Re: Initialization and deinitialization order

From:

Victor Bazarov <v.bazarov@comcast.invalid>

Newsgroups:

comp.lang.c++

Date:

Thu, 18 Aug 2011 16:57:54 -0400

Message-ID:

<j2jucj$ls4$1@dont-email.me>

On 8/18/2011 3:06 PM, Christopher wrote:

Another question on the topic is: What is the order on construction
for multiple inheritace?

The order of constructing the subobjects of base classes corresponds to
the order of their declaration.

I've found a description for single inheritance that goes like this:

1. Memory for derived object is set aside (enough for both the base
and derived portions).
2. The appropriate derived constructor is called.
3. The base object is constructed using the appropriate base
constructor.
4. The derived initialization list initializes variables.

... or it doesn't. The order of their initialization is defined by the
order of their declaration in the class definition.

5. The body of the derived constructor executes.
6. Control is returned to the caller.

Is there an order of which object is constucted first if A is derived
from B and C?

Yes, if A derives from B and C, first the B subobject is constructed,
then the C one.

What if A is derived from B and C, while B and C are both derived from
D?

Depends on whether D is virtual base or not. If it's a virtual base,
then it's constructed first, then B and then C. If not, each B and C
constructor will construct their own Ds.

V
--
I do not respond to top-posted replies, please don't ask