Hi All,

What's the best way to do this in D?

E.g.

---
struct O
{
  int* value;
  @disable this(this);
/+
  this()
  {
    this.value = theAllocator.make!int(99);
  }
+/
  ~this()
  {
    theAllocator.dispose(this.value);
  }
}

O obj = O(); // Ideally this would be allocated but it simply run O.init
---

Thanks
Norm

On Tuesday, 27 March 2018 at 02:35:23 UTC, Norm wrote:
> What's the best way to do this in D?

I'd also add `@disable this();` and then a `static O make() { return O(theAllocator.make!int(99)); }`

than you construct it with that static make function.

On Tuesday, 27 March 2018 at 02:43:15 UTC, Adam D. Ruppe wrote:
> On Tuesday, 27 March 2018 at 02:35:23 UTC, Norm wrote:
>> What's the best way to do this in D?
>
> I'd also add `@disable this();` and then a `static O make() { return O(theAllocator.make!int(99)); }`
>
> than you construct it with that static make function.

Perfect, thanks.

On Tuesday, 27 March 2018 at 02:43:15 UTC, Adam D. Ruppe wrote:
> On Tuesday, 27 March 2018 at 02:35:23 UTC, Norm wrote:
>> What's the best way to do this in D?
>
> I'd also add `@disable this();` and then a `static O make() { return O(theAllocator.make!int(99)); }`
>
> than you construct it with that static make function.

OK, that got me over the first hurdle but I still cannot use RAII with struct member vars. E.g.

---
struct Resource {
  this() {allocate_something();}
  ~this() {release_something();}
}

struct S {
  Resource resource;
}

---

Is there a way to do this in D, or does it require special "create" functions for every struct that has a RAII-like struct as a member?


Thanks,
Norm

On Thursday, 29 March 2018 at 04:12:38 UTC, Norm wrote:
> Is there a way to do this in D, or does it require special "create" functions for every struct that has a RAII-like struct as a member?

You'll have to do it all the way up (unless you can use a constructor with an argument and call that instead)

On Thursday, 29 March 2018 at 04:16:55 UTC, Adam D. Ruppe wrote:
> On Thursday, 29 March 2018 at 04:12:38 UTC, Norm wrote:
>> Is there a way to do this in D, or does it require special "create" functions for every struct that has a RAII-like struct as a member?
>
> You'll have to do it all the way up (unless you can use a constructor with an argument and call that instead)

OK, thanks.