Template trouble
Template trouble
- Subject: Template trouble
- From: "Edward K. Chew" <email@hidden>
- Date: Mon, 28 Aug 2006 15:29:09 -0400
I have been running into a lot of runtime problems bringing a
CodeWarrior C++ project over to Xcode. The most problematic classes
seem to be those where I have a base class with some virtual methods
and a class template deriving from it. If the template object calls
on a base class method which, in turn, calls a virtual method
implemented back in the template, the Xcode executable sometimes
drops the ball and can't find the right virtual method. (The method
dispatch table, when gdb lets me see it, seems to have an unusually
low address in those instances, and may be pointing to unmapped
memory?) This has never occurred in CodeWarrior, and what is
frustrating is that the behaviour in Xcode can be unpredictable and
difficult to reproduce.
For example, I can simply declare a template object somewhere in
main.cp and it messes up the initialization of another object in
another source. The test variable need not use the same template
data type, nor does it even need to be created before the other one
gets initialized. I can't imagine how the one could possibly be
affecting the other, but I'm beginning to think something weird is
going on at link time.
I have also run into problems with STL objects, usually when they are
nested (e.g. a map where each data element is itself a list or a
vector). The iterators seem get lost from time to time.
Unfortunately, I have yet to succeed in coming up with a simple
example which replicates the behaviour. I was wondering if others
have been having these sorts of problems, or if anyone can offer some
advice on what I can check next?
-Ted
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