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There are two (or three) errata in the Streams example
in C++NPv2 on p302.
When a module contains a member variable task that it
passes to its base class:
Given the following typedef:
typedef ACE_Module parent;
1. The base class default constructor must be used in
the constructor initialization list (i.e., don't put
anything in the constructor list, or put parent() to
be explicit about it), and then the base
class parent::open() function should be used in the
body of the derived module constructor to pass
the address of the member variable task.
This ensures that the member variable task has
finished construction before being passed to the
base class.
2. The derived module must implement a destructor,
and that destructor must call parent::close().
This removes any reference to the member
variable in the base class, and avoids a SEGV
when the base class destructor is closed.
3. A possible third errata is that the flag passed
to the base class tells the base class parent::close()
which task to delete. In the example, no tasks should
be deleted, so the flag should probably
be parent::M_DELETE_NONE.
Regards
Dave
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