Problem Benchmarking HashSet from containers-em

[Justin Whear via Digitalmars-d-learn]

On Thu, 22 Oct 2015 19:41:08 +0000, Nordlöw wrote:

> My existing call to
> 
>      auto set = HashSet!(E, Allocator)();
> 
> works for Mallocator as in
> 
> https://github.com/nordlow/justd/blob/master/containers_ex.d#L17
> 
> but not for
> 
>      InSituRegion!(1024*1024, T.alignof)
> 
> Why? Please, help.

The HashSet defines different constructors based on the nature of tha allocator:
https://github.com/economicmodeling/containers/blob/master/src/containers/hashset.d#L30

Specifically, if the allocator has zero state (like Mallocator), you do not pass an instance.  If the allocator does have state, like InSituRegion, you need to pass an instance to the container's constructor.