Hi :),

What i thought was that when i create a struct dynamically i can just deconstruct it with __dtor lets say:

struct U {...}
struct S {... private U _member;}

S* p;
p = cast(S*)malloc(S.sizeof);

// just run that if it compiles, for simplicity
// we dont use __traits(compiles, ...)
p.__dtor;

The thing here is that this doesn't work because of when S has an element that that is private and has a __dtor itself, the __dtor from U doesnt get called before the call of __dtor from S - or after.

Is there any way with traits or sth to do that?

Are delete, destroy or any other functions the standard library working here?
I would prefer a solution that can be build by myself - so without the standard library for example with traits.

Thanks :)

On Wednesday, 21 February 2018 at 11:12:01 UTC, Jiyan wrote:
> Hi :),
>
> What i thought was that when i create a struct dynamically i can just deconstruct it with __dtor lets say:
>
> struct U {...}
> struct S {... private U _member;}
>
> S* p;
> p = cast(S*)malloc(S.sizeof);
>
> // just run that if it compiles, for simplicity
> // we dont use __traits(compiles, ...)
> p.__dtor;
>
> The thing here is that this doesn't work because of when S has an element that that is private and has a __dtor itself, the __dtor from U doesnt get called before the call of __dtor from S - or after.
>
> Is there any way with traits or sth to do that?
>
> Are delete, destroy or any other functions the standard library working here?
> I would prefer a solution that can be build by myself - so without the standard library for example with traits.
>
> Thanks :)

I think i found my solution: is it __xdtor? :P

Jiyan wrote:

> Hi :),
>
> What i thought was that when i create a struct dynamically i can just deconstruct it with __dtor lets say:
>
> struct U {...}
> struct S {... private U _member;}
>
> S* p;
> p = cast(S*)malloc(S.sizeof);
>
> // just run that if it compiles, for simplicity
> // we dont use __traits(compiles, ...)
> p.__dtor;
>
> The thing here is that this doesn't work because of when S has an element that that is private and has a __dtor itself, the __dtor from U doesnt get called before the call of __dtor from S - or after.
>
> Is there any way with traits or sth to do that?
>
> Are delete, destroy or any other functions the standard library working here?
> I would prefer a solution that can be build by myself - so without the standard library for example with traits.
>
> Thanks :)

`p.destroy` will call the dtors for you. you'd better not use `__`-frefixed symbols yourself, as they aren't actually a part of a language, they're just
implementation details.

On Wednesday, 21 February 2018 at 12:07:47 UTC, ketmar wrote:
> `p.destroy` will call the dtors for you.

So it is the same function but I prefer to always write it:

.destroy(p);

yes, a leading dot. This ensures you call the top-level destroy function instead of any members which may not do the same thing.

On 2/21/18 6:24 AM, Jiyan wrote:
> I think i found my solution: is it __xdtor? :P

Yes, that is the function that will run *recursively* all the destructors (just __dtor runs the destructor method if you provided one). But I'd recommend as the others did, using destroy.

-Steve