
as = [A(1), A(2), A(3)]
[A(1), A(3)]
as = [A(1), A(3), A(3)]
[A(1)]
as = [A(1), A(3), A(3)]