• Tobias Pankrath (24/24) May 02 2021 The following code segfaults, when the outer hashmap rehashes,
• Imperatorn (5/30) May 02 2021 ```d
• Tobias Pankrath (3/8) May 02 2021 Is HashMap.init a broken state? That makes using them hard as
• Tobias Pankrath (3/7) May 02 2021 That only fixes it, because you are avoiding the rehash with the
• Tobias Pankrath (4/8) May 05 2021 I've figured it out and filed an PR

Tobias Pankrath <tobias+dlang pankrath.net> writes:

The following code segfaults, when the outer hashmap rehashes,
and I am not yet sure why.

```d
module tests.refcounted_hashmap_test;

import containers;
import std.typecons;

struct Map
{
     HashMap!(int, int) theMap;
}

unittest
{
     HashMap!(int, RefCounted!Map) mapOfMaps;
     foreach (i; 0 .. 1000)
     {
         RefCounted!Map val;
         if (i == 0) val.theMap.getOrAdd(i, i);
         mapOfMaps.getOrAdd(i, val);
     }
}
```

For your convenience: https://run.dlang.io/is/gHSlu1

I am using Refcounted() because HashMap itself is not copy-able. 
Is there another way to have HashMaps as values of HashMaps?

Imperatorn <johan_forsberg_86 hotmail.com> writes:

On Sunday, 2 May 2021 at 07:38:03 UTC, Tobias Pankrath wrote:
 The following code segfaults, when the outer hashmap rehashes,
 and I am not yet sure why.

 ```d
 module tests.refcounted_hashmap_test;

 import containers;
 import std.typecons;

 struct Map
 {
     HashMap!(int, int) theMap;
 }

 unittest
 {
     HashMap!(int, RefCounted!Map) mapOfMaps;
     foreach (i; 0 .. 1000)
     {
         RefCounted!Map val;
         if (i == 0) val.theMap.getOrAdd(i, i);
         mapOfMaps.getOrAdd(i, val);
     }
 }
 ```

 For your convenience: https://run.dlang.io/is/gHSlu1

 I am using Refcounted() because HashMap itself is not 
 copy-able. Is there another way to have HashMaps as values of 
 HashMaps?

```d
HashMap!(int, RefCounted!Map) mapOfMaps = HashMap!(int, 
RefCounted!Map)(1024);
```

Tobias Pankrath <tobias+dlang pankrath.net> writes:

On Sunday, 2 May 2021 at 08:59:15 UTC, Imperatorn wrote:
 On Sunday, 2 May 2021 at 07:38:03 UTC, Tobias Pankrath wrote:

 ```d
 HashMap!(int, RefCounted!Map) mapOfMaps = HashMap!(int, 
 RefCounted!Map)(1024);
 ```

Is HashMap.init a broken state? That makes using them hard as 
struct members :/

Tobias Pankrath <tobias+dlang pankrath.net> writes:

On Sunday, 2 May 2021 at 08:59:15 UTC, Imperatorn wrote:

 ```d
 HashMap!(int, RefCounted!Map) mapOfMaps = HashMap!(int, 
 RefCounted!Map)(1024);
 ```

That only fixes it, because you are avoiding the rehash with the
initial size.

Tobias Pankrath <tobias+dlang pankrath.net> writes:

On Sunday, 2 May 2021 at 07:38:03 UTC, Tobias Pankrath wrote:
 For your convenience: https://run.dlang.io/is/gHSlu1

 I am using Refcounted() because HashMap itself is not 
 copy-able. Is there another way to have HashMaps as values of 
 HashMaps?

I've figured it out and filed an PR 
https://github.com/dlang-community/containers/pull/169. Would be 
great if we can get a new version out with this.