Any way to tell if an object is inside another class?

Steven Schveighoffer schveiguy at
Mon Sep 28 15:51:22 UTC 2020

On 9/28/20 7:11 AM, Ruby The Roobster wrote:
> For example:
> class test {}
> class T {
> auto c = new test();
> }
> Any way to tell if an object of type test is a member of object T? I 
> don't want to use the name of the member variable. I just want to know 
> if this works in general.
> Why am I asking this? Because I need it to develop this Multiple Alias 
> This project I am working on(basically just mashing all the functions 
> into a class and then using the class with alias this)

No. The type of e.g. T.c is the same as the type of some other instance 
of `test`.

Armed only with a class reference to a `test` object, you cannot tell 
where it is referenced from.

I think you need to be more specific about what you want to do. I have a 
feeling you are not understanding how classes work in D (they are not 
stored inside an object or struct, but rather on the heap, and the 
member variable is simply a reference to that item).


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