On May 27, 2008, at 5:14 PM, Scott Ribe wrote:
like C++ objects as member
variables of an ObjC object
This works fine if you set the right compiler options, which I think
has
been around since 10.3.
It requires both Mac OS X 10.4 and GCC 4, actually: There is
Objective-C runtime support that this feature needs, and that support
is only in Mac OS X 10.4 and only invoked if you're using GCC 4.0 or
later.
Also, keep in mind that under Objective-C garbage collection, your
objects may be cleaned up -- and therefore your C++ destructors run --
on an arbitrary non-main thread. If you're going to use C++ objects
as instance variables directly, you need to ensure that their
destructors are safe if you're also going to use garbage collection.
Finally, and just as an aside, Objective-C objects have instance
variables (as in Smalltalk) rather than member variables (as in C++).
This is somewhat important to keep straight because various parts of
the framework and runtime will actually use the term. For example,
the method +[NSObject accessInstanceVariablesDirectly] is used to
determine whether key-value coding will look into an object's instance
variables, or whether it will only call an objects property accessor/
mutator methods.
-- Chris
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