Who's using structs nested in functions?

[Denis Koroskin]

On Thu, 22 Oct 2009 18:07:15 +0400, Andrei Alexandrescu  
<SeeWebsiteForEmail at erdani.org> wrote:

> Refer to:
>
> http://www.digitalmars.com/d/2.0/struct.html
>
> and scroll down to the last section, "Nested Structs". A struct defined  
> inside a function has a hidden pointer to that function's stack frame  
> and therefore can use function's local variables.
>
> Nested classes do a similar trick, but for those there's a bit of  
> motivation - you could create a nested class and use it as a sort of  
> closure by returning a base class or interface of it.
>
> With nested structs, however, you can't do much. You can pass them to a  
> template, but I can't see some solid use cases there. My understanding  
> is that nested structs have been implemented for completeness and  
> consistency with nested classes.
>
> Any good example of nested struct uses?
>
>
> Andrei

Everything you can do with nested struct is doable with a nested class as  
well (marking methods as final, using scope to allocate instance on stack  
etc). I don't think there's anything specific to nested struct. One thing  
I can think of is that you are using some template that works with structs  
only, but then you may create a nested class and nest a static struct  
inside it (not that I would recommend doing so but still) :)