Any chance to avoid monitor field in my class?

[Daniel Murphy via Digitalmars-d-learn]

"Yuriy"  wrote in message news:uflaemdlxvavfmvkbudq at forum.dlang.org... 

> Hello, is there a way of reducing size of an empty class to just 
> vtbl? I tried to declare it as extern(C++) which works, but has a 
> nasty side effect of limited mangling.

What exactly is the mangling problem with extern(C++) classes?