Getting the typeid of an object disguised under an interface

[Adam D. Ruppe via Digitalmars-d]

On Monday, 28 March 2016 at 17:40:15 UTC, Tomer Filiba wrote:
> yes, but it's used for logging exceptions. instead of doing the 
> to-string conversion in place, we just keep the raw pointers 
> and do addr2line on demand. so we're given an exception and 
> need to extract the bt from it

Perhaps you can set your own trace handler and either copy/paste 
code from druntime or just do your own backtrace() based thing:

http://dpldocs.info/experimental-docs/core.runtime.Runtime.traceHandler.1.html


Ugh, the druntime authors didn't actually document TraceHandler 
(it is listed as private, but that function obviously isn't). It 
is:

     alias Throwable.TraceInfo function( void* ptr ) TraceHandler;


The thing it passes is typically null. So you construct your own 
class fitting the TraceInfo interface and this is called when an 
exception is built.