Bypassing the postblit?

[Ritu]

Dear D Experts

I have a situation where I want to pass a D struct object as an 
argument to a function. Now in my case, I do not want to invoke 
the default D copy constructor for the struct. Is there a way of 
doing that? I have tried disabling the postblit and enabling 
another constructor via "alias this" (see the code below). But 
the compiler does not like that, and I get an error that tells me 
that the Bar is not copyable since it has been disabled:

struct Bar {
   @disable this(this);
   alias _foo this;
   Foo _foo;
   public this(Foo foo) {
     this._foo = foo;
   }
}

class Foo {}

void main() {
   Bar bar;
   Bar baz = bar;
}

Regards
Ritu