Allocating Heap/GC Storage upon Default Construction of RC Containers
Andrei Alexandrescu via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Thu Sep 22 06:07:00 PDT 2016
On 9/21/16 8:49 AM, Nordlöw wrote:
> Is there any way to make a default constructor of a struct container
> allocate/initialize an internal pointer?
>
> I need this in a container with RC behaviour similar to
>
> struct Container
> {
> this() // this is currently forbidden:
> {
> _rcStore = emplace(cast(RCStore*)malloc(RCStore.size), null, 0);
> }
>
> private:
> static struct RCStore
> {
> T* store;
> size_t refCount;
> }
> RCStore* _rcStore;
> }
>
> If I can't modify default construction in containers such as `Container`
> it is gonna behave in the same confusing way as empty AA's do for
> (novel) D developers. Namely that the assignment of uninitialized AA's
> has copy semantics and non-empty AA's have reference semantics.
>
> I believe Andralex has spoken about this being a problem that should be
> fixed if possible.
Sadly, not currently. I realize this makes certain designs more
difficult. -- Andrei
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