Distinguishing a pointer to a function and a closure

[Adam D. Ruppe]

On Monday, 11 November 2019 at 13:10:44 UTC, berni44 wrote:
> (a normal delegate seems to be an Object somehow, though).

The .ptr method is a pointer to the data associated with the 
delegate. It might be an object (class or struct) or it might be 
a memory block (for local variables  on the stack or a closure).

There is no way to tell the difference between these in D, even 
at runtime. The .ptr member drops all source information.

The code should probably be rewritten to avoid inspecting the 
.ptr member entirely. Maybe have it wrap the function internally 
- right at the point when it receives the delegate or write a 
whole new function that takes object and method separately - or 
something.