[C++-sig] test if object instance is instance of extension class in C++

[Stefan Seefeld]

On 02/24/2012 09:33 AM, Holger Joukl wrote:
> bp::object itself has reference (smart pointer) semantics, so there is
> no need to pass objects by reference.
> I see. Just out of curiosity:
> If I pass by reference I do save a copy constructor call, don't I?

In principle, yes. I'm not sure how much of this the compiler would be
able to optimize away, though.

> But I circumvent the bp::object refcount safety, though(?).

Well, yes, but you don't need that as C++ language semantics ensure the
object lifetime.

> But in a type check like above this shouldn't be dangerous - right?

There is definitely no danger in doing this. It may just add a little
bit of overhead (since in certain cases passing by value is cheaper than
passing by reference, depending on the involved types and optimization
level.

    Stefan


-- 

      ...ich hab' noch einen Koffer in Berlin...